Shortcut: WD:PP/SCI

# Wikidata:Property proposal/Natural science

Wikidata:Property proposal/Pending - Properties which have been approved but which are on hold waiting for the appropriate datatype to be made available.
Wikidata:Properties for deletion - proposals for the deletion of properties.

 Before proposing a property Check if the property already exists by looking at Wikidata:List of properties (manual list) and Special:AllPages. Check if the property is already pending or has been rejected. Check if you can give a similar label and definition as an existing Wikipedia infobox parameter, or if it can be matched to an infobox, to or from which data can be transferred automatically. See WD:WikiProject Infoboxes for suggestions. Select the right datatype for the Property. Start writing the documentation based on the preload form below and add it in the appropriate section. Creating the property Creation can be done after 1 week by a property creator or an administrator. See steps when creating properties. Add a request

To add a request, you should use this form:

=== {{TranslateThis | anchor = en
| en = PROPERTY NAME IN ENGLISH
| de = <!-- PROPERTY NAME IN German (optional) -->
| fr = <!-- PROPERTY NAME IN French (optional) -->
<!-- |xx = property names in some other languages -->
}} ===
{{Property documentation
|status                 = <!--leave this empty-->
|description            = {{TranslateThis
| en = ...
}}
|subject item           = <!-- item corresponding to the concept represented by the property, if applicable; example: item ORCID (Q51044) for property ORCID (P496) -->
|infobox parameter      = Wikipedia infobox parameters, if any; ex: "population" in [[:en:template:infobox settlement]]
|datatype               = put datatype here (item, string, media, coordinate, monolingual text, multilingual text, time, URL, number)
|domain                 = types of items that may bear this property
|allowed values         = type of linked items (Q template or text), list or range of allowed values, string pattern...
|source                 = external reference, Wikipedia list article, etc.
|example                = {{Q|1}} → {{Q|2}}
|formatter URL          =
|filter                 = (sample: 7 digit number can be validated with edit filter [[Special:AbuseFilter/17]])
|robot and gadget jobs  = Should or are bots or gadgets doing any task with this? (Checking other properties for consistency, collecting data, etc.)
}}

;Motivation

;{{int:Talk}}


For a list of infobox parameters, you might want to use table format:

{{List of properties/Header}}

{{List of properties/Row|id=
|title          = audio
|type           = media
|qualifier      =
|description    = Commons sound file
|example-subject= Q187 <!-- Il Canto degli Italiani -->
|example-object = Inno di Mameli instrumental.ogg
}}

</table>


For blank forms, see Property documentation and List of properties/Row

## Biology / Biologie / Biologie

See also Wikidata:Property proposal/Pending for approved items awaiting the deployment of currently unavailable datatypes

### Dyntaxa ID

Done: P1939
Dyntaxa ID
Swedish Taxonomic Database ID
Represents Q20425914 String Taxa number Caeciliusidae → 2000976 https://www.dyntaxa.se/taxon/info/$1 Probably GZWDer (talk) Discussion (Add your motivation for this property here.) GZWDer (talk) 15:38, 28 January 2015 (UTC) Could you give more detail? I looked at this site, http://www.slu.se/sv/centrumbildningar-och-projekt/artdatabanken/, but a quick look leaves me mystified. A look at https://www.dyntaxa.se/taxon/info/2000976 shows only a barebones skeleton. - Brya (talk) 17:40, 28 January 2015 (UTC) GZWDer: Any remarks? --Succu (talk) 22:07, 10 February 2015 (UTC) See sv:Mall:Dyntaxa, but it is used in few pages.--GZWDer (talk) 01:05, 11 February 2015 (UTC) I am dubious as 1) this does not appear to have original information, but is just a gathering of material from elsewhere and 2) this is a local database (this is also the case for the two proposals below), so this would start a trend to have a database for every country (and there are many countries). - Brya (talk) 05:00, 11 February 2015 (UTC) • Support I am still less than enthusiastic, but it is better than GBIF and the like, so it would not hurt. - Brya (talk) 05:23, 3 June 2015 (UTC) • OK, let's do it. Dyntaxa is used by GBIF, WoRMS has links. I'm prepared to add these IDs. Support --Succu (talk) 09:51, 8 June 2015 (UTC) • @GZWDer: Please provdie an English-language descritpion. Andy Mabbett (Pigsonthewing); Talk to Andy; Andy's edits 09:15, 11 June 2015 (UTC) I used google translate. MSGJ (talk) 14:43, 11 June 2015 (UTC) • Done MSGJ (talk) 20:05, 11 June 2015 (UTC) ### type is held by Not done Description The institution or collection which houses the type specimen/illustration of a scientific name (of a taxon) Item n/a taxon names Ichthyosaurus anningae (Q19346236) => Doncaster Museum (Q5295507) scientific literature/databases (etc) Andy Mabbett (Pigsonthewing); Talk to Andy; Andy's edits Discussion -- Andy Mabbett (Pigsonthewing); Talk to Andy; Andy's edits 16:24, 22 February 2015 (UTC) Why restrict to holotype (Q1061403)? --Succu (talk) 16:45, 22 February 2015 (UTC) Yes, that is a good question: the normal thing would be "type" (nomenclatural type). BTW: why in French? Why disregard databases? Perhaps we should do "type locality" first, as there are quite a few Wikipedia pages already reporting that. - Brya (talk) 17:28, 22 February 2015 (UTC) "French"? "disregard databases"? Andy Mabbett (Pigsonthewing); Talk to Andy; Andy's edits 21:01, 22 February 2015 (UTC) Well, "taxons" is French for "taxa". And I imagine there are more sources for this information, in particular databases. And I don't see a reason for separate properties, or qualifiers, for the several kinds of types. There (usually) is only one type, and it is in only one place, and to that location it is irrelevant what the nature of the type is. It would make more sense to have a property "nomenclatural type" referring to a type specimen (or illustration) and attach a qualifier to that, to indicate the nature of the type. But location of the type is pretty far down the list of properties I would want. I would rather have a property indicating the gender of a generic name, or indicating if a specific name/epithet is a noun or adjective. Type locality looks more desirable as well. Or, if there is interest in types, a direct link to a picture of the type (there are tens of thousands of these available). - Brya (talk) 05:40, 23 February 2015 (UTC) You are of course welcome to propose any additional properties you see fit; we're hardly likely to run out of space for them. The term "Taxons" is in the pro-forma proposal template; I'm not aware that the source parameter is required to be exhaustive. I wonder how you would distinguish Paratype (Q926578), Syntype (Q719822), and allotypes, from holotypes? Andy Mabbett (Pigsonthewing); Talk to Andy; Andy's edits 12:39, 23 February 2015 (UTC) Paratypes, syntypes and allotypes are not really an issue: they are not types, but terms having "type" in the term indicating them (there are a lot such terms). Actually, syntypes are odd, they are not types under the ICNafp, but they are (more or less) under the ICZN. However, the moment a serious taxonomist looks at them they stop being types. - Brya (talk) 17:25, 23 February 2015 (UTC) I'm not averse to having a single "type specimen" (or whatever it might be called) property, if that's what "serous taxonomists" advise. Andy Mabbett (Pigsonthewing); Talk to Andy; Andy's edits 21:09, 23 February 2015 (UTC) We could have another property for other type(s) or have one and add a qualifier, I suppose. Andy Mabbett (Pigsonthewing); Talk to Andy; Andy's edits 21:01, 22 February 2015 (UTC) Neutral: I suppose it would not hurt to have this, but I don't see it has any priority. If we would have links to type specimens, this would become mostly superfluous. - Brya (talk) 06:00, 24 February 2015 (UTC) type is held by is superfluous. We can model this allready: 1. Create a new item, name it DONMG:1983.98, 2. add collection (P195) = Doncaster Museum (Q5295507), 3. add instance of (P31) = type specimen (Q3546082), 4. add taxonomic type (P427) = DONMG:1983.98 to the taxon item. What we need is a property for the type status. And we need a clear understandung how to model a Specimen or Taxon Occurrence. The new created item DONMG:1983.98 could have a bunch of other usefull information eg: • catalog number • collector • collecting date • geolocation • type for taxonname • sex • ... -- Succu (talk) 12:26, 24 February 2015 (UTC) I assume the taxonomic type (P427) = DONMG:1983.98 and perhaps the collection (P195) = Doncaster Museum (Q5295507) (a qualifier?) would be added to the taxon item. Well yes, I suppose this is possible. It would also be possible to give every specimen ever collected its own item. Given that we have some 1.9 million taxon names we could have some 1.8 million items for type specimens/illustrations. However, it looks like an immense amount of effort for only a small gain in the amount of information. Who would really want to know this? There has been only a small start in eliminating completely fictitious taxa, so data quality is far from guaranteed in what data now is present. And I imagine there are other properties to add that would be more interesting to the user of data. - Brya (talk) 17:31, 24 February 2015 (UTC) We have a little bit more than 500 usages of taxonomic type (P427). I do not expect a great incease using type speciemens in the near future. But we have c:Category:Type specimens too. So if someone is interested s/he could work on these. If Andy Mabbett agrees I would remodel this proposal into one for type status. --Succu (talk) 18:34, 24 February 2015 (UTC) BTW: Europeana (Q234110) has more than 75,000 images of type specimens. We can link to them via Europeana ID (P727). --Succu (talk) 18:56, 24 February 2015 (UTC) Five hundred usages of taxonomic type (P427) is indeed very little, especially given how commonly this is included on Wikipedia's. What do you mean by "type status"? The link to Europeana (Q234110) does not lead to type specimens (there are four specimens of Schotia africana on the first page). Typing in "holotype" gives 16 results. - Brya (talk) 19:39, 24 February 2015 (UTC) type status - or however we name that property - should provide the „type of the type” eg holotype (Q1061403), lectotype (Q2439719)... --Succu (talk) 21:06, 24 February 2015 (UTC) Oh yes, that. As pointed out above we will indeed need that, as a qualifier, once we have some kind of property/structure to handle type specimens. Something like "nature of type" ("kind of type"?) looks better to me; they have the status of "name-bearing type" or "nomenclature type". - Brya (talk) 05:55, 25 February 2015 (UTC) I gave it a second thought and came to the conclusion that we don't need a new property. Have a look at the value of taxonomic type (P427) in Ichthyosaurus anningae (Q19346236), Acanthocalycium ferrarii (Q337692) (holotypes) and Cereus hexagonus (Q1055079) (an illustration as lectotype). instance of (P31) should do the job. --Succu (talk) 15:03, 25 February 2015 (UTC) That would work, in principle. It will then be convenient to have an "is the type of" property. -Brya (talk) 18:40, 25 February 2015 (UTC) Yep. That's the one we need. --Succu (talk) 18:43, 25 February 2015 (UTC) However, misuse seems likely. It would be appropriate for a type specimen to have "is the type of" and for an animal it would be appropriate for a type species to have "is the type of", but for a plant species it would not be appropriate to have "is the type of". - Brya (talk) 18:58, 25 February 2015 (UTC) Sry, but I do not catch your point. A type specimen acting as a nomenclature type should be linked to the taxon item. Otherwise it might be got lost. --Succu (talk) 19:45, 25 February 2015 (UTC) There is a big difference between the ICZN and the ICNafp: Under the ICZN the type of a family is a type genus, under the ICNafp the type of a family is a specimen (or illustration), and it may be indicated by referring to a type genus (the "type genus" is only an indication, not a type). Thus, there is an asymmetrical relationship (even under the ICZN there is a degree of asymmetry: a single type genus can be the type for a tribe, a subfamily, a family, a superfamily, etc) . - Brya (talk) 06:54, 26 February 2015 (UTC) We found a better solution (see above discussion): Oppose --Succu (talk) 15:28, 26 February 2015 (UTC) ### conifers.org ID Done: P1940 conifers.org ID string that identifies a page in the conifers.org website Description string that identifies a page in the conifers.org website Gymnosperm Database String taxon names Araucaria bidwillii → ar/Araucaria_bidwillii http://conifers.org/$1.php user:Brya
Discussion

useful website, not top quality (and with incomplete coverage), but still with a lot of useful information. - Brya (talk) 11:12, 5 May 2015 (UTC)

• Not very complete, but why not.  Support --Succu (talk) 15:11, 9 May 2015 (UTC)
• I think we should perhaps be string stings like "Austrotaxus", not "ta/Austrotaxus". Andy Mabbett (Pigsonthewing); Talk to Andy; Andy's edits 10:21, 10 May 2015 (UTC)
Maybe such strings would be better, but this is a suggestion that should be made to the owner of the conifers.org website. He is not using them now, and without them we cannot make a link. - Brya (talk) 11:06, 22 May 2015 (UTC)
•  Done MSGJ (talk) 20:32, 11 June 2015 (UTC)

## Chemistry / Chemie / Chimie / Химия

### PGCH ID

Done: P1931
PGCH ID
Identifier for a chemical in the NIOSH Pocket Guide to Chemical Hazards
Description Identifier for a chemical in the NIOSH Pocket Guide to Chemical Hazards Pocket Guide to Chemical Hazards String chemical substance (Q79529) 4-digit identifier acetone → 0004 http://www.cdc.gov/niosh/npg http://www.cdc.gov/niosh/npg/npgd1.html Notified participants of Wikiproject Chemistry, Motivation This is a widely used identifier for hazardous chemicals in the United States. Emily Temple-Wood (NIOSH) (talk) 18:42, 1 June 2015 (UTC) • Support Quite important ID but the main use seems to be a reference for exposure and safety data. Snipre (talk) 09:55, 2 June 2015 (UTC) • Support. Filceolaire (talk) 08:43, 3 June 2015 (UTC) @Emily Temple-Wood (NIOSH), Snipre, Filceolaire: Done PGCH ID (P1931) Andy Mabbett (Pigsonthewing); Talk to Andy; Andy's edits 07:58, 10 June 2015 (UTC) ### Decomposition point In progress Description decomposition point of a substance Number pl:Szablon:Związek chemiczny infobox, ru:Шаблон:Вещество chemical substance (Q79529) copper(II) acetylide (Q9138794) → 100 °C (with remark explosively) [from: CRC Handbook of Chemistry and Physics (Q904273), 90th] gold(III) chloride (Q174129) → >160 °C [from: CRC Handbook of Chemistry and Physics (Q904273), 90th] possible remarks to indicate pressure and like explosively, violently scientific literature (eg. CRC Handbook of Chemistry and Physics (Q904273)) Motivation Annotation from Wikidata:WikiProject Chemistry/Properties made by user:Michał Sobkowski: "Decomposition is usually indicated in m.p. or b.p. records (as is proposed here, see above). However, it is not necessarily coincided with these values. Decomposition may take place without phase transition, e.g. in gas phase; an observed "boiling point" may be just decomposition into volatile product(s) without reaching the real b.p. of a substance; the phase of a decomposing substance may not be known. Thus, instead of adding unprecise remarks to the m.p./b.p.'s (which are reasonable only in printed material, to save place), an additional field assigned exclusively for this value would be advantageous." ∼Wostr (talk) 18:20, 12 June 2015 (UTC) Discussion • Support But we have to be able to specify an interval. Snipre (talk) 19:35, 12 June 2015 (UTC) • Support Of course this will have to have constraints; preferably I would like to see the temperature in kelvins and this cannot be applied to elements (compounds only).--Jasper Deng (talk) 01:06, 13 June 2015 (UTC) ### Uncertainty In progress Description Statistical uncertainty Number tbc Freebase Freebase import Motivation To be used as a qualifier. Needed to import https://www.freebase.com/chemistry/atomic_mass/uncertainty Andy Mabbett (Pigsonthewing); Talk to Andy; Andy's edits 13:05, 18 June 2015 (UTC) Discussion @Pigsonthewing: The Freebase link does not work for me at the moment, so I can't look at the exmaple. I think the proposal needs a more general discussion on how things like this should be handled. The measure is meaningless without knowing (1) how it was calculated and (2) what the calculated uncertainty is (3) if it is given as a fraction, percentage or in absolute values. For example en:Copernicium even has an asymmetric uncertainty: 357 (+112/−108)K given in the absolute measure and the mode of calculation should be mentioned in the source. I am not sure the number-datatype can handle this complexity. We need some kind of datatype that gives us a few fields for all these values. For example Uncertainty: (Field 1: +Uncertainty)[Number], (Field 2: -Uncertainty, Optional: only use when asymmetric)[Number], (Field 3: Relative, Absolute)[Item], (Field 4: Mode of Calculation)[Item]. --Tobias1984 (talk) 13:24, 18 June 2015 (UTC) Link works for me (you need to select the "instances" tab for example values). Andy Mabbett (Pigsonthewing); Talk to Andy; Andy's edits 13:26, 18 June 2015 (UTC) Oppose Should be part of a global concept for uncertainty because uncertainty is not only one value. Snipre (talk) 12:58, 22 June 2015 (UTC) +1 Oppose --Succu (talk) 21:51, 26 June 2015 (UTC) Support Scientific data will stay a minority here. The general concept (± operator) is enough for the moment.--Kopiersperre (talk) 17:28, 27 June 2015 (UTC) We will have tons of scientific data here in the future. But this should be done with datatype quantity. --Succu (talk) ### Periodic table block In progress Description The section of the periodic table to which an element belongs periodic table block (Q193099) Item |block= in en:Template:Infobox element chemical elements Instances of periodic table block (Q193099) oxygen (Q629) → p-block (Q214483) Freebase Freebase import Motivation Needed to import https://www.freebase.com/chemistry/chemical_element/periodic_table_block Andy Mabbett (Pigsonthewing); Talk to Andy; Andy's edits 13:20, 18 June 2015 (UTC) Discussion Weak oppose I think we already discussed a similar property once, and I think the consensus was to use multiple values of subclass of (P279) for each element. An element can be part of a block and a period. Infoboxes can ask for all the subclass of (P279) values, and with arbitrary data access ask for which p279 leads to a block, and which p279 statement leads to a period. --Tobias1984 (talk) 13:29, 18 June 2015 (UTC) @Tobias1984: Please can you link to that discussion, and/ or provide an example item which uses that model? Andy Mabbett (Pigsonthewing); Talk to Andy; Andy's edits 14:06, 18 June 2015 (UTC) @Pigsonthewing: see Help:Classification : blocks can be seen as classes of elements. For example we can write < Hydrogen > instance of (P31) miga < s-block element > , with < s-block element > subclass of (P279) miga < chemical element > . With the help of WD:Property proposal/Generic#subclass, we can even express that each s-block element atom is a member of exactly one of the subclasses. 16:22, 18 June 2015 (UTC) @TomT0m: Thank you. My request was for a link to the previous discussion of "a similar property" to the one proposed, and an example - if one exists - of where the model for periodic table blocks proposed by Tobias1984 is already used. Andy Mabbett (Pigsonthewing); Talk to Andy; Andy's edits 19:22, 18 June 2015 (UTC) Weak oppose generic classification tools can handle this. As long as we have a good definition for the s-block element metaclass, which seems to me pretty clear (but I'm not an expert). 16:27, 18 June 2015 (UTC) ### State of matter at STP In progress Description State of a substance at standard temperature and pressure phase (Q104837) Item chemical elements and compounds One of: solid (Q11438), liquid (Q11435), gas (Q11432) sodium chloride (Q2314) → solid (Q11438) Freebase Freebase import Motivation Needed to import https://www.freebase.com/chemistry/chemical_compound/phase_at_stp - not to be confused with phase of matter (P515). Andy Mabbett (Pigsonthewing); Talk to Andy; Andy's edits 13:58, 18 June 2015 (UTC) Discussion ### electrons per shell In progress Description Number of electrons per shell, of a chemical element. Qualified with the shell number. Number |electrons per shell= in en:Template:Infobox element instances of chemical element (Q11344) integers; max = 18 iron (Q677) → 2, 8, 14, 2 (shells 1-4 respectively) Freebase Freebase import Motivation Qualified with "electron shell number" (see below). Needed to import https://www.freebase.com/chemistry/chemical_element/electrons_per_shell Andy Mabbett (Pigsonthewing); Talk to Andy; Andy's edits 14:55, 18 June 2015 (UTC) Discussion Comment this should either be of datatype string, or if we stay with number, we need a qualifier to indicate which number corresponds to which shell. --Pasleim (talk) 13:07, 22 June 2015 (UTC) ### electron shell number In progress Description Number of electron shell, of a chemical element. Number instances of chemical element (Q11344) integers; max = 7 iron (Q677) has shells 1-4 Freebase Freebase import Motivation Qualifier of "electrons per shell" (see above). Needed to import https://www.freebase.com/chemistry/chemical_element/electrons_per_shell Andy Mabbett (Pigsonthewing); Talk to Andy; Andy's edits 14:55, 18 June 2015 (UTC) Discussion Which purpose has this value?--Kopiersperre (talk) 07:05, 19 June 2015 (UTC) ### electron configuration In progress Description electron configuration String |electron configuration=, in en:Template:Infobox element Chemical elements iron (Q677) → [Ar] 3d6 4s2 Freebase Wikidata:Property proposal/Natural science#electrons per shell Motivation Needed to import https://www.freebase.com/chemistry/chemical_element/electron_configuration Could be qualified with the item for the corresponding element (argon (Q696) in the example given). Andy Mabbett (Pigsonthewing); Talk to Andy; Andy's edits 15:07, 18 June 2015 (UTC) Discussion ### solvent In progress Description Substance which will dissolve this item Item Solvents Erythritol tetranitrate (Q417174) → acetone (Q49546) Freebase Freebase import Motivation Needed to import https://www.freebase.com/chemistry/solubility_relationship/solvent Andy Mabbett (Pigsonthewing); Talk to Andy; Andy's edits 16:09, 18 June 2015 (UTC) Discussion • Needs a qualifier (very soluble / freely soluble / soluble / sparingly soluble / slightly soluble / very slightly soluble)--Kopiersperre (talk) 07:05, 19 June 2015 (UTC) @Kopiersperre: No, I think we have to go out of this non scientific way to classify solubility. I agree with the property solvent but not as main property but as qualfifier of the property solubility. Snipre (talk) 12:54, 22 June 2015 (UTC) Label g·l−1 very soluble > 1000 freely soluble 100-1000 soluble 33-100 sparingly soluble 10-33 slightly soluble 1-10 very slightly soluble 0,1-1 not soluble < 0,1 Isn't this an option?--Kopiersperre (talk) 19:05, 22 June 2015 (UTC) @Kopiersperre: This is not scientific because this is the result of an evaluation: you have to provide the reference of the table in order to be able to understand what soluble is. Solubility in g/l or mg/l is an absolute value and not a relative like the ones you proposed. Then this table doesn't allow to classify components having the same class of solubility: between 100 and 1000 g/l there is a huge gap. Better use absolute values and let later the data user filter or translate these data into relative index. Snipre (talk) 13:31, 23 June 2015 (UTC) @Snipre: This convinces me.--Kopiersperre (talk) 13:58, 23 June 2015 (UTC) ### WHMIS label In progress Description Workplace Hazardous Materials Information System (Canada) Workplace Hazardous Materials Information System (Q909418) String chemical compounds A,B1,B2,B3,B4,B5,B6,D1A,D1B,D2A,D2B,D3,C,E,F methanol (Q14982) → B2, D1B, D2A, D2B, http://www.csst.qc.ca/prevention/reptox/pages/repertoire-toxicologique.aspx Motivation Similar to the GHS. Snipre (talk) 20:42, 22 June 2015 (UTC) Discussion ## Medicine / Medizin / Médecine Please visit Wikidata:WikiProject Medicine for more information. To notify participants use {{Ping project|Medicine}} ## Mineralogy Please visit Wikidata:WikiProject Mineralogy for more information. To notify participants use {{Ping project|Mineralogy}} ### Solid solution series with In progress Description the mineral forms a continous or discontinous "solid solution series" with another mineral solid solution (Q787619) Item put Wikipedia infobox parameters here, if existing; ex: "population" in en:template:infobox settlement Q templates valid minerals chrysoberyl-mariinskite series; chrysoberyl forms a series with mariinskite and vice-e-versa; hedenbergite-petedunnite; hedenbergite forms a series with petedunnite and vice-e-versa (sample: 7 digit number can be validated with edit filter Special:AbuseFilter/17) mindat.org (Q15221937) - [1] no Chris.urs-o (talk) Discussion (Add your motivation for this property here.) Chris.urs-o (talk) 06:47, 4 January 2015 (UTC) @Snipre: --Tobias1984 (talk) 08:13, 7 January 2015 (UTC) Sorry too specific for me. I have only knowledge in chemistry and engineering stuff. Snipre (talk) 12:40, 7 January 2015 (UTC) Support Looks useful. --Tobias1984 (talk) 08:13, 7 January 2015 (UTC) ### Pseudo crystal habit In progress Description the chemical compound may seem to have a higher symmetry Item put Wikipedia infobox parameters here, if existing; ex: "population" in en:template:infobox settlement Q templates pseudomonoclinic, pseudoorthorhombic, pseudotetragonal, pseudotrigonal, pseudohexagonal, pseudocubic Leucite and CdCl2 have a orthorhombic crystal symmetry, but they show a pseudo cubic crystal habit (sample: 7 digit number can be validated with edit filter Special:AbuseFilter/17) mineralienatlas.de, mindat.org no Chris.urs-o (talk) Discussion (@Sbisolo:, @Tobias1984:, @John Mortimore:; it could be a subproperty of habitus; it is important to know that a mineral appears to have a higher symmetry although it is not perfect) Chris.urs-o (talk) 07:23, 4 January 2015 (UTC) Comment I am wondering if it is also possible to query this. A mineral has a crystal structure that links to a symmetry. The habit of a mineral also has a symmetry. If the symmetries don't match, then the habit is called e.g. pseudocubic. But maybe this explicit approach would be good too. --Tobias1984 (talk) 08:16, 7 January 2015 (UTC) • Ok, let's try. The crystal system is a physical characteristic determined in the laboratory. The habit is a visual appearance of the species sample. I suppose that the pseudocrystal habit would be a subproperty of habit. • Halit (NaCl) has a cubic symmetry, with following cell parameters: a =5.6404(1) Å =b =c and α=90° =β =γ • Analcime (Na2(Al2Si4O12) · 2H2O) has a triclinic symmetry, but it always looks pseudocubic. Cell parameters: a =13.723 to 13.733 Å =b =c • Boracite (Mg3(B7O13)Cl) has a orthorhombic symmetry, but often a pseudocubic morphology. Cell parameters: a = 8.577(6) Å, b = 8.553(8) Å, c = 12.09(1) Å • Perovskite (CaTiO3) has a orthorhombic symmetry, but often a pseudocubic morphology. Cell parameters: a = 5.447(1) Å, b = 7.654(1) Å, c = 5.388(1) Å • Bernalite (Fe(OH)3 · nH2O (n = 0.0 to 0.25)) has a orthorhombic symmetry. Morphology: flattened pyramidal crystals, pseudo-octahedral to pseudo-cubic. Cell parameters: a = 7.544 Å, b = 7.56 Å, c = 7.558 Å • Pertlikite (K2(Fe2+,Mg)2Mg4Fe23+Al(SO4)12 · 18H2O) has a tetragonal symmetry, but often a pseudocubic morphology. Cell parameters: a = 19.2080 Å, c = 27.2158 Å Regards --Chris.urs-o (talk) 05:57, 10 March 2015 (UTC) ## Informatics Please visit Wikidata:WikiProject Informatics for more information. To notify participants use {{Ping project|Informatics}} ### Kernel version In progress Description put English description for property here, e.g. same as in the infobox documentation Linux kernel (Q14579) String Linux and BSD distributions Valid version numbers Debian (Q7593): version (P348) => 7 with qualifier "kernel version" => 3.2.41 Distribution mailing lists --Tobias1984 (talk) 21:53, 1 December 2014 (UTC) Discussion Notified participants of Wikiproject Informatics --Tobias1984 (talk) 21:53, 1 December 2014 (UTC) • This seems like an overly specific property. Wouldn't it be better to create a more general property that lists the packages supplied by a distribution, with the version number as a qualifier? (This would also imply making an item for each major version of a distribution. Also, some distributions ship multiple kernel versions over their lifetime, which I think would be difficult to express if kernel version already is a qualifier.) —Ruud 16:51, 19 December 2014 (UTC) • Oppose @Tobias1984:I would rather see the use of the has part (P527) property with a qualifier "version", or directly a "linux 3.2.41" item, subclass of "linux" or something, with a "version" statement. • Comment You can’t put qualifiers on qualifiers, so in the above example, this would require a separate item for Debian 7. —DSGalaktos (talk) 12:32, 28 March 2015 (UTC) Notified participants of Wikiproject Informatics : I think it would be better to use items for software versions, Python2.6 is an edition of python, for example, and that would make us aligned with Wikidata:WikiProject Books. 12:11, 6 June 2015 (UTC) Items for software versions would mean we create a new item for notepad++ 6.8.7.2 and InternetExplorer 11.0.9600.17801? --Pasleim (talk) 22:44, 6 June 2015 (UTC) @Pasleim: I guess that when there is a lot of releases it's way overkill to go up to minor patch versions. But I guess not all of them are published anyway, even in that case there would not be 17801 items for 11.0.9600 :) If we would not maintain a history of versions with version search, nobody would create all the items anyway, except if this is done automatically. So I don't think we really have to worry about that. What we would gain is that when several distros includes Linux 4.2.1, we just have to say < RHEL4.6 > has part search < Linux 4.2.1 > and not < RHEL4.6 > has part search < Linux > version search < 4.2.1 > and < Ubuntu Zeta Zebra > has part search < Linux > version search < 4.2.1 > , that we will be able to put statements about Linux 4.2.1, for example added feature, and regularity of the model, so less special cases in query or in infobox templates. 11:33, 7 June 2015 (UTC) @TomT0m, Pasleim: Notability for software releases is a really difficult topic. If we make items for versions will also mean that we run 2 approaches parallel. In any case we can only gather data about programs that have some kind of written release information. But we also need to ignore the bugfix releases if we want to keep the whole system manageable. Wikidata is also really bad for inputting long lists of data into a single property, which makes version history editing difficult. --Tobias1984 (talk) 15:44, 7 June 2015 (UTC) @Tobias1984: Why would that be difficult ? We can make it very simple if we want. Like I said, it's not because we create items that the history on software that we will store be longer than if we do not. It's a separate question. It's because (hypothetically) we chose the create items solution that this will modify the number of statements per page. 16:42, 7 June 2015 (UTC) ### Lithography In progress Description lithography in nanometers Item central processing unit (Q5300) / electronic circuit (Q1815901) 22, 32, 45, 65, 90, 130, 180, 250. Xeon 3040 (Q15229424) : 65 nm Intel website, for Intel processors Robots can gather info on the Intel website and fill the property with it. MisterSanderson (talk) Discussion I want to add information to the CPU items, but there aren't enough properties to that. MisterSanderson (talk) 00:48, 25 November 2013 (UTC) changed datatype. Filceolaire (talk) 22:44, 25 November 2013 (UTC) Why "number with dimension" instead of simply "number"?--MisterSanderson (talk) 00:48, 26 November 2013 (UTC) Because this is a measurement of length. Remember that while current processors are measured in nanometers past processors were measured in micrometers and future processors will be measured in picometers. Filceolaire (talk) 07:46, 30 November 2013 (UTC) Given the diameter of a silicon atom (over 0.2 nm), I think it will be fairly unlikely that we will ever need the measure lithographic processes in picometers ;) —Ruud 17:29, 19 December 2014 (UTC) Support the dimension would be the physical unit "meter". I think everybody uses simply number because the other thing doesn't seem to work with the template. --Tobias1984 (talk) 16:04, 27 November 2013 (UTC) What about AMD?--Kopiersperre (talk) 13:38, 11 November 2014 (UTC) @Kopiersperre: I am not an expert where else this measurement is used, but I think the domain "semiconductors" would probably sum it up? --Tobias1984 (talk) 22:02, 21 November 2014 (UTC) @Tobias1984: I must point out, that a 22 nm processor does not have any element, which is 22 nm long. (See Keine 14-Nanometer-Struktur in Broadwell) --Kopiersperre (talk) 14:10, 23 November 2014 (UTC) @Kopiersperre: That certainly makes things more complicated. In that case we should rely on independent measurements and not the marketing words. Maybe even require a qualifier that states how the measurement was made (e.g. with an ion probe). --Tobias1984 (talk) 15:02, 23 November 2014 (UTC) I think what Kopiersperre means is that the term "22 nm" is the name of a particular lithographic process (sometimes it's qualified by the name of the semiconductor foundry), and should not be directly interpreted as a physical quantity (nor should we try to make it into one by relying on "independent measurements"). We can be pragmatic and make it into a number with dimension as the names of lithographic processes have always followed the convention of being a number followed by "micrometer" or "nanometer". —Ruud 17:00, 19 December 2014 (UTC) Actually, Wikipedia already has articles on the various processes and Wikidata thus has items on them: 22 nanometer (Q1059061), 1.5 µm process (Q1135912), Category:International Technology Roadmap for Semiconductors lithography nodes (Q7003854), ... We should probably link them to those instead. —Ruud 17:22, 19 December 2014 (UTC) @Ruud Koot: - It might be a good idea to make this an item-datatype instead. That way we can avoid the situation described by User:Kopiersperre. --Tobias1984 (talk) 20:35, 19 December 2014 (UTC) ### TeX string In progress Description the appropriate string to show a concept in Tex or Latex string (multilingual for examples?)-invalid datatype (not in Module:i18n/datatype) ? very diverse tex commands with simple example values in them fraction (Q66055) = "\frac{numerator}{denominator}", binomial distribution (Q185547) = "\binom{n}{k}", square root (Q134237) = "\sqrt[2]{x}", circumflex (Q11175) = "\^{o}" ? tex documentation ? --Tobias1984 (talk) 11:09, 19 December 2014 (UTC) Discussion Notified participants of Wikiproject Informatics --Tobias1984 (talk) 11:10, 19 December 2014 (UTC) Notified participants of Wikiproject Informatics --Tobias1984 (talk) 19:20, 2 January 2015 (UTC) • Oppose LAtex is not a standard. Why use this kind of programming language and not another one ? Snipre (talk) 12:40, 14 January 2015 (UTC) @Snipre: I don't know if it has been standardized, but it is used were widely. And it would be a nice feature to ask Wikidata "What is the latex symbol for a vector?" and have the string returned. --Tobias1984 (talk) 07:30, 15 January 2015 (UTC) Support seems useful. @Snipre: latex is used in wikipedia articles for maths formula. Allow Wikidata to store tex code seems at least useful in this context. 22:30, 15 January 2015 (UTC) @TomT0m: Wikipedia uses lua as well: do you want to create a property for the name of the lua function describing the mathematical function ? And what's about the people using python to create bots ? And for c++, matlab,...? From a specialised point of view, you can find always an application to some data. Snipre (talk) 11:16, 21 February 2015 (UTC) @Snipre: I don't know, seems out of scope of this discussion. What I know it is it's pretty common to have a latex formula in infoboxes about a math concept. I really don't get your point. For the standardisation argument, there is reference statement that an acknoledge this is a common notation. 11:30, 21 February 2015 (UTC) • Support Seems useful to me. --Daniel Mietchen (talk) 01:30, 4 March 2015 (UTC) • Comment the parameters shouldn't be named numerator or o but some language neutral form like1, \$2. --Pasleim (talk) 17:05, 20 May 2015 (UTC)
•  Support -- Sergey kudryavtsev (talk) 18:19, 26 May 2015 (UTC)

### Listed in PackageIndex

In progress
Description Many programs available for Linux have public listings of their packages. Connecting to these indexes would allow to check up on version numbers using bots. URL ? software Valid package indexes or repositories Inkscape (Q8041) → "https://apps.fedoraproject.org/packages/inkscape" (+Qualifier: Fedora), "https://launchpad.net/ubuntu/+source/inkscape" (+Qualifier Ubuntu)
Motivation

As usual this should improve Wikidatas interlinking between relevant software pages. Bots can use these pages to check if a newer version of a program exists. --Tobias1984 (talk) 21:35, 12 June 2015 (UTC)

Discussion

## Maths

### statement describes

In progress
Description a formalization of the statement contains a bound variable in this class Item statement (Q2684591), conjecture (Q319141) mostly mathematical objects Pythagorean theorem (Q11518) => right triangle (Q158688), abc conjecture (Q306393) => natural number (Q21199) Danneks (talk)
Discussion

Notable property for theorems; could be used in substitution templates, in preambles of Wikipedia articles. Danneks (talk) 13:08, 1 October 2014 (UTC)

I want to add that I don't think this is an ideal way to organize the data about theorems, but it will be needed (at least) during the initial period to make the data more discoverable. At the moment, Wikidata knows about circa 1800 theorems and 200 conjectures, and the only search option are labels (which is not very good, because the name of a theorem usually does not describe its content). Danneks (talk) 20:22, 12 October 2014 (UTC)

Support good compromise beetween expressivity and modelisation of the formula. 18:55, 10 March 2015 (UTC)

•  Support. I think this property could usefully be used for similar theorems and 'laws' outside the scope of mathematical objects. For example "Parkinson's Law:statement describes:project management"? Filceolaire (talk) 17:24, 18 June 2015 (UTC)
If there is a source which states that Parkinson's Law is something like "In most cases of project management...", then I don't see a reason why this property cannot be applied. Anyway the property's description doesn't specify a formal language etc. Danneks (talk) 01:30, 24 June 2015 (UTC)

### image of a function

In progress
Description the set of values that a function actually has image of a function (Q1806121) Item instances of map (Q370502), function (Q11348), morphism (Q1948412), binary relation (Q130901) instances of set (Q36161), class (Q217594) square function (Q3075175) → non-negative real number (Q18729403) Petr Matas
Discussion

A function must produce all values specified by this property, but it does not need to produce all values specified by codomain (P1571). Therefore the former provides more information, whereas the latter is simpler. Petr Matas 15:05, 8 January 2015 (UTC)

Support --Tobias1984 (talk) 15:19, 8 January 2015 (UTC)
@Petr Matas: Can you still create the target-item in the example. We could put a list of number-sets on the property talk-page and make a "one-of" constraint for that list. --Tobias1984 (talk) 15:19, 8 January 2015 (UTC)
I could not find the right item, probably we will have to create it. We should also discuss, whether item is the right data type for this property and for domain (P1568). Petr Matas 15:35, 8 January 2015 (UTC)
@Petr Matas: Items seems right to me. It makes translation easier in this case and I think that number-sets could hold statements of their own. In the case of non-negative real numbers could have statments like: smallest value = 0, largest value = infinity, ... - I also don't think that there is an item for "non-negative real numbers". If we ever find one in minor language, we can just merge the items. --Tobias1984 (talk) 16:14, 8 January 2015 (UTC)
Ok, non-negative real number (Q18729403) created. Petr Matas 17:10, 8 January 2015 (UTC)
@Tobias1984, Petr Matas: count nonzero real number (Q19546578) () in :) 18:40, 10 March 2015 (UTC)
Support. 18:40, 10 March 2015 (UTC)
@Petr Matas: The value of the sudgested property depend on definitional domain (domain (P1568)), e.g. square function (Q3075175) of a complex number is a complex number. How to handle with such cases? -- Sergey kudryavtsev (talk) 10:32, 24 April 2015 (UTC)
May be better use domain (P1568) as qualifier? -- Sergey kudryavtsev (talk) 10:39, 24 April 2015 (UTC)
@Sergey kudryavtsev: I say we can totally have several items linked somehow, as functions with different domains are mathematically speaking different function. We could have
< complex number square function > generalization of search < real number square function >
, maybe with
< complex number square function > instance of (P31) miga < function that computes a square >
and
< real number square function > instance of (P31) miga < function that computes a square >
. 10:47, 24 April 2015 (UTC)
Therefore you gets a incorrect (ambiguous item) example for this property. If square function (Q3075175) means "square function of a real number", we should rename it correctly, even if in English.
However my suggestion of domain (P1568) as qualifier looks reasonable and make it possible to handle with both ambiguous and definitely defined items. Even mathematical statement f(x): R → R shows a function domain and image together. -- Sergey kudryavtsev (talk) 12:13, 24 April 2015 (UTC)
I don't know, this seems later harder to use the item in a statement, requires also a qualifier, a default value ... On the other hand making two items is easy and makes the use of the items non ambiguous. Labels in Wikidata can be the same, it's the description that is used to disambiguate, so there is no problem of keeping the square function label for the function on real numbers. Creating a class item of function that have the usual properties of a square function also makes sense conceptually, it could be associated with those properties that makes us say this function is a square function, for example. This is way more advanced stuff than students could encounter when they first hear of the square function, and usually the Wikipedia article about square function is about the function on real numbers. So it is a model that leaves the room for several articles on Wikipedias that are for different kind of readers. 13:19, 24 April 2015 (UTC)
Wikipedia usually discusses the real function in the first place, so the article should be linked to the real function item, which will be used to populate the main infobox. The complex function is usually only discussed in a section of the same article, and a second infobox linked to the complex function item can be added to that section. Therefore the class item is not going to be used by Wikipedias and the domain/codomain/input set/image statements can be left out from it. Petr Matas 12:11, 25 April 2015 (UTC)
Comment There are four sets related to function input and output. Properties for three of them have already been created and this proposal is for the last one missing:
$f(x) = x^{-2}$
input set (P1851) real number (Q12916) codomain (P1571) real number (Q12916)
domain (P1568) nonzero real number (Q19546578) image of a function positive number (Q3176558)
Petr Matas 14:02, 26 April 2015 (UTC)

In progress
Description this logic inference rule is admissible in that logical system Admissible rule (Q1560157) Item Rule of inference (Q1068763) () type(s) d'éléments liés (modèle Q ou texte), liste ou intervalle de valeurs permises, format de chaîne de caractères... admissible in search (exemple : 7 chiffres peuvent être validés avec le filtre d'édition Special:AbuseFilter/17) external reference, Wikipedia list article, etc. Devrait-il y avoir ou existe-t-il des bots ou des gadgets qui effectueront des tâches avec cette propriété? Par exemple: vérifier les autres propriétés afin d'être cohérent, collecter des données, automatiser un lien externe, etc.
Discussion

Motivation:

Proposed by:

The items exists, the relation also exists, there is an article about it and they gives useful informations about the logics. 18:35, 1 April 2015 (UTC)

## All sciences

### study of

In progress
Description the subject is a science or domain studing the object Item indiquez ici les attributs d'infobox de Wikipédia correspondants, s'il en existe, par exemple : « population » dans fr:Modèle:Infobox Subdivision administrative branch of science (Q2465832), broader pretty much anything exemple d'élément qui utiliserait cette propriété, avec une valeur proposée; par exempl : algorithmics (Q13636890) => algorithm (Q8366) ; physics (Q413) => matter (Q35758) physics (Q413) => motion (Q79782) ; <  > study of search <  > <  > study of search <  > study of search <  > <  > study of search <  >  ; <  > study of search <  > <  > study of search <  > ... (exemple : 7 chiffres peuvent être validés avec le filtre d'édition Special:AbuseFilter/17) Devrait-il y avoir ou existe-t-il des bots ou des gadgets qui effectueront des tâches avec cette propriété? Par exemple: vérifier les autres propriétés afin d'être cohérent, collecter des données, automatiser un lien externe, etc.
Discussion

Help scoping a lot of items and linking object to their sciences. A lot of structuring power, a help on automatic item disambiguation, a help on scoping Wikipedia article who sometimes mixes the two subjects. Can potentially help restoring lost interwikis : if some Wikipedia has an article on the science and the other one on the object, the interwiki language link might have been lost, as this is a common pattern a custom template can propose a link to the Wikidata item and redirect to the corresponding article in the other language. 10:28, 20 September 2014 (UTC)

Support, it can be very useful as a replacement of categorization. Danneks (talk) 13:48, 1 October 2014 (UTC)
Oppose, is just part of (P361) for science--Kopiersperre (talk) 14:26, 14 October 2014 (UTC)
This is not "part of", it would be more like has part (P527), but I do not think it is exactly that either. I support the idea, but as a general rule, I think it should be used only with more generic values. If "number: subclass of: mathematical object", and "mathematics: study of: mathematical object", then it does not seem necessary to add "mathematics: study of: number" (else where do we stop ?) --Zolo (talk) 16:03, 14 October 2014 (UTC)
@Zolo: I just took the statements from the Wikipedia articles. Study of numbers is a pretty common definition of maths, so there is no harm, and numbers (or sets in maths foundations) can pretty much the starting point to encode any other math objects. So it's just a matter of choice, there is no problem with beeing somewhat redundant if their is no contradiction, it's not a big deal. And it's just a detail, I think it's important to link a science to the type of concept it studies (way more) :) 11:43, 21 February 2015 (UTC)
Support, but wouldn't calculus be the study rather than the subject, with e.g. integral(s) and derivative(s) as the subject? —SamB (talk) 14:21, 15 April 2015 (UTC)

Question Is

study of search

a good or a bad one? study of gives no sense to me. I think it's vice versa:

<  > is studied by search <  >
(or
<  > part of (P361) miga <  >
)
<  > are studied by search <  >
(nothing to put here)

--Succu (talk) 20:43, 26 June 2015 (UTC)

### eruption

In progress
Description item representing an eruption by this volcano volcanic eruption (Q7692360) Item volcano (Q8072) instances of volcanic eruption (Q7692360) Mount Ontake (Q1754806) => 2014 Mount Ontake eruption (Q18145950) with qualifier, start time = September 27, 2014
Motivation

To connect volcanoes with eruptions, with qualifier start time (P580) ValterVB (talk) 20:09, 28 April 2015 (UTC)

Discussion
•  Support Extremely important item.93.33.113.74 21:28, 28 April 2015 (UTC)
•  Support why not? - Brya (talk) 05:35, 29 April 2015 (UTC)
•  Comment Copy edited. Andy Mabbett (Pigsonthewing); Talk to Andy; Andy's edits 06:57, 29 April 2015 (UTC)
•  Question would not significant event (P793) miga fit ? This is typically the stuff for which we created this property. So I'll  Oppose if no good reasons is found : reason : another possibility fits, avoid multiplicity of modelling that could add confusion. 07:08, 29 April 2015 (UTC)
• Do you mean significant event (P793)? That seems to work, see my recent edits to 2014 Mount Ontake eruption (Q18145950). Andy Mabbett (Pigsonthewing); Talk to Andy; Andy's edits 07:52, 29 April 2015 (UTC)
• Yep, that's what I mean. 09:38, 29 April 2015 (UTC)
• Is a significant event necessarily an eruption? People killed by an avalanche might be considerated as a significant event occured on a volcano flanks but its far from being an eruption, in my point of view. Also, consider this item as soemthing strictly related to VNUM and VEL items.  SupportPaolobon140 (talk) 13:25, 29 April 2015 (UTC)
• @Paolobon140: No it's not, but as the object will be an instance of eruption, this allows us to filter the relevant events in the infobox, for example. Or in a query. It's not hard. 15:36, 29 April 2015 (UTC)
• @TomT0m: I have proposed a new property because I wasn't sure that we could filter different relevant events for infobox. If is possible I'm agree to use significant event (P793). --ValterVB (talk) 15:59, 29 April 2015 (UTC)
• @ValterVB: We need arbitrary access, not deployed yet (except in Wikidata) but the devs are working on it ATM and making progress. Should not be long, maybe in the next deployment, they seem to have made the groundwork. 16:13, 29 April 2015 (UTC)
Oppose per TomT0m --Pasleim (talk) 20:57, 4 May 2015 (UTC)
@ValterVB, Brya, Pigsonthewing, TomT0m, Pasleim, Paolobon140: The question which is not clear: do we have to create an item for each eruption or do we save data about eruptions as statements in the volcano item ? If we create an item for each eruption, we don't need a new property: just link the eruptions items with the volcano item using "part of" or similar properties. Snipre (talk) 23:43, 17 May 2015 (UTC)
@Snipre, ValterVB, Brya, Pigsonthewing, TomT0m, Pasleim:: I think saving data about eruptions as statements in the volcano items would be the best solution. That would originate a kind of history of known eruptions for every volcano item. VNUM number, which has been created a couple of weeks ago, would command on the eruptions list as well as official pages about volcanoes e.g. Philippine Institute of Volcanology and Seismology site for the Philippines volcanoes.Paolobon140 (talk) 09:24, 18 May 2015 (UTC)
Yes, item is the better solution, and for me to use "part of" in eruption item is better than to use significant event (P793) in volcano item. If no one oppose, we can delete this proposal. --ValterVB (talk) 16:44, 18 May 2015 (UTC)
I don't mind either way. - Brya (talk) 17:10, 18 May 2015 (UTC)
@ValterVB, Paolobon140: Using part of to mix an object with an event is a terrible idea. A leg is part of a body. A football match is a part of a competition. An event is a part of a bigger event. But an event is not a part of a physical object, or a physical object is not a part of an event. Events involves physical objects ... an eruption is an event in the life of a volcano. See the example in Help:Basic membership properties. 17:20, 18 May 2015 (UTC)
I fully agree with TomT0m. part of (P361) must be used only to link two items of the same nature. significant event (P793) is more appropriate to link physical objects to events. Casper Tinan (talk) 20:28, 18 May 2015 (UTC)

@TomT0m: I was going to implement the reading of this data in a template (in it.wiki we have already arbitrary access), but I have doubt. Now we have for example in Mount Ontake (Q1754806):

significant event      2014 Mount Ontake eruption
start time  27 September 2014


But AFAIK there is nothing that prevents a user to use instead:

significant event      volcanic eruption
start time  27 September 2014


It would be correct to use in this way? (I mean "volcanic eruption" instead of a dedicated item for an eruption). --Rotpunkt (talk) 12:15, 8 June 2015 (UTC)

@Rotpunkt: I think for consistency sake it's better if we try to limit the numbers of ways to express something. As there is items for some eruptions anyway, it's easier to keep only the item model. For data management we could have a query or a database pattern to detect the qualifier on event class pattern ... 17:22, 8 June 2015 (UTC)
@TomT0m: Ok thanks, so everytime I find (via Lua module) an eruption written in the second way what should I do? ignore it? --Rotpunkt (talk) 17:29, 8 June 2015 (UTC)
@Rotpunkt: Or put the page in an hidden category ? That's usually done when a bad or obsolete practice is detected by template ... Then we should clean it, by hand or by bot. 17:33, 8 June 2015 (UTC)
@TomT0m: Ok, thanks again! --Rotpunkt (talk) 18:20, 8 June 2015 (UTC)

@TomT0m, Rotpunkt, Casper Tinan, ValterVB, Pigsonthewing, Paolobon140: Can we close this proposal as not done ? Snipre (talk) 13:16, 22 June 2015 (UTC)

@Snipre: Yes Sir.Paolobon140 (talk) 08:19, 25 June 2015 (UTC)

### natural satellites

Not done
Description Natural satellites of the celestial body natural satellite (Q2537) Item astronomical object (Q6999) instances of Q2537 Earth (Q2) → Moon (Q405) w:en:List of natural satellites
Motivation

This is my first edit in here. But having read some of the docs I feel this property meets the criteria and would be useful. Chicocvenancio (talk) 04:45, 9 June 2015 (UTC)

Discussion

See astronomical body (P397) and child astronomical body (P398). Visite fortuitement prolongée (talk) 20:11, 9 June 2015 (UTC)

Thanks. This seems more general, therefore more appropriate. 191.189.136.148 04:09, 10 June 2015 (UTC)
Oppose Use child astronomical body (P398) / astronomical body (P397). -- Sergey kudryavtsev (talk) 07:00, 10 June 2015 (UTC)

Not done; Use child astronomical body (P398) / astronomical body (P397). Andy Mabbett (Pigsonthewing); Talk to Andy; Andy's edits 09:11, 11 June 2015 (UTC)