Wikidata:Property proposal/Lloyd's Register of Ships
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Lloyd's Register of Ships
[edit]Originally proposed at Wikidata:Property proposal/Authority control
Withdrawn
| Description | Digitised pages from Lloyd's Register of Ships from 1930 to 1945 |
|---|---|
| Data type | External identifier |
| Domain | Wikidata property related to maritime and inland waterway transport (Q23779665) |
| Allowed values | [^\s\/]+ |
| Example | SS Chelyuskin (Q572950) → 33b0998 |
| Source | http://www.plimsollshipdata.org/ |
| External links | Use in sister projects: [ar] • [de] • [en] • [es] • [fr] • [he] • [it] • [ja] • [ko] • [nl] • [pl] • [pt] • [ru] • [sv] • [vi] • [zh] • [commons] • [species] • [wd] • [en.wikt] • [fr.wikt]. |
| Planned use | Use as identifier for items which are instance of (P31) ship (Q11446) |
| Formatter URL | http://www.plimsollshipdata.org/pdffile.php?name=$1.pdf |
- Motivation
PlimSoll ship data provides a searchable database of the Lloyd's Register of Ships from 1930 to 1945. It can be used as Identifier for items which are instance of (P31) ship (Q11446). Ptolusque (talk) 21:17, 8 September 2017 (UTC)
- Discussion
- Comment: Although the ID in the example links to a page from Lloyd's register, it does not appear to be the ID for a single vessel; the page linked to lists several vessels (and is presented as an image of a scan). Andy Mabbett (Pigsonthewing); Talk to Andy; Andy's edits 22:19, 8 September 2017 (UTC)
- @Pigsonthewing:You are right, but this applies to other identifiers as well. Identifiers can be surjective. --Ptolusque (talk) 07:37, 9 September 2017 (UTC)
- @Ptolusque: actually in general we have defined external identifiers in wikidata as strings which uniquely identify the items they are linked to; two identical id's listed on two different wikidata items would generally be a constraint violation. So I don't think this works as an identifier in that sense for ships. You could propose it as a string property I guess. But it seems this is something particular to this particular source and so would make most sense I think as part of reference information for other data about the ship. I notice that the left-most column in the linked example does seem to have an identifying number (39018 for the first ship on the list) – is this a Lloyd's number that really might be an identifier for ships? ArthurPSmith (talk) 19:21, 13 September 2017 (UTC)
- @Pigsonthewing:You are right, but this applies to other identifiers as well. Identifiers can be surjective. --Ptolusque (talk) 07:37, 9 September 2017 (UTC)
Oppose in current form because the property name is misleading. Something along the lines of Plimsoll ShipData Lloyd's Register of Ships Scanned Page ID is a better description of what this property actually represents. I note that the ID format appears to be yyvpppp where yy is the year of the register, 'v' is the volume of the register in that year, and pppp is the page within the register that has been scanned (starting at 0001). I'd suggest this Plimsoll ShipData Lloyd's Register of Ships Scanned Page ID property by used only as a qualifier on a new property to be proposed: Lloyd's Register Ship ID. Dhx1 (talk) 12:50, 13 September 2017 (UTC)
- Agreed. Plimsoll ShipData Lloyd's Register of Ships Scanned Page ID describes the possible surjective character of the database ID format most precisely. I'm going to propose two separate property proposals: Lloyd's Register Ship ID with the actual ID (number in book) as variable and Plimsoll ShipData Lloyd's Register of Ships Scanned Page ID as authority control property with formatter URL (P1630). Thanks. --Ptolusque (talk) 20:13, 13 September 2017 (UTC)
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