Some initial ideas on the statement. I realize that this is not
priority in the first phase, but perhaps on the wiki a place could be
created to collect some thoughts like those below?
http://meta.wikimedia.org/wiki/Wikidata/Notes/Data_model#The_Metamodel explains:
Statement = (StatementID, Property, Value, Qualifier*, Reference*)
The StatementID is a unique identifier for the given statement and
used only internally and for export.
A Property is defined on a property page. This definition includes a type.
The structure of the Value is given by the type of the property.
Simple types could demand an EntityID or a number. More complex types
could demand dates, date ranges, numbers with units, a geocoordinate,
a geo shape, etc.
----
1. Will Property include information on
observation/recording/measurement methodology?
2. What happens if the main entity has variants or parts for which
values are recorded?
An example is car models, where typically the revisions sold under the
same name are subsumed in one Wikipedia article. Example:
http://en.wikipedia.org/wiki/Renault_Kangoo
with different length / weight in the "subclass" info boxes for
first/second generation.
Cars also easily serve as an example for variable parts, see in
http://en.wikipedia.org/wiki/%C5%A0koda_Roomster the list of engine
specifications. The engines are not Wikipedia entities in their own
right.
3. Values may be well defined RDF-resources, but now available in Wikipedia.
In my work, many statements I would like to express in a future
Wikidata are not allowed as Wikipedia articles at all. You can express
"Wowereit" is_mayor_of "Berlin, Germany"
but not
"Plantago lanceolata" has_leaf_shape "lanceolate"
because
http://en.wikipedia.org/wiki/Lanceolate
is a redirect to
http://en.wikipedia.org/wiki/Leaf_shape
I personally would love to have illustrated definitions of things
people want to learn about being allowed on Wikipedia, but the
argument is generally that Wikipedia is not Wiktionary.
I believe Wikidata should right from the start be defined to allow
references to Wiktionary as well as Wikipedia. And while we are at it,
references to Commons as well (semantic image annotation...)
This would change
Wikipedialink = (Title, LanguageId, Badge?)
to
Link = (Project, LanguageId, Title, Badge?)
---
Gregor