I notice that there are groups of categories like Bridges_in_California
(and all the other states) that have no skos:broader category, despite this
existing in Wikipedia.
For example, note that
http://dbpedia.org/page/Category:Bridges_in_California shows no broader
categories, while
http://en.wikipedia.org/wiki/Category:Bridges_in_California does belong to
multiple categories (and it's not an issue of dbpedia's extract just not
having caught up yet, as you can see from
http://en.wikipedia.org/w/index.php?title=Category:Bridges_in_California&oldid=12067574,
there were categories even in 2004).
Other categories, like
http://dbpedia.org/page/Category:Bridges_in_England, seem fine, and
have both "skos:broader" and "is skos:broader of" entries.
Looking at the source of the respective wikipedia pages, it appears this
may be because Category:Bridges_in_California gets belongs to categories
only via templates ("{{US bridges by state|State=California}}")
while Category:Bridges_in_England just has "[[Category:Bridges in the
United Kingdom| England]]".
I find 12,599 categories that have no broader categories. If you look at
the list ( http://pastebin.com/2tQr16Li ) you can see entries of the format
$YEAR_in_$SUBJECT, $TOPIC_in_$COUNTRY, etc, so I'm guessing that many of
these suffer from the same issue as Bridges_in_California.
So, is this a bug (maybe templates are just not parsed for category
membership?) or is there some fundamental distinction between these
different types of entries that I'm missing?
Andrew Filer
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