Semantic MediaWiki and related extensions
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Enforce limitation of maximal number of values.
Enforce uniqueness of properties in declaration.
Complete internationalisation.
Theparsing process can encounter many kinds of well-defined problems but uses only one error message. More detailed reporting should be done.
Try to reuse more of MediaWiki's records, e.g. to obtain month names or to format dates. The problem is that MW is based on SIO timestamps that don't extend to very ancient or future dates, and that MW uses PHP functions that are bound to UNIX time.