Many properties store links to pages on Commons and with exception of links to images all other links are stored as ''strings'' type. I would like to propose to create new ''Commons page'' property type which would store links to Commons pages. Alternative solution would be to expand ''Commons media file'' property type . This new property type would have internal Wikibase support similar to support of ''Commons media file'' type properties or sitelinks:
- page name stored in some uniform format (categories starting with capital letter, spaces instead of underscores, etc.) which can be easily compared to sitelinks in SPARQL
- do not allow links to non-existing pages
- automatically handle pages which are deleted, redirected or moved.
Current list of properties which would be than converted to the new type: