Aperture Vocabularies

Dublin Core properties:

• ​http://purl.org/dc/elements/1.1/source
• ​http://purl.org/dc/elements/1.1/title
• ​http://purl.org/dc/elements/1.1/creator
• ​http://purl.org/dc/elements/1.1/subject
• ​http://purl.org/dc/elements/1.1/keywords
• ​http://purl.org/dc/elements/1.1/description
• ​http://purl.org/dc/elements/1.1/language
• ​http://purl.org/dc/elements/1.1/type (Document Type)
• ​http://purl.org/dc/elements/1.1/format
• ​http://purl.org/dc/elements/1.1/publisher
• ​http://purl.org/dc/elements/1.1/identifier
• ​http://purl.org/dc/elements/1.1/coverage
• ​http://purl.org/dc/elements/1.1/contributor
• ​http://purl.org/dc/elements/1.1/rights
• ​http://purl.org/dc/elements/1.1/relation
• ​http://purl.org/dc/elements/1.1/date
• ​http://purl.org/dc/terms/abstract
• ​http://purl.org/dc/terms/created (Creation Date)
• ​http://purl.org/dc/terms/modified (Modification Date)

CATWIESEL properties for managing crawled data, by Heinz Kirchmann:

• urn:catwiesel:attribute:entry_type
• urn:catwiesel:attribute:uri (MY URI)
• urn:catwiesel:attribute:parent_uri
• urn:catwiesel:attribute:checksum
• urn:catwiesel:attribute:category_name
• urn:catwiesel:attribute:content
• urn:catwiesel:attribute:creation_date
• urn:catwiesel:attribute:modification_date
• urn:catwiesel:attribute:modification_time
• urn:catwiesel:attribute:number_of_pages
• urn:catwiesel:attribute:mime_type
• urn:catwiesel:attribute:content_mime_type
• urn:catwiesel:attribute:mail_subject
• urn:catwiesel:attribute:mail_to
• urn:catwiesel:attribute:mail_carbon_copy
• urn:catwiesel:attribute:mail_blind_carbon_copy
• urn:catwiesel:attribute:character_set
• urn:catwiesel:attribute:wikipedia_page_id

We should also have a look at metadata inside OpenDocument and OpenXML files. They already use Dublin Core as much as possible but also other properties for encoding page counts, generated application, etc. Perhaps that has been standardized also?