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# MetaData we need to represent
* embedded in the file/data object contents
* external, provided by filesystem/container
* external, provided by user/annotation apps etc. these maybe stored in e.g. filesystem extended attributes and may be stored in a separate db.
## Embedded in the file/data object contents
### Generic content
Content creators
* author(primary contributor)
* contributor(secondary contributor)
* mantainer
Author's annotation/categorization of the content
* subject
* title
* description
* comment
* keywords
* creation/last modification time
* IDs(various)
* plain-text representation for indexing purposes(not a good fit here, but it's closest)
Content legal info:
* copyright
* disclaimer
* license type
* license text
Content relations to other content:
* containment
* dependency
* link/mention
* conflicts? -- a must for software. do they apply to generic content?
* supercedes?
Content generator software specifics:
* software name(or better yet semantic link :)
* software options
Content format description/specifics:
* encoding/code page(transitional until obsoleted by UTF8).
* languages
* format subtype like BMP has or to specify format extensions.
## External, provided by filesystem/container
Location/ID
Creation/access/modification time
ACL(access control)
### Media
Generic
* sample format
* codec
* duration
* frame count
* FPS
Audio
Music
* ID3 is designed to tag music
Visual
* image size
* aspect ratio
* resolution
Video
* Frame count
* FPS
Audio+Video
Photo:
* EXIF is a good base for this
===Documents=== ===Messaging=== Generic message
* Recipient
Email
* to
* cc
* bcc
### Contacts
## External, provided by user/annotation apps etc. these maybe stored in e.g. filesystem extended attributes and may be stored in a separate db.
User's annotation of content similar to content author's one. Note: To a degree file name is a part user's annotation.
Quality etc ratings
Usage intensity
# Data types
Object
Content
Document
Text
Media
Audio
Music
Image
Photo
Video
Software
# Source type
file
attachment
message
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