The Object Type Authority List provides data values for the Object Type element.
ASCII Text
EBCDIC Text
EBCDIC Binary
HTML
Shapefile
XML
ZIP
Audiovisual (RealMedia Video Stream)
Audiovisual File (AVI)
Audiovisual File (MOV)
Audiovisual File (MP4)
Audiovisual File (WMV)
Image (BMP)
Image (GIF)
Image (JPG)
MS Excel Spreadsheet
Microsoft PowerPoint Document
Microsoft Word Document
Microsoft Write Document
Portable Document File (PDF)
Sound File (MP3)
Sound File (WAV)
World Wide Web Page
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Source:
http://www.archives.gov/research/search/lcdrg/authority_lists/objecttypelist.html
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