OAI-PMH characteristics: mod_oai
a subset of http_header in DC
oai_dc
metadataPrefix
modification date of resource
2004-07-31
datestamp
    Record
MPEG-21 DIDL: base64 encoded resource + http_header metadata
oai_didl
metadataPrefix
modification date of resource
2004-07-31
datestamp
    Record
modification date of resource
2004-07-31
datestamp
the http headers that would have been returned via HTTP GET/HEAD
http_header
metadataPrefix
    Record
MIME type of the resource
MIME type
set membership
same URL as the resource
URL
identifier
Item
HTML, GIF, PDF or other web file
URL
Resource
description
value
OAI-PMH Entity