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h1. Document information

| *Title:* MPEG21 DIDL Application Profile for Institutional Repositories \\
*Subject:* MPEG21 DIDL \\
*Moderator:* Thomas Place \\
*Version:* 3.0 \\
*Date published:* 2009-04-18 \\
*Excerpt*:{excerpt} This document is an adaptation of "MPEG21 DIDL Application Profile for  NEEO" version 0.4 ([http://drcwww.uvt.nl/~place/neeo/didl%20application%20profile.0.4.doc|http://drcwww.uvt.nl/~place/neeo/didl%20application%20profile.0.4.doc]). The latter was based on Maurice Vanderfeesten (2008), "MPEG21 DIDL  Document Specifications for repositories" version 2.3.1 [https://www.surfgroepen.nl/sites/oai/complexobjects/Shared%20Documents/DIDLdocumentSpecification_EN_v2.3.doc|https://www.surfgroepen.nl/sites/oai/complexobjects/Shared%20Documents/DIDLdocumentSpecification_EN_v2.3.doc]\\ \\
\\
 {excerpt}\\
\\
(Optional information) \\
*Type:* \\
*Format:* \\
*Identifier:* \\
*Language:* \\
*Rights:* \\
*Tags:* {page-info:labels}
{contributors-summary}
{tracking-info} |

Document History

Date	Version history	Owner	Changelog	PDF
18 April 2009	3.0	SURFshare	Start of version 3.0. Based on NEEO document "MPEG21 DIDL Application Profile for Institutional Repositories" version 0.4, which is based on "MPEG21 DIDL Document Specifications for repositories" version 2.3.1. See also history. Note that this is the first version of this document. The version number (3.0) indicates that it is more recent and more up-to-date than the predecessors on which it is based by having a higher number than their latest versions. Changes: Less strict remarks on the location of the namespace declarations. The number of Descriptors is unlimited. Type of a Digital Item is expressed as an URI being the value of the rdf:resource attribute of a rdf:type element. Type statements are also allowed at the top level. Instead of using not yet registered terms from info:eu-repo/semantics/, the terms from the Eprints Access Rights Vocabulary must be used for expressing the accessibility of an object For the date of deposit of an object in a repository dcterms:dateSubmitted is to be used (was dcterms:issued)	Download PDF
22 Januari 2008	2.3.1	SURFshare	Minor change in the schema path. ISO changed the path .../dii.xsd/dii.xsd to .../dii/dii.xsd Minor change in the examples the mimetype for humanStartPage resources changed from "application/html" to "text/html". "application/html" is not a valid mimetype.	Download PDF
05 December 2007	2.3	SURFshare	Changes to stress the use of Persistent Identifiers in the DIDL document. The addition of the ORE compliant info:eu-repo namespace
23 May 2007	2.2.2	SURFshare	Some changes and little tweaks.
23 March 2007	2.2.1	SURFshare	Added comment of Peter van Huisstede, small corrections in the example XML.
6 March 2007	2.2	SURFshare	The Committee for Complex Objects looked at this document and came with more elegant improvements. Thanks to: Thomas Place, Renze Brandsma, Henk Ellermann, Peter van Huisstede and Ruud Bronmans.
20 February 2007	2.1	SURFshare	A closer look at the recommendations of Herbert vd Sompel gave more insight in the DIDL semantics, and thus leading to a better XMLspecification.
2 January 2007	2.0	SURFshare	Fundamental change of element and attribute use; for better representation of the semantics. Additional texts for driver guidelines from Martin Feijen, new DIDL according to comments of Herbert vd Sompel, new DIDL schema. (http://purl.lanl.gov/STB-RL/schemas/2006-09/DIDL.xsd)
4 December 2006	1.1.2	SURFshare	Translated into English for DRIVER
11 July 2006	1.1.1	SURFshare	Few typos are removed.
10 July 2006	1.1	SURFshare	Extension with: Version numbering and information Complete namespace declaration in 'metadata'-item. The three Items are not case sensitively discriminated by: metadata, objects and jump-off-page. Extended explanation about the use of Namespace-declarations.
30 March 2006	1.0	SURFshare	Initial document
	0.4	NEEO	Some minor editorial changes 3.3.2 - Object File Item Addition of deposit date as a <dcterms:issued> Vocabulary for <dcterms:accessRights>
	0.3	NEEO	Only minor changes
	0.2	NEEO	One or more object files is changed in zero, one or more object files Removed example; has to be replaced by a new example.
	0.1	NEEO	Changes with respect to version 2.3.1 of "MPEG21 DIDL Document Specifications for repositories" by Maurice Vanderfeesten (SURF) Relaxed the requirement that the top Item identifier must be persistent. More strict formulation for Item identifiers not being the same as the OAI identifier and the DIDL document identifier. Replaced dip:objectType by rdf:type. The use of simple Dublin Core is not mandatory and is not even recommended. MODS is the recommended metadata scheme. Left out all references to 'work' or 'expression'. Item elements stand for Digital Items (they are Digital Item Declarations). Type statements (using rdf:type) type the Digital Items. The use of identifiers (URIs) for Digital Items is mandatory. Added new semantics: publishedVersion\|authorVersion, embargo, description, access rights.

...

The DIDL document is a document with one top-level Item element. The Item contains several child Item elements. These child Item elements describe three different types: descriptive metadata, object files and jump-off pages. Between brackets the cardinality of the XML elements are shown:

Code Block
<metadata> \\ <didl:DIDL ...> \\ <didl:Item> \\ <didl:Item>...</didl:Item> \\ <didl:Item>...</didl:Item> \\ <didl:Item>...</didl:Item> \\ </didl:Item> \\ </didl:DIDL> \\ </metadata> \\ \\ \\

Item Descriptors

Item Descriptors provide information about the Digital Item. A Descriptor contains a Statement with information about the Item. For each "statement" a new Descriptor is used.
The top level Item element MUST contain two Descriptor elements. One Descriptor element for the (Persistent) Identifier and one Descriptor element for the modification date.

...

Example on level one

Code Block

	xml
	xml

<didl:DIDL ...> \\
 <didl:Item> \\
 <didl:Descriptor>...</didl:Descriptor> <\!\--Identification, mandatory-\-> \\
 <didl:Descriptor>...</didl:Descriptor> <\!\--Modification date, mandatory-\-> \\
 <didl:Item>...</didl:Item> \\
 <didl:Item>...</didl:Item> \\
 <didl:Item>...</didl:Item> \\
 ... \\
 </didl:Item> \\
 </didl:DIDL> \\ \\
\\

Example on level two

Object type added

Code Block

	xml
	xml

<didl:DIDL ...> \\
 <didl:Item> \\
 <didl:Item> \\
 <didl:Descriptor>...</didl:Descriptor> <\!\--Identification, mandatory-\-> \\
 <didl:Descriptor>...</didl:Descriptor> <\!\--Modification date, optional-\-> \\
 <didl:Descriptor>...</didl:Descriptor> <\!--\--Type, mandatory-\-> \\
 ... \\
 </didl:Item> \\
 <didl:Item>...</didl:Item> \\
 <didl:Item>...</didl:Item> \\
 <didl:Item>...</didl:Item> \\
 ... \\
 </didl:Item> \\
 </didl:DIDL> \\ \\
\\

Apart from the Identifier, modified date and type, Descriptors with other semantic content can be used, see section 3.2.

...

In this example the root Item has a Persistent Identifier.

Wiki Markup

The identifier MUST be an URI. Some repositories can make use of registered URIs, e.g., in the Netherlands the repositories can make use of National Bibliography Numbers. If a repository doesn't have access to registered URIs, UUIDs or TAGs can be used. More information about UUIDs can be found at \[http://en.wikipedia<ac:structured-macro ac:name="anchor" ac:schema-version="1" ac:macro-id="7f528d6f8ea53477-31082570-484f4750-b1c3be6f-0757ce018ab3d2460980a17c"><ac:parameter ac:name="">_Hlt190750088</ac:parameter></ac:structured-macro><ac:structured-macro ac:name="anchor" ac:schema-version="1" ac:macro-id="a24b00291089713c-115aa04b-41654da1-b169987c-f048fd48893456c83813b639"><ac:parameter ac:name="">_Hlt190750089</ac:parameter></ac:structured-macro>.org/wiki/UUID\|http://en.wikipedia.org/wiki/UUID\] and for TAGs the best starting point is [http://www.taguri.org/|http://www.taguri.org/]. TAGs for the repository of Tilburg University could be constructed in the following way. All TAGs start with 'tag:uvt.nl,<year>:<record id>'. <year> is the year that the compound object entered the repository. The URIs for MODS records can look like 'tag:uvt.nl,<year>:<record id>/mods'  and the URIs for object files can look like 'tag:uvt.nl,<year>:<record id>/<file id>'.

The identifiers of the root Item and the second level Item elements SHOULD NOT be equal to the OAI identifier or the DIDL document identifier.
Identifiers should not change. Different identifier implies a different object.
The namespace for dii SHOULD be declared in the DIDL tag.

...

Code Block

	xml
	xml

 <didl:DIDL ...>
<didl:Item>
<didl:Item>...</didl:Item> <\!-\- metadata \-->
<didl:Item>...</didl:Item> <\!-\- object files \-->
<didl:Item>...</didl:Item> <\!-\- jump-off-page \-->
</didl:Item>
</didl:DIDL>

...

Code Block

	xml
	xml

 <didl:Item>

<didl:Item> <\!-\--one or many occurrences-\->
<didl:Descriptor>
<didl:Statement mimeType="application/xml">
<rdf:type rdf:resource="info:eu-repo/semantics/descriptiveMetadata" />
</didl:Statement>
</didl:Descriptor>
...
</didl:Item>

<didl:Item>    <\!-\--zero or many occurrences-\->
<didl:Descriptor>
<didl:Statement mimeType="application/xml">
<rdf:type rdf:resource="info:eu-repo/semantics/objectFile" />
</didl:Statement>
</didl:Descriptor>
...
</didl:Item>

<didl:Item> <\!-\--zero or one occurrences-\->
<didl:Descriptor>
<didl:Statement mimeType="application/xml">
<rdf:type rdf:resource="info:eu-repo/semantics/humanStartPage" />
</didl:Statement>
</didl:Descriptor>
...
</didl:Item>

</didl:Item>

...

Code Block

	xml
	xml
collapse	true

 <didl:Item>
<didl:Descriptor>
<didl:Statement mimeType="application/xml">
<rdf:type rdf:resource="info:eu-repo/semantics/descriptiveMetadata" />
</didl:Statement>
</didl:Descriptor>
<didl:Descriptor> <\!-\- This metadata instance has its own ID number \-->
<didl:Statement mimeType="application/xml">
<dii:Identifier>urn:nbn:nl:ui:13-74836724783</dii:Identifier>
</didl:Statement>
</didl:Descriptor>
<didl:Descriptor> <\!-\- This record has its own Modification date \-->
<didl:Statement mimeType="application/xml">
<dcterms:modified>2006-12-20T10:29:12Z</dcterms:modified>
</didl:Statement>
</didl:Descriptor>
<didl:Component>
<didl:Resource mimeType="application/xml"> <\!-\- the MODS data \-->
<mods:mods
xmlns:mods="http://www.loc.gov/mods/v3"
xsi:schemaLocation=
"http://www.loc.gov/mods/v3
[http://www.loc.gov/standards/mods/v3/mods-3-3.xsd]">
<mods:titleInfo>...</mods:titleInfo>
<mods:name>...</mods:name>
<mods:typeOfResource> ... </mods:typeOfResource>
...
</mods:mods>
</didl:Resource>
</didl:Component>
</didl:Item>

...

Code Block

	xml
	xml
collapse	true

<didl:Item>
...

<\!-\- Below this line one can find links to one or more digital objects \-->
<didl:Item> <\!-\- First Item for a File/Bitstream \-->
<didl:Descriptor>
<didl:Statement mimeType="application/xml">
<rdf:type rdf:resource="info:eu-repo/semantics/objectFile" />
</didl:Statement>
</didl:Descriptor>
<didl:Descriptor> <\!-\- This Object Item has its own persistent ID \-->
<didl:Statement mimeType="application/xml">
<dii:Identifier>urn:nbn:nl:ui:13-36724783</dii:Identifier>
</didl:Statement>
</didl:Descriptor>
<didl:Descriptor> <\!-\- This Item has its own Modification date \-->
<didl:Statement mimeType="application/xml">
<dcterms:modified>2006-12-20T10:29:12Z</dcterms:modified>
</didl:Statement>
</didl:Descriptor>

<didl:Component>
<didl:Resource
mimeType="application/pdf"
ref="http://my.server.nl/report.pdf"/>
</didl:Component>
</didl:Item>

<didl:Item> <\!-\- Second Item for a File/Bitstream \-->
<didl:Descriptor>
<didl:Statement mimeType="application/xml">
<rdf:type rdf:resource="info:eu-repo/semantics/objectFile" />
</didl:Statement>
</didl:Descriptor>
<didl:Descriptor> <\!-\- This Object Item has its own persistent ID \-->
<didl:Statement mimeType="application/xml">
<dii:Identifier>urn:nbn:nl:ui:13-36724784</dii:Identifier>
</didl:Statement>
</didl:Descriptor>
<didl:Descriptor> <\!-\- This Item has its own Modification date \-->
<didl:Statement mimeType="application/xml">
<dcterms:modified>2006-12-20T10:29:12Z</dcterms:modified>
</didl:Statement>
</didl:Descriptor>
<didl:Descriptor> <\!-\- this file is the appendix \-->
<didl:Statement mimeType="application/xml">
<dc:description>Appendix</dc:description>
</didl:Statement>
</didl:Descriptor>
...
<didl:Component>
<didl:Resource
mimeType="application/pdf"
ref="http://my.server.nl/appendix.pdf"/>
</didl:Component>
</didl:Item>

<didl:Item> <\!-\- Third Item for a File/Bitstream \-->
<didl:Descriptor>
<didl:Statement mimeType="application/xml">
<rdf:type rdf:resource="info:eu-repo/semantics/objectFile" />
</didl:Statement>
</didl:Descriptor>
<didl:Descriptor> <\!-\- This Object Item has its own persistent ID \-->
<didl:Statement mimeType="application/xml">
<dii:Identifier>urn:nbn:nl:ui:13-36724785</dii:Identifier>
</didl:Statement>
</didl:Descriptor>
<didl:Descriptor> <\!-\- This Item has its own Modification date \-->
<didl:Statement mimeType="application/xml">
<dcterms:modified>2006-12-20T10:29:12Z</dcterms:modified>
</didl:Statement>
</didl:Descriptor>
<didl:Descriptor> <\!-\--\- deposit date \-->
<didl:Statement mimeType="application/xml">
<dcterms:issued>2010-12-01</dcterms:issued>
</didl:Statement>
</didl:Descriptor>
<didl:Descriptor> <\!-\--\- embargo on file \-->
<didl:Statement mimeType="application/xml">
<dcterms:available>2010-12-01</dcterms:available>
</didl:Statement>
</didl:Descriptor>
...
<didl:Component>
<didl:Resource
mimeType="application/pdf"
ref="http://my.server.nl/datasheets.xls"/>
</didl:Component>
</didl:Item>
</didl:Item>

...

Code Block

	xml
	xml
collapse	true

<didl:Item>
...

<\!-\- Below this line; an Item with a link to one optional Intermediate page \-->
<didl:Item>
<didl:Descriptor>
<didl:Statement mimeType="application/xml">
<rdf:type rdf:resource="info:eu-repo/semantics/humanStartPage" />
</didl:Statement>
</didl:Descriptor>
...
<didl:Component>
<didl:Resource
mimeType="text/html"
ref="http://my.server.nl/mypub.html"/>
</didl:Component>
</didl:Item>
</didl:Item>

...

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