From Bjoern Hassler

Contents 1 Description of abstract element: ID 2 Discussion of id [add to discussion,edit discussion] 2.1 Do we need multiple identifiers? 3 Expression of id in various schemes 4 Edit properties [Edit properties]

[edit] 1 Description of abstract element: ID

The identifier of the resource. Recommended best practice is to identify the resource by means of a string conforming to a formal identification system

2 Discussion of id [add to discussion,edit discussion]

[edit] 2.1 Do we need multiple identifiers?

One of the problems is that the identifiers may be local, in that sense we have a problem using an rss:guid ar an atom:id in this place. So we may need an <o:id domain="..."></o:id> type element. I.e. if a feed from ETH gets aggregated, the aggregator might have "ETH-123456" as id for the element, but ETH may have 123456

<rss:guid>ETH-123456</rss:guid>
<o:id domain="ETH">123456</o:id>

(of course the two ids may be completely unrelated).

OAS: This neatly leads to the question whether persistent identifiers could be (one of) the identifiers: At least in the DOI world, a local prefix is part of the string. On the issue of having two (or more) ID, it certainly plays a role whether you work with a local handle and/or a registered one like DOI.

3 Expression of id in various schemes

As xml in eth/rss/atom:

<Dc:identifier>content for id</Dc:identifier>
<Rss:guid IsPermaLink="false">content for id</Rss:guid>
<Atom:id>content for id</Atom:id>

Full table:

name	number	MH xml	ETH xml
ID	11	Dc:identifier	Dc:identifier

RSS	attributes	Atom	attr	yahoo media	attr	iTunesU	attr	OpenCast	attr
Rss:guid	IsPermaLink="false"	Atom:id		-		-		-

VirtPresenter	ELAN AP	SURF media	ARCA	IEEE LOM	MPEG7
Object id, series id	Identifier	-	-	-	-

Obligation	Human readable type	data type	Encoding	URI DC term	Body
1-n	-	Text	1. handle, 2. DOI	Http://purl.org/dc/terms/identifier

[edit] 4 Edit properties [Edit properties]

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