Re: [Exist-development] Metadata in eXist

[Joe W. <jo...@gm...>]

Very interesting discussion; I second all that Dan said about his use
cases.  Just a note on Adam's e-mail:

> The new user customisable metadata becomes a simple key value store
> and is indexed on document id and unique key name. Each value follows
> XQuery datatype rules and may be either an atomic value or a sequence.
>
> We then establish a metadata axis which is available in XQuery. From
> here we can use the standard predicates and update facilities of
> XQuery to maintain the metadata. The context of the metadata axis
> would always be the document root of the current node as metadata is
> on a per-document level, not a per-node level.

The metadata:: axis strikes me as similar in notion to the MarkLogic
property:: axis, although the latter stores metadata as an XML node
rather than key/value pair.  See:

http://docs.marklogic.com/4.1doc/docapp.xqy#display.xqy?fname=http://pubs/4.1doc/xml/dev_guide/properties.xml

I raise this as an existing implementation for comparison.

Joe