Further ODF elements using xml:id

[Svante Schubert <Svante.Schubert@Sun.COM>]

On the metadata call last week Patrick and I received the action item to 
evaluate, if further ODF elements are necessary for our metadata proposal.

Driven by Rob's scenario of metadata on a chart we identified the 
following elements:

    * chart:series - the different data series, often in different color
      in a graph
    * chart:axis - the axis of the chart
    * chart:data-point - points that create the graph

Metadata on the chart itself might be done in a various ways.
The chart is always in one content.xml file, with one chart:chart and 
one chart:plot-area.
I suggest to identify the chart by the IRI given to the content.xml of 
the chart in the metadata manifest.

@Rob: Would this satisfy your chart scenario you had in mind, Rob?

Further elements to attach metadata using xml:id are:

    * text:section - might contain any text content, e.g. various indices.
    * table:column - helpful for metadata on spreadsheets
    * table:row - helpful for metadata on spreadsheets

If you agree, I will add those six elements to our current draft.

Svante