DITA 1.2 small feature -- mapgroup domain additions

[Erik Hennum <ehennum@us.ibm.com>]

Hi, Esteemed TC:

Not to overload the boat, but as Robert Anderson mentioned, I've a couple of small fry for the net:

1. Extend the topicgroup domain with some additional conveniences including:

<mapref> -- specializes <topicref> to set a format="ditamap" default for more intuitive map references

<topicset> -- specializes <topicref> to set a chunk="select–branch" default and required id attribute to make it easy to delimit standalone, reusable collections of content within a map (such as lessons within a course or large tasks explained by a collection of discrete task topics).

<topicsetref> -- specializes <topicref> to set format="ditamap" and type="branch" defaults for a reference to a <topicset> to enable reuse of small collections within a map (especially for task composition approaches in which multiple larger task collections reuse smaller component task collections).

<anchorref> -- specializes <topicref> to set format="ditamap" and type="anchor" defaults for a reference to an <anchor> to enable push of collections of content smaller than a map onto an anchor.

2.  Add a <relrowheader> alternative to <relheader> that has the same structure as <relrow>, allowing the use of <topicref> elements in the reltable header to provide references to resources that indicate the semantic of columns or of the relationship between columns.  Default processing is merely to get the heading if possible from the navtitle / title. 


Hoping that's useful,


Erik Hennum
ehennum@us.ibm.com