Impact assessment for indexing elements

Indexing elements proposals:
 
- #45 Add See, See Also indexing elements
 
http://www.oasis-open.org/committees/download.php/17291/IssueNumber45.ht
ml 
 
- #45a Add sort order ("sort as") indexing elements
 
http://www.oasis-open.org/committees/download.php/17290/IssueNumber45a.h
tml 
 
- #45b Add page range indexing elements
 
http://www.oasis-open.org/committees/download.php/17289/IssueNumber45b.h
tml
 
Architectural spec impact
-------------------------

None. The architectural spec does not discuss indexing. Unless we want
to add a new topic on indexing, there is no impact from these proposals.

Language spec impact
--------------------

Add new elements to the reference:

	index-base
	index-see
	index-see-also
	index-sort-as
	index-range-start
	index-range-end

Links to these new topics would go into a new indexing domain section in


http://docs.oasis-open.org/dita/v1.0/langspec/ditaref-type.toc.html 

and in their respective alphabetical location in 

http://docs.oasis-open.org/dita/v1.0/langspec/ditaref-alpha.toc.html

The existing indexterm element's content model will need to be updated
to reflect these new elements.