Question about <navtitle> in <topicgroup> allowed by DITA 1.2

Hi everybody,

The DITA OT specification states this:

Beginning with DITA 1.2, you are able to specify a <navtitle> element 
within the <topicmeta> element inside of a <topicgroup>. The 
<topicgroup> element is meant as a non-titled grouping element, so 
adding a <navtitle> element to the <topicgroup> element has no defined 
purpose, and processors must ignore the title.

I know the construct is not illegal according to the schemas but is the 
construct illegal according to the DITA 1.2 specification?

> <topicgroup>
>     <topicmeta>
>       <navtitle>Navigation title</navtitle>
>     </topicmeta>
>   </topicgroup>

One of our users has such constructs and wants Oxygen XML Editor to 
display these titles for <topicgroup>s when editing the DITA Map in the 
DITA Maps Manager view (which shows a TOC-like outline of the DITA Map).

I know there has been an older discussion about this:

> https://lists.oasis-open.org/archives/dita/201008/msg00105.html

In your opinion what would be the best approach for an editor which 
shows the TOC-like structure of the DITA Map?

If the construct is not considered invalid by the spec (but more in a 
gray area) I guess we can make this improvement.

Regards,
Radu

Radu Coravu
<oXygen/>  XML Editor, Schema Editor and XSLT Editor/Debugger
http://www.oxygenxml.com

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