Content model for <ph> in LwDITA

This one might require a bit of discussion - I know how I'd prefer to resolve but not sure what the TC or LwDITA group would suggest.

The <ph> element has a different content model in maps and in topics. 

Topic model: 
(#PCDATA | ph | b | i | u | sup | sub | image | xref | data)* 
Map model: 
(#PCDATA | ph | b | i | u | sup | sub)* 

We should add <data> into the content models in maps, because <data> is already part of maps and we should keep these models as much alike as we can.

Maps do not currently allow <xref> or <image> so it's not currently possible to add them. I just want to note that this kind of quirk in DITA 1.0 and 1.1 occasionally caused minor trouble/frustration in authoring environments (copy/paste didn't work) and in tools (pulling a phrase into maps could result in bad content). If we do make the content models equal, it doesn't involve any new LwDITA elements, but it does mean adding 3 elements (image, alt, and xref) into maps.

The same issue applies to all of the phrase specializations that appear in both maps and topics: b, i, sub, sup, u.

Regards,
Robert D. Anderson 
DITA-OT lead and Co-editor DITA 1.3 specification,
Digital Services Group 

E-mail: 
Digital Services Group 

11501 BURNET RD,, TX, 78758-3400, AUSTIN, USA