Catalogs: embedding version numbers

DITA includes OASIS 
catalogs as part of the standard. I propose for DITA 1.1 we somehow embed the 
version number in the catalogs so possibly incompatible DTDs from pre-1.0, 1.0 
and 1.1 can coexist. Right now, pre-1.0 and 1.0 can coexist in the same catalog 
because their public IDs differ, most notably in the change of owner from IBM to 
OASIS. I'd like to continue this pattern by adding version numbers to the DITA 
1.1 DTD files' public IDs. For example, concept.dtd from all three versions can 
sit in the same catalog like:

 

<public 
publicId="-//IBM//DTD DITA Concept//EN" 
uri="toolkit-1.3.2/concept.dtd"/>

<public 
publicId="-//OASIS//DTD DITA Concept//EN" 
uri="1.0/concept.dtd"/>

 

<public 
publicId="-//OASIS//DTD DITA Concept 1.1//EN" 
uri="1.1/concept.dtd"/>

 

We might want to embed 
the version number in the filename too, like concept11.dtd. This should bring us 
in line with other models like SVG.

 

Chris