Public identifier for Publishers SC variants?

Based on the description in ch05
(http://www.docbook.org/tdg/en/html/ch05.html), our variant PI would
look something like:
-//OASIS//DTD DocBook V5.0-Based Variant For Publishers V1.0//EN

Any suggestions/changes? There may be other variants produced by the SC,
and could perhaps be handled as:
-//OASIS//DTD DocBook V5.0-Based Variant For Legal Publishers V1.0//EN
-//OASIS//DTD DocBook V5.0-Based Variant For Education Publishers V1.0//EN
-//OASIS//DTD DocBook V5.0-Based Variant For Medical Publishers V1.0//EN

Thoughts?

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Scott