RE: [dita] Clarification needed on whether xml:lang is required

Concur on both points. This might have been written before the ATC got
started.

The attribute description at 3.4.1.6 "localization-atts attribute group"
punts to the XML spec. The XML spec doesn't talk about this as either
advice or requirement. It does give some interesting examples that DITA
specializers could consider, and that the ATC might elaborate.

Elsewhere in 2.1.3.9.1 "The @xml:lang attribute" we say that the top
element "should" set this attribute, and that applications "should"
ensure that this is done. Should we beef this up, Gershon? I think we
punted the "must" talk to the ATC.

	/B

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