RE: [xliff] ID value type

During our meeting, yesterday, we discussed making the id consistently a
string rather than a NMTOKEN in a few cases and a string in others. I
suggested that the id was being used as a reference. As such, we may
want to keep it a NMTOKEN so that its reference can be a REFID. I also
said I would check on this.

In the 1.1 spec, in section 2.4, Inline Elements, the following bullet
point appears.

"* Use the xid attribute of the <bx/>, <ex/> and <x/> elements to
relate a <trans-unit> or <bin-unit> that contains the content of that
replaced code."

The xid attribute is defined as follows:

"Extern Reference identifier - The xid attribute is used to link an
inline element to a different <trans-unit> or <bin-unit> element. For
example, to link the text within a code to a corresponding translation
unit."
"Value description: The value of the referenced id.
"Default value: Undefined.
"Used in: <bpt>, <ept>, <it>, <ph>, <g>, <x/>, <bx/>, <ex/>, <sub>."

However, our posted schema represents the xid attribute, in all
instances, thusly:

<xsd:attribute name="xid" type="xsd:string" use="optional" />

Changing the schema to be consistent, either using NMTOKEN and REFID or
XSD:STRING for both would work.