Re: Input to Best Practice 18: Assign unique identifiers to text items when possible

Felix Sasaki wrote:

> We should align this formulation
> "Your DTD or schema should provide xml:id (or an equivalent mechanism)"
> with BP 9, e.g. like:
> "Your DTD or schema should provide xml:id (or a different attribute to
> be of type ID)"

We might even consider using more general statement like:

Your DTD or schema should provide xml:id (or different means for
assigning unique identifier to each element)

Using ID type might be limiting due its limited lexical space. Some
schemas could use more complex or compound identifiers defined by
xs:unique/xs:key.

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