XOM API for Processing XML with Java

["Michael Kay" <mike AT saxonica.com>]

> Section 4 of xml:id states:
> 
> An xml:id processor must assure that the following 
> constraints hold for 
> all xml:id attributes:
> 
>      * The normalized value of the attribute is an NCName 
> according to 
> the Namespaces in XML Recommendation which has the same 
> version as the 
> document in which this attribute occurs (NCName for XML 1.0, 
> or NCName 
> for XML 1.1).
> 

And it then says:

An xml:id error occurs for any xml:id attribute that does not satisfy the
constraints.

Having earlier said:

[Definition: An xml:id error is a non-fatal error that occurs when an xml:id
processor finds that a document has violated the constraints of this
specification.]

Section 6 further says:

A violation of the constraints in this specification results in an xml:id
error. Such errors are not fatal, but should be reported by the xml:id
processor. In the interest of interoperability, it is strongly recommended
that xml:id errors not be silently ignored.


So: it's clear as mud. The processor must "assure that" (assure whom?) the
value is an NCName, and it mustn't fail if it isn't.

Michael Kay