In queries Constr-attr-id-2, Constr-compattr-id-2 and K2-ComputeConAttr-48, the error XQDY0091 may be raised.

After normalization and collapsing of whitespace, these attributes have value 'ab c d' - not valid NCNames.

"An implementation MAY raise a dynamic error if an xml:id error, as defined in [XML ID], is encountered during construction of an attribute named xml:id."

http://www.w3.org/TR/xml-id/#processing

"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)."

(: Name: Constr-attr-id 2 :)
(: Written by: Andreas Behm :)
(: Description: attribute xml:id - content is to be further normalized :)

<elem xml:id="    a{'b    c


d','        '}"/>