QM Criterion for XML (QM v7.0)
Checks the translated XML document for its validity. On the one hand, the well-formedness of the XML document is checked. On the other hand, the XML document is checked against the underlying document type definition (DTD) or XML Schema definition (XSD) with which the XML document was checked in to Across. It is checked whether the rules defined in the DTD or XSD have been complied with.
In XML, a document is referred to as well-formed if it complies with the basic rules of the XML standard, e.g. correct tag nesting.
An XML document that is checked in to Across without DTD or XSD is only checked for well-formedness.
If defined as a mandatory criterion, the validity check will be conducted automatically upon completion of a task. However, you can also start it manually with CHECK ALL in crossView whenever you wish.
The validity check is always applied to the entire target document. The check stops at the first error found in the document. After this error is corrected, the validity check can be repeated in order to find any other errors in the document.
If you ignore a validation error instead of correcting it, the validation check will not continue after the ignored error if you run it anew. Instead, it will again stop at the same position. This can even go unnoticed in case you have hidden ignored errors. Click 
to display ignored errors, correct the error, and run the validation check anew.