J Morris created XERCESJ-1726:
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             Summary: Possible Bug: Xerces 2.12.1 for XML Validation with XSD 
1.1 Schema under Java
                 Key: XERCESJ-1726
                 URL: https://issues.apache.org/jira/browse/XERCESJ-1726
             Project: Xerces2-J
          Issue Type: Bug
          Components: Samples
    Affects Versions: 2.12.1
         Environment: Windows 7
Java 1.8.0_261
Xerces-J 2.12.1
            Reporter: J Morris
             Fix For: 2.12.1
         Attachments: testX.zip

I have recently been trying to validate the XML file *test1.xml* with a schema 
*test.xsd* containing *assert*/*assertion* constructs, using the sample program 
*jaxp.SourceValidator*.
Unexpectedly, the result was several reported errors in what appeared to be 
syntactically correct and valid XML lines (*test1.xml*: 9 errors).
After significant experimentation, it appeared that these errors were occurring 
at line numbers which the validation found troublesome. Inserting an extra line 
at one of the troublesome line numbers made the previously erroneous line (now 
*not* appearing at a troublesome line number) pass validation. On the other 
hand, the newly inserted line (occupying the troublesome line number) would 
fail validation.
I tentatively interpreted this as meaning that *the validation errors were not 
real* and began to try to develop a test-case, as similar as possible to 
*test1.xml*, but which passed validation. The result was *test2.xml*, which was 
generated from *test1.xml* by inserting XML comment lines at each of the 
troublesome line numbers, thereby displacing the previously erroneous lines to 
non-trooublesome line numbers. Since XML comment lines do not require 
validation, this file passed validation for me (*test2.xml*: 0 errors).
I then contacted Mukul GANDHI and he re-ran my validations *but came to a 
different result*. He saw errors in both XML files (*test1.xml*: 9 errors; 
*test2.xml*: 18 errors). Despite our joint efforts to achieve convergence 
between our respective validation runs, we have not so far succeeded.
Mukul did point out a couple of things:
1) The way that I was using the "matches" function in the *assert* constructs. 
His experience suggested that this was unreliable. However, I was not certain 
whether this would have led to the type of behaviour that I was seeing 
(apparent troublesome line numbers).
2) He found that certain characters (probably the two accented French 
characters) in my XML files were not supported in the default XML encoding 
scheme, UTF-8. However, for me, no errors were reported for those by the 
validation program *jaxp.SourceValidator*.

I would be very gratefull foe some help in getting to the bottom of this (both 
the original behaviour and the discrepancies with Mukul's validation runs).



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