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List:       xerces-j-dev
Subject:    RE: Puzzling error revisited
From:       "Don Smith" <donalds () isogen ! com>
Date:       2001-09-27 20:20:21
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John:

Strange. I can't track down what Xerces is unhappy about.

I did run both schemas through the Schema Quality Checker and it says both
are free from errors. Perhaps there's a bug in Xerces this has uncovered,
but I don't know what it would be.

Regards,

Don

Donald Smith
ISOGEN International

-----Original Message-----
From: John Powell [mailto:jpowell@sed.ara.com]
Sent: Thursday, September 27, 2001 9:54 AM
To: Xerces-J-User
Subject: Puzzling error revisited


Dear XERCES user's list,

I posted this question with no sample files a while ago because every time I
tried to simplify and narrow down the problem, the problem went away. I hope
the attached files are easy enough examples to debug.

Two schemas, amb.xsd and abc.xsd, and an instance file
test.xml are attached. When validation of the schema is performed
using Xerces version 1.4.3, Xerces provides the following error message:

[Error] test.xml:8:44: General Schema Error: Type : http://www.ara.com/abc,
DescriptionType does not derive from the type http://www.ara.com/abc,
#AnonType_No.

This error message is surprising because the elements "No" and
"DescriptionType" are
totally unrelated and the error implies that "DescriptionType" should derive
from the
element "No." If one deletes the line
       <xsd:element name="Description" type="xsd:string" minOccurs="0"/>
where Description is a subelement of element AM (see file AMB.xsd, line 14),
the error goes away. Yet this element has nothing to do with elements
DescriptionType or No.

The parser seems to behave as if there was a memory override causing the
error messaging system to produce a bizarre error. Can someone help me
figure this out?
Thanks

- John Powell
Applied Research Associates, Inc.

NOTES:
1)To check the above, you will have to modify the full or relative path to
schemas given in the files test.xml and abc.xsd to match the location of the
files on your computer.
2)I also used XSV to validate the instance and XSV does not give any error.
3)IBM Schema Quality Checker reports not errors with the two Schema files.





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