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From "Heeg, Michael" <H...@fev.de>
Subject Strange problem with pattern (Xerces 2.5.0 crashes)
Date Thu, 15 Apr 2004 07:07:55 GMT
Hi,

I am using Xerces-C 2.5.0 in my MS Visual C++ application. When validating
XML files against a specified schema, the parser sometimes crashes with an
"unexpected exception". I found out that the reason for the crashes is the
following restriction of the schema (see "Body" element):

<xsd:complexType name="InputFileType">
	<xsd:sequence>
		<xsd:element name="Head" type="HeadType"/>
		<xsd:element name="Body">
			<xsd:simpleType>
				<xsd:restriction base="xsd:string">
					<xsd:pattern
value="(\n*[0-9]*,[0-9]*,(\-*[0-9]*\.*[0-9]*,)*\-*[0-9]+\.*[0-9]*;\n*)*"/>
				</xsd:restriction>
			</xsd:simpleType>
		</xsd:element>
	</xsd:sequence>
</xsd:complexType>

The restriction is defined to validate <Body> tags like the following:

<Body>
0,10,0.199,10.199,0.008;
1,20,0.389,20.389,0.059;
2,30,0.565,30.565,0.180;
3,40,0.717,40.717,0.369;
4,50,0.841,50.841,0.596;
5,60,0.932,60.932,0.810;
....
</Body>

The strange thing is: when the <Body> tag contains a large amount of data,
the validation of the restriction leads to the unexpected exception. But:
with a small amount of data, everything works fine. (Also: when I delete the
restriction from the schema, everything works fine.)

For me this looks like a Xerces bug?! Am I wrong? Any suggestions or
comments?

Best regards,
Michael


P.S.: I know that the way we use this <Body> tag is not the best way to
handle csv-like data, but I had to do this because of an existing file
format.

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