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validate schema

Posted on 2002-07-09
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Last Modified: 2013-11-19
I have a few schema files that validate except for the very first line:

<?xml version="1.0"?>

Yet this line is in many of the examples of schema files I see on the net.

The error is:
java.io.IOException: Problems occurred:Error on line 4 of document file:foo.xsd: The processing instruction target matching "[xX][mM][lL]" is not allowed.
at org.enhydra.validation.SchemaParser.parseSchema(SchemaParser.java:122)
at org.enhydra.validation.SchemaParser.<init>(SchemaParser.java:57)
at org.enhydra.validation.Validator.<init>(Validator.java:40)
at org.enhydra.validation.Validator.getInstance(Validator.java:68)
at ValidatorTest.main(ValidatorTest.java:20)

What is the problem?

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Question by:jdaues
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2 Comments
 
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Accepted Solution

by:
Wayne Bradney earned 50 total points
ID: 7158294
jdaues,

The answer would seem to lie here:

>>>> Error on line 4 of document file:foo.xsd
                  ^^^
The <?xml... ?> declaration is not strictly a Processing Instruction, it's Prolog, and MUST appear before any elements in the document (it should really be the first line/character encountered by the parser). Anywhere else in the document, "[xX][mM][lL]" is not allowed as a PI.

My guess is that the parser is seeing other text or blank lines before encountering the Prolog.

See the spec for more info at:

http://www.w3.org/TR/2000/REC-xml-20001006#sec-prolog-dtd

Regards,
WMB
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Author Comment

by:jdaues
ID: 7160053
The first 4 lines of the file were:

<!-- bla bla bla bla bla bla bla -->
<!-- bla bla bla bla bla bla bla -->
<!-- bla bla bla bla bla bla bla -->
<?xml version="1.0"?>

By simply placing the version line first, this corrects the problem:

<?xml version="1.0"?>
<!-- bla bla bla bla bla bla bla -->
<!-- bla bla bla bla bla bla bla -->
<!-- bla bla bla bla bla bla bla -->

I guess I was thinking the since the first 3 lines were comments, that it didn't matter.  But it does.

Thanks.
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