XML Validation

Question

I want to validate an XML file against RELAXNG schema provided. Searching on the net gave me hints to create a Schema instance using SchemaFactory by providing the appropriate Schema Language. So as per my requirement I used:

SchemaFactory.newInstance(XMLConstants.RELAXNG_NS_URI);

But the following exception was thrown at run:

Exception in thread "main" java.lang.IllegalArgumentException: No SchemaFactory that implements the schema language specified by: http://relaxng.org/ns/structure/1.0 could be loaded
at javax.xml.validation.SchemaFactory.newInstance(SchemaFactory.java:207)

I am using Java6 and observed that only 'W3C_XML_SCHEMA_NS_URI' works. Rest all the schema URIs throws the similar exception.

I am fairly new to using the XML validation APIs. Can someone please provide me the appropriate usage in case I am not doing it correctly?

Thanks & Regards,
Keya

score 2 · Answer 1 · answered Jul 22 '09 at 07:50

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RNG is poorly supported in Java APIs, it never really got traction. I know of no Java API implementations that handle it. I suggest converting the schema to XML Schema (using Trang or similar) and then validating against that.

answered Jul 22 '09 at 07:50

skaffman

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Hi, Thanks for the reply. I used as you suggested Trang to convert the rng to xsd. But I get error running it. Following is the command with the error: $ java -jar trang.jar -I rng -O xsd config_schema.rng config_schema.xsd xml-validation/trang-20081028/config_schema.rng:1:1: fatal: Content is not allowed in prolog. $ Can you provide me some suggestion on the above error? – Jul 22 '09 at 08:11
Make sure there's no whitespace or comments between the start of the the file and the start of the schema definition. – skaffman Jul 22 '09 at 08:50
Thanks. Apart from whitespaces I was also using the .rng extension instead of .rnc. Using the right extension converted the RNG Schema to XSD. – Jul 24 '09 at 06:50

score 0 · Answer 2 · answered Jul 22 '09 at 08:05

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RNG is not supported as widely as XML Schema. You should always think of using XSD first.

answered Jul 22 '09 at 08:05

T0xicCode

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RNG is, however, an awful lot easier to write. It's a valid notion to write in RNG then convert to XSD later. – skaffman Jul 22 '09 at 08:49
Actually, make that RNC (RelaxNG Compact) is the easy one – skaffman Jul 24 '09 at 07:31

score 0 · Answer 3 · answered Jul 22 '09 at 08:14

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msv is in Java; I suppose it has a clear API you can use, but I've only ever used it on the command line and in scripts.

answered Jul 22 '09 at 08:14

reinierpost

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score 0 · Answer 4 · answered Jul 22 '09 at 11:34

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Kohsuke Kawaguchi apparently wrote a adapter library for jaxp to use a relaxng validator, see here and here

answered Jul 22 '09 at 11:34

Valentin Rocher

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score 0 · Answer 5 · edited May 23 '17 at 12:09

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I've had success in validating a document against a XML-based RelaxNG Schema using Java 6, check out :

How to validate an XML document using a RELAX NG schema and JAXP?

Don't know if it's relevant, just pointing out :-).

edited May 23 '17 at 12:09

Community

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answered Mar 31 '10 at 22:39

Dr1Ku

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XML Validation

5 Answers5