XML Validation

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+1 Q:

Hi,

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

+1 A:

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.

skaffman 2009-07-22 07:50:15

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?

2009-07-22 08:11:04

Make sure there's no whitespace or comments between the start of the the file and the start of the schema definition.

skaffman 2009-07-22 08:50:18

Thanks. Apart from whitespaces I was also using the .rng extension instead of .rnc. Using the right extension converted the RNG Schema to XSD.

2009-07-24 06:50:57

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

xav0989 2009-07-22 08:05:18

RNG is, however, an awful lot easier to write. It's a valid notion to write in RNG then convert to XSD later.

skaffman 2009-07-22 08:49:32

I should try it out then! I have some huge XSD to write...

xav0989 2009-07-22 13:10:36

Actually, make that RNC (RelaxNG Compact) is the easy one

skaffman 2009-07-24 07:31:38

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.

reinierpost 2009-07-22 08:14:11

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

Valentin Rocher 2009-07-22 11:34:30

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

http://stackoverflow.com/questions/1541253/how-to-validate-an-xml-document-using-a-relax-ng-schema-and-jaxp

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

Dr1Ku 2010-03-31 22:39:25

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