Validation Module

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This XQuery Module contains functions to perform validations against DTDs, XML Schema and (since Version 8.3) RelaxNG:

  • For DTDs and XML Schema, Java’s standard validators is used.
  • For XML Schema, the Saxon XSLT ProcessorSaxonHE.jar, SaxonPE.jar, or SaxonEE.jar – is used if it is added to the classpath.
  • For RelaxNG, Jing must be added to the classpath. The latest version, jing-20091111.jar, is included in the full distributions of BaseX.
  • For Schematron validation, please check out Vincent Lizzi’s Schematron XQuery Module.

Conventions

All functions in this module are assigned to the http://basex.org/modules/validate namespace, which is statically bound to the validate prefix.
All errors are assigned to the http://basex.org/errors namespace, which is statically bound to the bxerr prefix.

Functions

validate:dtd

Signatures validate:dtd($input as item()) as empty-sequence()
validate:dtd($input as item(), $schema as xs:string) as empty-sequence()
Summary Validates the document specified by $input. $input can be specified as:
  • an xs:string, containing the path to the resource,
  • an xs:string, containing the resource in its string representation, or
  • a node(), containing the resource itself.

$schema can be used to specify the DTD for validation. If no DTD is given, $input is required to contain a DTD doctype declaration.

Errors BXVA0001: the validation fails.
BXVA0002: the validation process cannot be started.
BXVA0003: no DTD Schema validator is available.
Examples
  • validate:dtd('doc.xml', 'doc.dtd') validates the document doc.xml against the specified DTD file doc.dtd.
  • The following example validates an invalid document against a DTD, which is specified as string:
try {
  let $doc := <invalid/>
  let $schema := '<!ELEMENT root (#PCDATA)>'
  return validate:dtd($doc, $schema)
} catch bxerr:BXVA0001 {
  'DTD Validation failed.'
}

validate:dtd-info

Signatures validate:dtd-info($input as item()) as xs:string*
validate:dtd-info($input as item(), $schema as xs:string) as xs:string*
Summary Validates a document and returns warnings, errors and fatal errors in a string sequence. See validate:dtd for more details on the function arguments.
Errors BXVA0002: the validation process cannot be started.
BXVA0003: no DTD Schema validator is available.
Examples
  • validate:dtd-info(<invalid/>, '<!ELEMENT root (#PCDATA)>') returns:
    2:11: Element type "invalid" must be declared..

validate:dtd-report

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Signatures validate:dtd-report($input as item()) as element(report)
validate:dtd-report($input as item(), $schema as xs:string) as element(report)
Summary Validates a document and returns warnings, errors and fatal errors as XML. See validate:dtd for more details on the function arguments.
Errors BXVA0002: the validation process cannot be started.
BXVA0003: no DTD Schema validator is available.
Examples
  • validate:dtd-report(<invalid/>, '<!ELEMENT root (#PCDATA)>') returns:
<report>
  <status>invalid</status>
  <message level="Error" line="2" column="11">Element type "invalid" must be declared.</message>
</report>

validate:xsd

Signatures validate:xsd($input as item()) as empty-sequence()
validate:xsd($input as item(), $schema as item()) as empty-sequence()
Summary Validates the document specified by $input. Both $input and $schema can be specified as:
  • xs:string, containing the path to the resource,
  • xs:string, containing the resource in its string representation, or
  • node(), containing the resource itself.

$schema can be used to specify the schema for validation. If no schema is given, $input is required to contain an xsi:(noNamespace)schemaLocation attribute as defined in W3C XML Schema.

Errors BXVA0001: the validation fails.
BXVA0002: the validation process cannot be started.
BXVA0003: no XML Schema validator is available.
Examples
  • validate:xsd('doc.xml', 'doc.xsd') validates the document doc.xml against the specified schema doc.xsd.
  • The following example demonstrates how a document can be validated against a schema without resorting to local or remote URIs:
let $doc := <simple:root xmlns:simple='http://basex.org/simple'/>
let $schema :=
  <xs:schema xmlns:xs='http://www.w3.org/2001/XMLSchema' targetNamespace='http://basex.org/simple'>
    <xs:element name='root'/>
  </xs:schema>
return validate:xsd($doc, $schema)

validate:xsd-info

Signatures validate:xsd-info($input as item()) as xs:string*
validate:xsd-info($input as item(), $schema as item()) as xs:string*
Summary Validates a document and returns warnings, errors and fatal errors in a string sequence. See validate:xsd for more details on the function arguments.
Errors BXVA0002: the validation process cannot be started.
BXVA0003: no XML Schema validator is available.

validate:xsd-report

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Signatures validate:xsd-report($input as item()) as element(report)
validate:xsd-report($input as item(), $schema as xs:string) as element(report)
Summary Validates a document and returns warnings, errors and fatal errors as XML. See validate:xsd for more details on the function arguments.
Errors BXVA0002: the validation process cannot be started.
BXVA0003: no XML Schema validator is available.

validate:rng

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Signatures validate:rng($input as item(), $schema as item()) as empty-sequence()
validate:rng($input as item(), $schema as item(), $compact as xs:boolean) as empty-sequence()
Summary Validates the document specified by $input. The validation schema is specified by $schema, and $compact indicates if the schema uses the compact RelaxNG notation. Both $input and $schema can be specified as:
  • xs:string, containing the path to the resource,
  • xs:string, containing the resource in its string representation, or
  • node(), containing the resource itself.
Errors BXVA0001: the validation fails.
BXVA0002: the validation process cannot be started.
BXVA0003: the RelaxNG validator is not available.
Examples
  • validate:rng('doc.xml', 'doc.rng') validates the document doc.xml against the specified schema doc.rng.

validate:rng-info

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Signatures validate:rng-info($input as item(), $schema as item()) as xs:string*
validate:rng-info($input as item(), $schema as item(), $compact as xs:boolean) as xs:string*
Summary Validates a document and returns warnings, errors and fatal errors in a string sequence. See validate:rng for more details on the function arguments.
Errors BXVA0002: the validation process cannot be started.
BXVA0003: the RelaxNG validator is not available.

validate:rng-report

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Signatures validate:rng-report($input as item(), $schema as xs:string) as element(report)
validate:rng-report($input as item(), $schema as xs:string, $compact as xs:boolean) as element(report)
Summary Validates a document and returns warnings, errors and fatal errors as XML. See validate:rng for more details on the function arguments.
Errors BXVA0002: the validation process cannot be started.
BXVA0003: The RelaxNG validator is not available.

Errors

Code Description
BXVA0001 The document cannot be validated against the specified DTD or XML Schema.
BXVA0002 The validation cannot be started.
BXVA0003 No validator is available.

Changelog

Version 8.3
Version 7.6

The module was introduced with Version 7.3.