# Xerces2 Implementation: Class IDREFDatatypeValidator

## org.apache.xerces.impl.dv.dtd
Class IDREFDatatypeValidator

    java.lang.Object
      |
      +--org.apache.xerces.impl.dv.dtd.IDREFDatatypeValidator

All Implemented Interfaces:
  DatatypeValidator

Direct Known Subclasses:
  XML11IDREFDatatypeValidator

public class IDREFDatatypeValidator
extends java.lang.Object
implements DatatypeValidator

IDREFDatatypeValidator - represents the IDREFS attribute type from XML 1.0 recommendation. The Value Space of IDREF is the set of all strings that match the NCName production and have been used in an XML Document as the value of an element or attribute of Type ID. The Lexical space of IDREF is the set of strings that match the NCName production.

The Value space of IDREF is scoped to a specific instance document

Version:
  $Id: IDREFDatatypeValidator.java,v 1.7 2003/06/05 21:51:32 neilg Exp $
Author:
  Jeffrey Rodriguez, IBM, Sandy Gao, IBM

Constructor Summary
`IDREFDatatypeValidator()`

Method Summary
`void` `validate(java.lang.String content, ValidationContext context)` Checks that "content" string is valid IDREF value.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### IDREFDatatypeValidator

    public IDREFDatatypeValidator()

Method Detail

### validate

    public void validate(java.lang.String content,
                         ValidationContext context)
                  throws InvalidDatatypeValueException

  Checks that "content" string is valid IDREF value. If invalid a Datatype validation exception is thrown.
  Specified by:
    `validate` in interface `DatatypeValidator`
  Parameters:
    `content` - the string value that needs to be validated
    `context` - the validation context
  Throws:
    `InvalidDatatypeException` - if the content is invalid according to the rules for the validators
  See Also:
    `InvalidDatatypeValueException`

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