<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="domattr.isid" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>DOMAttr::isId</refname>
  <refpurpose>
   Checks if attribute is a defined ID
  </refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis role="DOMAttr">
   <modifier>public</modifier> <type>bool</type><methodname>DOMAttr::isId</methodname>
   <void/>
  </methodsynopsis>
  <para>
   This function checks if the attribute is a defined ID.
  </para>
  <para>
   According to the DOM standard this requires a DTD which defines the 
   attribute ID to be of type ID. You need to validate your document with
   <xref linkend="domdocument.validate"/>
   or <literal>DOMDocument::validateOnParse</literal> before using this function.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  &no.function.parameters;
 </refsect1>
 
 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   &return.success;
  </para>
 </refsect1>
 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title>DOMAttr::isId() Example</title>
    <programlisting role="php">
<![CDATA[
<?php

$doc = new DomDocument;

// We need to validate our document before referring to the id
$doc->validateOnParse = true;
$doc->Load('book.xml');

// We retrieve the attribute named id of the chapter element
$attr = $doc->getElementsByTagName('chapter')->item(0)->getAttributeNode('id');

var_dump($attr->isId()); // bool(true)

?>
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>
</refentry>
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