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  <refentry id="function.xml-set-element-handler">
   <refnamediv>
    <refname>xml_set_element_handler</refname>
    <refpurpose>set up start and end element handlers</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
    <methodsynopsis>
     <type>bool</type><methodname>xml_set_element_handler</methodname>
     <methodparam><type>resource</type><parameter>parser</parameter></methodparam>
     <methodparam><type>callback</type><parameter>start_element_handler</parameter></methodparam>
     <methodparam><type>callback</type><parameter>end_element_handler</parameter></methodparam>
    </methodsynopsis>
    <para>
     Sets the element handler functions for the XML parser
     <parameter>parser</parameter>.
     <parameter>start_element_handler</parameter> and
     <parameter>end_element_handler</parameter> are strings containing
     the names of functions that must exist when
     <function>xml_parse</function> is called for
     <parameter>parser</parameter>.
    </para>
    <para>
     The function named by <parameter>start_element_handler</parameter>
     must accept three parameters:
     <methodsynopsis>
      <methodname><replaceable>start_element_handler</replaceable></methodname>
      <methodparam><type>resource</type><parameter>parser</parameter></methodparam>
      <methodparam><type>string</type><parameter>name</parameter></methodparam>
      <methodparam><type>array</type><parameter>attribs</parameter></methodparam>
     </methodsynopsis>
     <variablelist>
      <varlistentry>
       <term><parameter>parser</parameter></term> 
       <listitem>
        <simpara>
         The first parameter, <replaceable>parser</replaceable>, is a
         reference to the XML parser calling the handler.
        </simpara>
       </listitem>
      </varlistentry>
      <varlistentry>
       <term><parameter>name</parameter></term>
       <listitem>
        <simpara>
         The second parameter, <parameter>name</parameter>, contains the name
         of the element for which this handler is called.  If <link
         linkend="xml.case-folding">case-folding</link> is in effect for this
         parser, the element name will be in uppercase letters.
        </simpara>
       </listitem>
      </varlistentry>
      <varlistentry>
       <term><parameter>attribs</parameter></term>
       <listitem>
        <simpara>
         The third parameter, <parameter>attribs</parameter>, contains an
         associative array with the element's attributes (if any).  The keys
         of this array are the attribute names, the values are the attribute
         values.  Attribute names are <link
         linkend="xml.case-folding">case-folded</link> on the same criteria as
         element names.  Attribute values are <emphasis>not</emphasis>
         case-folded.
        </simpara>
        <simpara>
         The original order of the attributes can be retrieved by walking
         through <parameter>attribs</parameter> the normal way, using
         <function>each</function>.  The first key in the array was the first
         attribute, and so on.
        </simpara>
       </listitem>
      </varlistentry>
     </variablelist>
    </para>
    <para>
     The function named by <parameter>end_element_handler</parameter>
     must accept two parameters:
     <methodsynopsis>
       <methodname><replaceable>end_element_handler</replaceable></methodname>
       <methodparam><type>resource</type><parameter>parser</parameter></methodparam>
       <methodparam><type>string</type><parameter>name</parameter></methodparam>
     </methodsynopsis>
     <variablelist>
      <varlistentry>
       <term><parameter>parser</parameter></term> 
       <listitem>
        <simpara>
         The first parameter, <replaceable>parser</replaceable>, is a
         reference to the XML parser calling the handler.
        </simpara>
       </listitem>
      </varlistentry>
      <varlistentry>
       <term><parameter>name</parameter></term>
       <listitem>
        <simpara>
         The second parameter, <parameter>name</parameter>, contains the name
         of the element for which this handler is called.  If <link
         linkend="xml.case-folding">case-folding</link> is in effect for this
         parser, the element name will be in uppercase letters.
        </simpara>
       </listitem>
      </varlistentry>
     </variablelist>
    </para>
    <para>
     If a handler function is set to an empty string, or &false;, the handler
     in question is disabled.
    </para>
    <para>
     &true; is returned if the handlers are set up, &false; if
     <parameter>parser</parameter> is not a parser.
    </para>
    &note.func-callback;
   </refsect1>
  </refentry>

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