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XML::LibXML::Element(3User Contributed Perl DocumentatiXML::LibXML::Element(3)

NAME
       XML::LibXML::Element - XML::LibXML Class for Element Nodes

SYNOPSIS
         use XML::LibXML;
         # Only methods specific to Element nodes are listed here,
         # see XML::LibXML::Node manpage for other methods

         $node = XML::LibXML::Element->new( $name );
         $node->setAttribute( $aname, $avalue );
         $node->setAttributeNS( $nsURI, $aname, $avalue );
         $avalue = $node->getAttribute( $aname );
         $avalue = $node->setAttributeNS( $nsURI, $aname );
         $attrnode = $node->getAttributeNode( $aname );
         $attrnode = $node->getAttributeNodeNS( $namespaceURI, $aname );
         $node->removeAttribute( $aname );
         $node->removeAttributeNS( $nsURI, $aname );
         $boolean = $node->hasAttribute( $aname );
         $boolean = $node->hasAttributeNS( $nsURI, $aname );
         @nodes = $node->getChildrenByTagName($tagname);
         @nodes = $node->getChildrenByTagNameNS($nsURI,$tagname);
         @nodes = $node->getChildrenByLocalName($localname);
         @nodes = $node->getElementsByTagName($tagname);
         @nodes = $node->getElementsByTagNameNS($nsURI,$localname);
         @nodes = $node->getElementsByLocalName($localname);
         $node->appendWellBalancedChunk( $chunk );
         $node->appendText( $PCDATA );
         $node->appendTextNode( $PCDATA );
         $node->appendTextChild( $childname , $PCDATA );
         $node->setNamespace( $nsURI , $nsPrefix, $activate );
         $node->setNamespaceDeclURI( $nsPrefix, $newURI );
         $node->setNamespaceDeclPrefix( $oldPrefix, $newPrefix );

METHODS
       The class inherits from XML::LibXML::Node. The documentation for
       Inherited methods is not listed here.

       Many functions listed here are extensively documented in the DOM Level
       3 specification (http://www.w3.org/TR/DOM-Level-3-Core/
       <http://www.w3.org/TR/DOM-Level-3-Core/>). Please refer to the
       specification for extensive documentation.

       new
             $node = XML::LibXML::Element->new( $name );

           This function creates a new node unbound to any DOM.

       setAttribute
             $node->setAttribute( $aname, $avalue );

           This method sets or replaces the node's attribute $aname to the
           value $avalue

       setAttributeNS
             $node->setAttributeNS( $nsURI, $aname, $avalue );

           Namespace-aware version of "setAttribute", where $nsURI is a
           namespace URI, $aname is a qualified name, and $avalue is the
           value. The namespace URI may be null (empty or undefined) in order
           to create an attribute which has no namespace.

           The current implementation differs from DOM in the following
           aspects

           If an attribute with the same local name and namespace URI already
           exists on the element, but its prefix differs from the prefix of
           $aname, then this function is supposed to change the prefix
           (regardless of namespace declarations and possible collisions).
           However, the current implementation does rather the opposite. If a
           prefix is declared for the namespace URI in the scope of the
           attribute, then the already declared prefix is used, disregarding
           the prefix specified in $aname. If no prefix is declared for the
           namespace, the function tries to declare the prefix specified in
           $aname and dies if the prefix is already taken by some other
           namespace.

           According to DOM Level 2 specification, this method can also be
           used to create or modify special attributes used for declaring XML
           namespaces (which belong to the namespace
           "http://www.w3.org/2000/xmlns/" and have prefix or name "xmlns").
           This should work since version 1.61, but again the implementation
           differs from DOM specification in the following: if a declaration
           of the same namespace prefix already exists on the element, then
           changing its value via this method automatically changes the
           namespace of all elements and attributes in its scope. This is
           because in libxml2 the namespace URI of an element is not static
           but is computed from a pointer to a namespace declaration
           attribute.

       getAttribute
             $avalue = $node->getAttribute( $aname );

           If $node has an attribute with the name $aname, the value of this
           attribute will get returned.

       getAttributeNS
             $avalue = $node->setAttributeNS( $nsURI, $aname );

           Retrieves an attribute value by local name and namespace URI.

       getAttributeNode
             $attrnode = $node->getAttributeNode( $aname );

           Retrieve an attribute node by name. If no attribute with a given
           name exists, "undef" is returned.

       getAttributeNodeNS
             $attrnode = $node->getAttributeNodeNS( $namespaceURI, $aname );

           Retrieves an attribute node by local name and namespace URI. If no
           attribute with a given localname and namespace exists, "undef" is
           returned.

       removeAttribute
             $node->removeAttribute( $aname );

           The method removes the attribute $aname from the node's attribute
           list, if the attribute can be found.

       removeAttributeNS
             $node->removeAttributeNS( $nsURI, $aname );

           Namespace version of "removeAttribute"

       hasAttribute
             $boolean = $node->hasAttribute( $aname );

           This function tests if the named attribute is set for the node. If
           the attribute is specified, TRUE (1) will be returned, otherwise
           the return value is FALSE (0).

       hasAttributeNS
             $boolean = $node->hasAttributeNS( $nsURI, $aname );

           namespace version of "hasAttribute"

       getChildrenByTagName
             @nodes = $node->getChildrenByTagName($tagname);

           The function gives direct access to all child elements of the
           current node with a given tagname, where tagname is a qualified
           name, that is, in case of namespace usage it may consist of a
           prefix and local name. This function makes things a lot easier if
           one needs to handle big data sets. A special tagname '*' can be
           used to match any name.

           If this function is called in SCALAR context, it returns the number
           of elements found.

       getChildrenByTagNameNS
             @nodes = $node->getChildrenByTagNameNS($nsURI,$tagname);

           Namespace version of "getChildrenByTagName". A special nsURI '*'
           matches any namespace URI, in which case the function behaves just
           like "getChildrenByLocalName".

           If this function is called in SCALAR context, it returns the number
           of elements found.

       getChildrenByLocalName
             @nodes = $node->getChildrenByLocalName($localname);

           The function gives direct access to all child elements of the
           current node with a given local name. It makes things a lot easier
           if one needs to handle big data sets. A special "localname" '*' can
           be used to match any local name.

           If this function is called in SCALAR context, it returns the number
           of elements found.

       getElementsByTagName
             @nodes = $node->getElementsByTagName($tagname);

           This function is part of the spec. It fetches all descendants of a
           node with a given tagname, where "tagname" is a qualified name,
           that is, in case of namespace usage it may consist of a prefix and
           local name. A special "tagname" '*' can be used to match any tag
           name.

           In SCALAR context this function returns a XML::LibXML::NodeList
           object.

       getElementsByTagNameNS
             @nodes = $node->getElementsByTagNameNS($nsURI,$localname);

           Namespace version of "getElementsByTagName" as found in the DOM
           spec. A special "localname" '*' can be used to match any local name
           and "nsURI" '*' can be used to match any namespace URI.

           In SCALAR context this function returns a XML::LibXML::NodeList
           object.

       getElementsByLocalName
             @nodes = $node->getElementsByLocalName($localname);

           This function is not found in the DOM specification. It is a mix of
           getElementsByTagName and getElementsByTagNameNS. It will fetch all
           tags matching the given local-name. This allows one to select tags
           with the same local name across namespace borders.

           In SCALAR context this function returns a XML::LibXML::NodeList
           object.

       appendWellBalancedChunk
             $node->appendWellBalancedChunk( $chunk );

           Sometimes it is necessary to append a string coded XML Tree to a
           node. appendWellBalancedChunk will do the trick for you. But this
           is only done if the String is "well-balanced".

           Note that appendWellBalancedChunk() is only left for compatibility
           reasons. Implicitly it uses

             my $fragment = $parser->parse_xml_chunk( $chunk );
              $node->appendChild( $fragment );

           This form is more explicit and makes it easier to control the flow
           of a script.

       appendText
             $node->appendText( $PCDATA );

           alias for appendTextNode().

       appendTextNode
             $node->appendTextNode( $PCDATA );

           This wrapper function lets you add a string directly to an element
           node.

       appendTextChild
             $node->appendTextChild( $childname , $PCDATA );

           Somewhat similar with "appendTextNode": It lets you set an Element,
           that contains only a "text node" directly by specifying the name
           and the text content.

       setNamespace
             $node->setNamespace( $nsURI , $nsPrefix, $activate );

           setNamespace() allows one to apply a namespace to an element. The
           function takes three parameters: 1. the namespace URI, which is
           required and the two optional values prefix, which is the namespace
           prefix, as it should be used in child elements or attributes as
           well as the additional activate parameter. If prefix is not given,
           undefined or empty, this function tries to create a declaration of
           the default namespace.

           The activate parameter is most useful: If this parameter is set to
           FALSE (0), a new namespace declaration is simply added to the
           element while the element's namespace itself is not altered.
           Nevertheless, activate is set to TRUE (1) on default. In this case
           the namespace is used as the node's effective namespace.  This
           means the namespace prefix is added to the node name and if there
           was a namespace already active for the node, it will be replaced
           (but its declaration is not removed from the document). A new
           namespace declaration is only created if necessary (that is, if the
           element is already in the scope of a namespace declaration
           associating the prefix with the namespace URI, then this
           declaration is reused).

           The following example may clarify this:

             my $e1 = $doc->createElement("bar");
              $e1->setNamespace("http://foobar.org", "foo")

           results

             <foo:bar xmlns:foo="http://foobar.org"/>

           while

             my $e2 = $doc->createElement("bar");
              $e2->setNamespace("http://foobar.org", "foo",0)

           results only

             <bar xmlns:foo="http://foobar.org"/>

           By using $activate == 0 it is possible to create multiple namespace
           declarations on a single element.

           The function fails if it is required to create a declaration
           associating the prefix with the namespace URI but the element
           already carries a declaration with the same prefix but different
           namespace URI.

       setNamespaceDeclURI
             $node->setNamespaceDeclURI( $nsPrefix, $newURI );

           EXPERIMENTAL IN 1.61 !

           This function manipulates directly with an existing namespace
           declaration on an element. It takes two parameters: the prefix by
           which it looks up the namespace declaration and a new namespace URI
           which replaces its previous value.

           It returns 1 if the namespace declaration was found and changed, 0
           otherwise.

           All elements and attributes (even those previously unbound from the
           document) for which the namespace declaration determines their
           namespace belong to the new namespace after the change.

           If the new URI is undef or empty, the nodes have no namespace and
           no prefix after the change. Namespace declarations once nulled in
           this way do not further appear in the serialized output (but do
           remain in the document for internal integrity of libxml2 data
           structures).

           This function is NOT part of any DOM API.

       setNamespaceDeclPrefix
             $node->setNamespaceDeclPrefix( $oldPrefix, $newPrefix );

           EXPERIMENTAL IN 1.61 !

           This function manipulates directly with an existing namespace
           declaration on an element. It takes two parameters: the old prefix
           by which it looks up the namespace declaration and a new prefix
           which is to replace the old one.

           The function dies with an error if the element is in the scope of
           another declaration whose prefix equals to the new prefix, or if
           the change should result in a declaration with a non-empty prefix
           but empty namespace URI.  Otherwise, it returns 1 if the namespace
           declaration was found and changed and 0 if not found.

           All elements and attributes (even those previously unbound from the
           document) for which the namespace declaration determines their
           namespace change their prefix to the new value.

           If the new prefix is undef or empty, the namespace declaration
           becomes a declaration of a default namespace. The corresponding
           nodes drop their namespace prefix (but remain in the, now default,
           namespace). In this case the function fails, if the containing
           element is in the scope of another default namespace declaration.

           This function is NOT part of any DOM API.

AUTHORS
       Matt Sergeant, Christian Glahn, Petr Pajas

VERSION
       1.70

COPYRIGHT
       2001-2007, AxKit.com Ltd.

       2002-2006, Christian Glahn.

       2006-2009, Petr Pajas.

perl v5.12.1                      2009-10-07           XML::LibXML::Element(3)
 

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Gedruckt am: 20.10.2017 01:44 GMT+0200 (2017-10-20T01:44:21+02:00)