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XML::Mini::Element

Section: User Contributed Perl Documentation (3)
Updated: 2008-02-04
Index 

NAME

XML::Mini::Element - Perl implementation of the XML::Mini Element API. 

SYNOPSIS

        use XML::Mini::Document;                my $xmlDoc = XML::Mini::Document->new();                # Fetch the ROOT element for the document        # (an instance of XML::Mini::Element)        my $xmlElement = $xmlDoc->getRoot();                # Create an <?xml?> tag        my $xmlHeader = $xmlElement->header('xml');                # add the version to get <?xml version="1.0"?>        $xmlHeader->attribute('version', '1.0');                # Create a sub element        my $newChild = $xmlElement->createChild('mychild');                $newChild->text('hello mommy');                        # Create an orphan element                my $orphan = $xmlDoc->createElement('annie');                $orphan->attribute('hair', '#ff0000');        $orphan->text('tomorrow, tomorrow');                # Adopt the orphan        $newChild->appendChild($orphan);                        # ...        # add a child element to the front of the list         $xmlElement->prependChild($otherElement);                print $xmlDoc->toString();

The code above would output:

<?xml version=``1.0'' ?>
 <mychild>
  hello mommy
  <annie hair=``#ff0000''>
   tomorrow, tomorrow
  </annie>
 </mychild> 

DESCRIPTION

Although the main handle to the xml document is the XML::Mini::Document object,much of the functionality and manipulation involves interaction withElement objects.

A Element has:

 - a name - a list of 0 or more attributes (which have a name and a value) - a list of 0 or more children (Element or XML::MiniNode objects) - a parent (optional, only if MINIXML_AUTOSETPARENT > 0)
 

new NAME

Creates a new instance of XML::Mini::Element, with name NAME 

name [NEWNAME]

If a NEWNAME string is passed, the Element's name is set to NEWNAME.

Returns the element's name. 

attribute NAME [SETTO [SETTOALT]]

The attribute() method is used to get and set the Element's attributes (ie the name/value pairs containedwithin the tag, <tagname attrib1=``value1'' attrib2=``value2''>)

If SETTO is passed, the attribute's value is set to SETTO.

If the optional SETTOALT is passed and SETTO is false, the attribute's value is set to SETTOALT. This is usefull in caseswhen you wish to set the attribute to a default value if no SETTO ispresent, eg $myelement->attribute('href', $theHref, 'http://psychogenic.com')will default to 'http://psychogenic.com'.

Returns the value associated with attribute NAME. 

text [SETTO [SETTOALT]]

The text() method is used to get or append text data to thiselement (it is appended to the child list as a new XML::MiniNode object).

If SETTO is passed, a new node is created, filled with SETTO and appended to the list of this element's children.

If the optional SETTOALT is passed and SETTO is false, the new node's value is set to SETTOALT. See the attribute() methodfor an example use.

Returns a string composed of all child XML::MiniNodes' contents.

Note: all the children XML::MiniNodes' contents - including numeric nodes are included in the return string. 

numeric [SETTO [SETTOALT]]

The numeric() method is used to get or append numeric data tothis element (it is appended to the child list as a XML::MiniNode object).

If SETTO is passed, a new node is created, filled with SETTO and appended to the list of this element's children.

If the optional SETTOALT is passed and SETTO is false, the new node's value is set to SETTOALT. See the attribute() methodfor an example use.

Returns a space seperated string composed all child XML::MiniNodes' numeric contents.

Note: ONLY numerical contents are included from the list of child XML::MiniNodes. 

header NAME

The header() method allows you to add a new XML::Mini::Element::Header to this element's list of children.

Headers return a <? NAME ?> string for the element's toString() method. Attributesmay be set using attribute(), to create headers like<?xml-stylesheet href=``doc.xsl'' type=``text/xsl''?>

Valid XML documents must have at least an 'xml' header, like:<?xml version=``1.0'' ?>

Here's how you could begin creating an XML document:

        my $miniXMLDoc =  XML::Mini::Document->new();        my $xmlRootNode = $miniXMLDoc->getRoot();        my $xmlHeader = $xmlRootNode->header('xml');        $xmlHeader->attribute('version', '1.0');

This method was added in version 1.25. 

comment CONTENTS

The comment() method allows you to add a new XML::Mini::Element::Comment to thiselement's list of children.

Comments will return a <!-- CONTENTS --> string when the element's toString()method is called.

Returns a reference to the newly appended XML::Mini::Element::Comment 

docType DEFINITION

Append a new <!DOCTYPE DEFINITION [ ...]> element as a child of this element.

Returns the appended DOCTYPE element. You will normally use the returnedelement to add ENTITY elements, like

 my $newDocType = $xmlRoot->docType('spec SYSTEM "spec.dtd"'); $newDocType->entity('doc.audience', 'public review and discussion');
 

entity NAME VALUE

Append a new <!ENTITY NAME ``VALUE''> element as a child of this element.

Returns the appended ENTITY element. 

cdata CONTENTS

Append a new <![CDATA[ CONTENTS ]]> element as a child of this element.Returns the appended CDATA element. 

getValue

Returns a string containing the value of all the element'schild XML::MiniNodes (and all the XML::MiniNodes contained within it's child Elements, recursively). 

getElement NAME [POSITION]

Searches the element and it's children for an element with name NAME.

Returns a reference to the first Element with name NAME,if found, NULL otherwise.

NOTE: The search is performed like this, returning the first          element that matches:

 - Check this element's immediate children (in order) for a match. - Ask each immediate child (in order) to Element::getElement()  (each child will then proceed similarly, checking all it's immediate  children in order and then asking them to getElement())

If a numeric POSITION parameter is passed, getElement() will return the POSITIONth element of name NAME (starting at 1). Thus, on document

  <?xml version="1.0"?>  <people>   <person>    bob   </person>   <person>    jane   </person>   <person>    ralph   </person>  </people>

$people->getElement('person') will return the element containing the text node'bob', while $people->getElement('person', 3) will return the element containing the text 'ralph'. 

getElementByPath PATH [POSITIONSARRAY]

Attempts to return a reference to the (first) element at PATHwhere PATH is the path in the structure (relative to this element) tothe requested element.

For example, in the document represented by:

         <partRateRequest>          <vendor>           <accessid user="myusername" password="mypassword" />          </vendor>          <partList>           <partNum>            DA42           </partNum>           <partNum>            D99983FFF           </partNum>           <partNum>            ss-839uent           </partNum>          </partList>         </partRateRequest>        $partRate = $xmlDocument->getElement('partRateRequest');        $accessid = $partRate->getElementByPath('vendor/accessid');

Will return what you expect (the accessid element with attributes user = ``myusername''and password = ``mypassword'').

BUT be careful:        $accessid = $partRate->getElementByPath('partList/partNum');

will return the partNum element with the value ``DA42''. To access other partNum elements youmust either use the POSITIONSARRAY or the getAllChildren() method on the partRateRequest element.

POSITIONSARRAY functions like the POSITION parameter to getElement(), but instead of specifying theposition of a single element, you must indicate the position of all elements in the path. Therefore, toget the third part number element, you would use

        my $thirdPart = $xmlDocument->getElementByPath('partRateRequest/partList/partNum', 1, 1, 3);

The additional 1,1,3 parameters indicate that you wish to retrieve the 1st partRateRequest element in the document, the 1st partList child of partRateRequest and the 3rd partNum child of the partList element(in this instance, the partNum element that contains 'ss-839uent').

Returns the Element reference if found, NULL otherwise. 

getAllChildren [NAME]

Returns a reference to an array of all this element's Element children

Note: although the Element may contain XML::MiniNodes as children, these arenot part of the returned list. 

createChild ELEMENTNAME [VALUE]

Creates a new Element instance and appends it to the listof this element's children.The new child element's name is set to ELEMENTNAME.

If the optional VALUE (string or numeric) parameter is passed,the new element's text/numeric content will be set using VALUE.

Returns a reference to the new child element 

appendChild CHILDELEMENT

appendChild is used to append an existing Element object tothis element's list.

Returns a reference to the appended child element.

NOTE: Be careful not to create loops in the hierarchy, eg

 $parent->appendChild($child); $child->appendChild($subChild); $subChild->appendChild($parent);

If you want to be sure to avoid loops, set the MINIXML_AVOIDLOOPS defineto 1 or use the avoidLoops() method (will apply to all children added with createChild()) 

prependChild CHILDELEMENT

prependChild is used to add an existing Element object tothis element's list. The added CHILDELEMENT will be prepended to the list, thusit will appear first in the XML output.

Returns a reference to the prepended child element.

See the note about creating loops in the above appendChild() description. 

insertChild CHILDELEMENT INDEX

Inserts the child element at a specific location in this elements list of children.

If INDEX is larger than numChildren(), the CHILDELEMENT will be added to the end ofthe list (same as appendChild() ).

Returns the inserted child element. 

removeChild CHILDELEMENT

Removes the element CHILDELEMENT from the list of this element's children, if it is found within this list.

Returns the child element that was removed, else undef. 

removeAllChildren

Clears the element's list of child elements. Returns an array ref of child elements that were removed. 

remove

Removes this element from it's parent's list of children. The parent must be set for the element for this method to work - this can be done manually using the parent() method or automatically if $XML::Mini::AutoSetParent is true (set to false by default). 

parent NEWPARENT

The parent() method is used to get/set the element's parent.

If the NEWPARENT parameter is passed, sets the parent to NEWPARENT(NEWPARENT must be an instance of Element)

Returns a reference to the parent Element if set, NULL otherwise.

Note: This method is mainly used internally and you wouldn't normally needto use it.It get's called on element appends when $XML::Mini::AutoSetParent or $XML::Mini::AvoidLoops or avoidLoops() > 0 

avoidLoops SETTO

The avoidLoops() method is used to get or set the avoidLoops flag for this element.

When avoidLoops is true, children with parents already set can NOT be appended to anyother elements. This is overkill but it is a quick and easy way to avoid infinite loopsin the heirarchy.

The avoidLoops default behavior is configured with the $XML::Mini::AvoidLoops variable but can beset on individual elements (and automagically all the element's children) with the avoidLoops() method.

Returns the current value of the avoidLoops flag for the element. 

toString [SPACEOFFSET]

toString returns an XML string based on the element's attributes,and content (recursively doing the same for all children)

The optional SPACEOFFSET parameter sets the number of spaces to useafter newlines for elements at this level (adding 1 space per level indepth). SPACEOFFSET defaults to 0.

If SPACEOFFSET is passed as $XML::Mini::NoWhiteSpaces no \n or whitespaces will be inserted in the xml string(ie it will all be on a single line with no spaces between the tags.

Returns the XML string. 

createNode NODEVALUE

Private (?)

Creates a new XML::MiniNode instance and appends it to the listof this element's children.The new child node's value is set to NODEVALUE.

Returns a reference to the new child node.

Note: You don't need to use this method normally - it is usedinternally when appending text() and such data. 

appendNode CHILDNODE

appendNode is used to append an existing XML::MiniNode object tothis element's list.

Returns a reference to the appended child node.

Note: You don't need to use this method normally - it is usedinternally when appending text() and such data. 

AUTHOR

Copyright (C) 2002-2008 Patrick Deegan, Psychogenic Inc.

Programs that use this code are bound to the terms and conditions of the GNU GPL (see the LICENSE file). If you wish to include these modules in non-GPL code, you need prior written authorisation from the authors.

This library is released under the terms of the GNU GPL version 3, making it available only for free programs (``free'' here being used in the sense of the GPL, see http://www.gnu.org for more details). Anyone wishing to use this library within a proprietary or otherwise non-GPLed program MUST contact psychogenic.com to acquire a distinct license for their application. This approach encourages the use of free software while allowing for proprietary solutions that support further development. 

LICENSE

    XML::Mini::Element module, part of the XML::Mini XML parser/generator package.    Copyright (C) 2002-2008 Patrick Deegan    All rights reserved        XML::Mini is free software: you can redistribute it and/or modify    it under the terms of the GNU General Public License as published by    the Free Software Foundation, either version 3 of the License, or    (at your option) any later version.    XML::Mini is distributed in the hope that it will be useful,    but WITHOUT ANY WARRANTY; without even the implied warranty of    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the    GNU General Public License for more details.    You should have received a copy of the GNU General Public License    along with XML::Mini.  If not, see <http://www.gnu.org/licenses/>.

Official XML::Mini site: http://minixml.psychogenic.com

Contact page for author available on http://www.psychogenic.com/ 

SEE ALSO

XML::Mini, XML::Mini::Document

http://minixml.psychogenic.com


 

Index

NAME
SYNOPSIS
DESCRIPTION
new NAME
name [NEWNAME]
attribute NAME [SETTO [SETTOALT]]
text [SETTO [SETTOALT]]
numeric [SETTO [SETTOALT]]
header NAME
comment CONTENTS
docType DEFINITION
entity NAME VALUE
cdata CONTENTS
getValue
getElement NAME [POSITION]
getElementByPath PATH [POSITIONSARRAY]
getAllChildren [NAME]
createChild ELEMENTNAME [VALUE]
appendChild CHILDELEMENT
prependChild CHILDELEMENT
insertChild CHILDELEMENT INDEX
removeChild CHILDELEMENT
removeAllChildren
remove
parent NEWPARENT
avoidLoops SETTO
toString [SPACEOFFSET]
createNode NODEVALUE
appendNode CHILDNODE
AUTHOR
LICENSE
SEE ALSO

This document was created byman2html,using the manual pages.