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<head><title>README file for xml2tree project </title></head>

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<h2><div align='center'>xml2tree </div></h2>
<div align='center'>Creating and manipulating XML tree objects in PHP</div>

<p> This README file documents the xml2tree package for php (4.0), ca. June
2000, by <a href="mailto:hide@address.com">Bill Softky</a> of <a
href="http://www.rsv.ricoh.com/aboutus/crc.html">Ricoh Silicon Valley</a>, as
an adjunct to Ricoh's Open Source web application initiative <a
href="http://www.risource.org">RiSource.org</a>.  It is covered by the <a
href="License.html">Ricoh Public Source Code License</a>.  As a work in
progress, there are no guarantee that it will do what you want, or even do what
it is supposed to (although suggestions and improvements are welcome).  The
tarfile for this project can be downloaded from <a href="ftp://www.risource.org/PIA/xml2tree.tar">here</a>.

<p> This project is effectively a library class for reading/writing/displaying
    XML documents, for manipulating them in memory by adding/deleting/changing
    attribute values and child nodes, and for extracting specific nodes from
    larger XML objects.  It is written entirely in PHP (as a file to
    "require"), and depends on no other software, tools, libraries etc.  

<P> To see dummy applications of xml2tree, aim browser at one of the php files
in this directory, served by a php4-enabled server; you can see the structure
of the XML in PHP memory in the browser window. Further explanations of the
functions involved are below.


<blockquote>
<p> Here are the sample demo files, viewable <i>only</i> on your own
    php4-server after you download and un-tar this package (i.e. not viewable
    via the Web); look at their .php
    source code in an editor to see how they work:
<p> <a href="readWrite.php">readWrite.php</a> (the server must have write
    permission in this directory!)
<p> <a href="fromScratch.php">fromScratch.php</a>
<p> <a href="extracting.php">extracting.php</a>
</blockquote>

<hr>
<b> General advice on using xml2tree </b>


<p> NOTE: the phrase "xml2tree" is approximate only!  Certain XML constructs
are NOT supported (external entities, sibling-pointers, processing
instructions).
xml2tree was written to expedite a particular application (storing and
manipulating a certain type of XML file); it does not conform
to the <a href="http://www.w3.org/TR/REC-DOM-Level-1/ "> Document Object Model
(DOM)</a>, which is the formal standard for XML memory representations.  This
project is meant only to be more useful  than nothing at all.

<P> NOTE: <b>Do not</b> try to print out a treeNode with print_r() or
var_dump(); you will get stuck in an infinite loop, because each node has a
reference to its parent, which prints the child, which prints the parent, etc
etc.  Use the class member functions treeNode->printEcho() or printHTML()
instead for debugging.

<P>
There is one file, xml2tree.inc, which should be included (or "require"-ed)
in any php file making use of these tools.  Here follows a description of
what is in that file.


<p>/************* "in-memory" functions *******************/

<P>The main structure is a class called treeNode, whose structure is
below. The whole purpose for xml2tree is is allow direct manipulation of an
XML "object", so the member functions and class members here are the things 
you will presumably want to use.

<pre>
 class treeNode{
    var $parent;  // a reference to the parent treeNode, if existing
    var $name;        // the tagname for this node
    var $attributes;  // an associative array of the attributes (maybe empty)
    var $children;    // an array of strings and treeNodes

    // constructor for a treeNode object

    function treeNode( $newName )



    // copy() does an infinitely deep copy, as does copy(-1); any non-negative
    // argument tells how deep the copy should be.  It returns the new 
    // treeNode (the argument $deep is optional).

    function copy($deep="-1")


    // insertChild[Node/Text/Copy] makes a new child.  The simplest is
    // insertChildText, which makes a child string; the next simplest is
    // insertChildNode, which puts a reference to a node into another node 
    // (it does NOT copy it); the last is insertChildCopy, which
    // makes a new copy of the argument node. 
    // The default for inserting a child is appending; any non-negative
    // integer passed in as $newPlace will put child as close to that 
    // location as possible (the final $newPlace argument is optional).

    function insertChildNode( &$newChild , $newPlace="-1")
    function insertChildText( $newChild , $newPlace="-1")
    function insertChildCopy( $newChild , $newPlace="-1")



    // kills the child at the location $killPlace (or at the nearest
    // location to it), and fills in the leftover hole.  $killPlace may
    // be an integer location, or a "template" node (as in extract() below)
    // which gives the name/attributes of any child to delete, w/o knowing
    // its exact location. 
    function deleteChild( $killPlace)


    // deletes ("unset") the attribute given by $attKey
    function deleteAttribute( $attKey )


    // prints out indented XML to the browser's Page Source
    function printEcho()

    // prints out indented HTML to the browser's display
    function printHTML()

    // prints out indented XML to a string (the final $indent argument
    // is optional).
    function printOut(&$xmlString,  $indent="")

    // like printOut() above, but only prints the text content of nodes
    // (recursively), without printing the tags or attributes and
    // without newlines or indentation.
    function printText(&$xmlString)


    // Takes a template node, and
    // extracts references to any node with the same name and 
    // attribute values as the template.  The results are put in the
    // two rows of $resultArray: $resultArray["nodes"] is a flat array
    // of the returned nodes (at whatever depths they were found), and
    //  $resultArray["depth"] is a flat array of the depths at which
    // those nodes were found.  (The final $depth argument is optional).

    function extract( &$resultArray, $template, $depth=0 )
      

    // extracts only those nodes at a specific depths, and returns
    // a flat array of those nodes, rather than a 2xN array 
    // i.e. this returns array[N] rather than
    // array ["nodes"][N] and array ["depth"][N] 
    function extractAtDepth( &$resultArray, $template, $targetDepth )

  }

/************ File functions *******************/

The function readXML( $xmlFile ) reads the file given by the string $xmlFile
and returns a treeNode with the contents.


The function writeXML($outFileName, $topOutNode) takes a string $outFileName
and a treeNode $topOutNode, and writes an xml file (indented, natch)
from the treeNode.

</pre>

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