diff --git a/library/HTMLPurifier/DefinitionBuilder.php b/library/HTMLPurifier/DefinitionBuilder.php
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+++ b/library/HTMLPurifier/DefinitionBuilder.php
@@ -0,0 +1,286 @@
+<?php
+
+require_once 'HTMLPurifier/AttrDef.php';
+    require_once 'HTMLPurifier/AttrDef/Enum.php';
+    require_once 'HTMLPurifier/AttrDef/ID.php';
+require_once 'HTMLPurifier/ChildDef.php';
+require_once 'HTMLPurifier/Generator.php';
+require_once 'HTMLPurifier/Token.php';
+require_once 'HTMLPurifier/TagTransform.php';
+
+/**
+ * Defines the purified HTML type with large amounts of objects.
+ * 
+ * The main function of this object is its $info array, which is an 
+ * associative array of all the child and attribute definitions for
+ * each allowed element. It also contains special use information (always
+ * prefixed by info) for intelligent tag closing and global attributes.
+ * 
+ * Planned improvements include attribute transformation objects as well as
+ * migration of auto-tag-closing from HTMLPurifier_Strategy_MakeWellFormed
+ * (these can likely just be extensions of ElementDef).
+ * 
+ * After development drops off, the definition generation will be moved to
+ * a maintenance script and we will stipulate that definition be created
+ * by a factory method that unserializes a serialized version of Definition.
+ * Customization would entail copying the maintenance script, making the
+ * necessary changes, generating the serialized object, and then hooking it
+ * in via the factory method. We would also offer a LiveDefinition for
+ * automatic recompilation, suggesting that we would have a DefinitionGenerator.
+ */
+
+class HTMLPurifier_Definition
+{
+    
+    var $info = array();
+    
+    // used solely by HTMLPurifier_Strategy_ValidateAttributes
+    var $info_global_attr = array();
+    
+    // used solely by HTMLPurifier_Strategy_FixNesting
+    var $info_parent = 'div';
+    
+    // used solely by HTMLPurifier_Strategy_RemoveForeignElements
+    var $info_tag_transform = array();
+    
+    function instance() {
+        static $instance = null;
+        if (!$instance) {
+            $instance = new HTMLPurifier_Definition();
+            $instance->setup();
+        }
+        return $instance;
+    }
+    
+    function HTMLPurifier_Definition() {}
+    
+    function setup() {
+        
+        // emulates the structure of the DTD
+        // these are condensed, however, with bad stuff taken out
+        // screening process was done by hand
+        
+        //////////////////////////////////////////////////////////////////////
+        // info[] : initializes the definition objects
+        
+        // if you attempt to define rules later on for a tag not in this array
+        // PHP will create an stdclass
+        
+        $allowed_tags =
+            array(
+                'ins', 'del', 'blockquote', 'dd', 'li', 'div', 'em', 'strong',
+                'dfn', 'code', 'samp', 'kbd', 'var', 'cite', 'abbr', 'acronym',
+                'q', 'sub', 'tt', 'sup', 'i', 'b', 'big', 'small', 'u', 's',
+                'strike', 'bdo', 'span', 'dt', 'p', 'h1', 'h2', 'h3', 'h4',
+                'h5', 'h6', 'ol', 'ul', 'dl', 'address', 'img', 'br', 'hr',
+                'pre', 'a', 'table', 'caption', 'thead', 'tfoot', 'tbody',
+                'colgroup', 'col', 'td', 'th', 'tr'
+            );
+        
+        foreach ($allowed_tags as $tag) {
+            $this->info[$tag] = new HTMLPurifier_ElementDef();
+        }
+        
+        //////////////////////////////////////////////////////////////////////
+        // info[]->child : defines allowed children for elements
+        
+        // entities: prefixed with e_ and _ replaces .
+        
+        // we don't use an array because that complicates interpolation
+        // strings are used instead of arrays because if you use arrays,
+        // you have to do some hideous manipulation with array_merge()
+        
+        $e_special_extra = 'img';
+        $e_special_basic = 'br | span | bdo';
+        $e_special = "$e_special_basic | $e_special_extra";
+        $e_fontstyle_extra = 'big | small';
+        $e_fontstyle_basic = 'tt | i | b | u | s | strike';
+        $e_fontstyle = "$e_fontstyle_basic | $e_fontstyle_extra";
+        $e_phrase_extra = 'sub | sup';
+        $e_phrase_basic = 'em | strong | dfn | code | q | samp | kbd | var'.
+          ' | cite | abbr | acronym';
+        $e_phrase = "$e_phrase_basic | $e_phrase_extra";
+        $e_inline_forms = ''; // humor the dtd
+        $e_misc_inline = 'ins | del';
+        $e_misc = "$e_misc_inline";
+        $e_inline = "a | $e_special | $e_fontstyle | $e_phrase".
+          " | $e_inline_forms";
+        $e__inline = "#PCDATA | $e_inline | $e_misc_inline";
+        // note the casing
+        $e_Inline = new HTMLPurifier_ChildDef_Optional($e__inline);
+        $e_heading = 'h1|h2|h3|h4|h5|h6';
+        $e_lists = 'ul | ol | dl';
+        $e_blocktext = 'pre | hr | blockquote | address';
+        $e_block = "p | $e_heading | div | $e_lists | $e_blocktext | table";
+        $e__flow = "#PCDATA | $e_block | $e_inline | $e_misc";
+        $e_Flow = new HTMLPurifier_ChildDef_Optional($e__flow);
+        $e_a_content = new HTMLPurifier_ChildDef_Optional("#PCDATA | $e_special".
+          " | $e_fontstyle | $e_phrase | $e_inline_forms | $e_misc_inline");
+        $e_pre_content = new HTMLPurifier_ChildDef_Optional("#PCDATA | a".
+          " | $e_special_basic | $e_fontstyle_basic | $e_phrase_basic".
+          " | $e_inline_forms | $e_misc_inline");
+        $e_form_content = new HTMLPurifier_ChildDef_Optional(''); //unused
+        $e_form_button_content = new HTMLPurifier_ChildDef_Optional(''); // unused
+        
+        $this->info['ins']->child =
+        $this->info['del']->child = new HTMLPurifier_ChildDef_Chameleon($e__inline, $e__flow);
+        
+        $this->info['blockquote']->child=
+        $this->info['dd']->child  =
+        $this->info['li']->child  =
+        $this->info['div']->child = $e_Flow;
+        
+        $this->info['em']->child   =
+        $this->info['strong']->child    =
+        $this->info['dfn']->child  =
+        $this->info['code']->child =
+        $this->info['samp']->child =
+        $this->info['kbd']->child  =
+        $this->info['var']->child  =
+        $this->info['cite']->child =
+        $this->info['abbr']->child =
+        $this->info['acronym']->child   =
+        $this->info['q']->child    =
+        $this->info['sub']->child  =
+        $this->info['tt']->child   =
+        $this->info['sup']->child  =
+        $this->info['i']->child    =
+        $this->info['b']->child    =
+        $this->info['big']->child  =
+        $this->info['small']->child=
+        $this->info['u']->child    =
+        $this->info['s']->child    =
+        $this->info['strike']->child    =
+        $this->info['bdo']->child  =
+        $this->info['span']->child =
+        $this->info['dt']->child   =
+        $this->info['p']->child    = 
+        $this->info['h1']->child   = 
+        $this->info['h2']->child   = 
+        $this->info['h3']->child   = 
+        $this->info['h4']->child   = 
+        $this->info['h5']->child   = 
+        $this->info['h6']->child   = $e_Inline;
+        
+        // the only three required definitions, besides custom table code
+        $this->info['ol']->child   =
+        $this->info['ul']->child   = new HTMLPurifier_ChildDef_Required('li');
+        
+        $this->info['dl']->child   = new HTMLPurifier_ChildDef_Required('dt|dd');
+        
+        $this->info['address']->child =
+          new HTMLPurifier_ChildDef_Optional("#PCDATA | p | $e_inline".
+              " | $e_misc_inline");
+        
+        $this->info['img']->child  =
+        $this->info['br']->child   =
+        $this->info['hr']->child   = new HTMLPurifier_ChildDef_Empty();
+        
+        $this->info['pre']->child  = $e_pre_content;
+        
+        $this->info['a']->child    = $e_a_content;
+        
+        $this->info['table']->child = new HTMLPurifier_ChildDef_Custom(
+            '(caption?, (col*|colgroup*), thead?, tfoot?, (tbody+|tr+))');
+        
+        // not a real entity, watch the double underscore
+        $e__row = new HTMLPurifier_ChildDef_Required('tr');
+        $this->info['thead']->child = $e__row;
+        $this->info['tfoot']->child = $e__row;
+        $this->info['tbody']->child = $e__row;
+        $this->info['colgroup']->child = new HTMLPurifier_ChildDef_Optional('col');
+        $this->info['col']->child = new HTMLPurifier_ChildDef_Empty();
+        $this->info['tr']->child = new HTMLPurifier_ChildDef_Required('th | td');
+        $this->info['th']->child = $e_Flow;
+        $this->info['td']->child = $e_Flow;
+        
+        //////////////////////////////////////////////////////////////////////
+        // info[]->type : defines the type of the element (block or inline)
+        
+        // reuses $e_Inline and $e_block
+        
+        foreach ($e_Inline->elements as $name) {
+            $this->info[$name]->type = 'inline';
+        }
+        
+        $e_Block = new HTMLPurifier_ChildDef_Optional($e_block);
+        foreach ($e_Block->elements as $name) {
+            $this->info[$name]->type = 'block';
+        }
+        
+        //////////////////////////////////////////////////////////////////////
+        // info[]->excludes : defines elements that aren't allowed in here
+        
+        // make sure you test using isset() and not !empty()
+        
+        $this->info['a']->excludes = array('a' => true);
+        $this->info['pre']->excludes = array_flip(array('img', 'big', 'small',
+            // technically in spec, but we don't allow em anyway
+            'object', 'applet', 'font', 'basefont'));
+        
+        //////////////////////////////////////////////////////////////////////
+        // info[]->attr : defines allowed attributes for elements
+        
+        // this doesn't include REQUIRED declarations, those are handled
+        // by the transform classes. It will, however, do simple and slightly
+        // complex attribute value substitution
+        
+        // attrs, included in almost every single one except for a few,
+        // which manually override these in their local definitions
+        $this->info_global_attr = array(
+            // core attrs
+            'id' => new HTMLPurifier_AttrDef_ID(),
+            // i18n
+            'dir' => new HTMLPurifier_AttrDef_Enum(array('ltr','rtl'), false),
+            );
+        
+        //////////////////////////////////////////////////////////////////////
+        // UNIMP : info_tag_transform : transformations of tags
+        
+        $this->info_tag_transform['font']   = new HTMLPurifier_TagTransform_Font();
+        $this->info_tag_transform['menu']   = new HTMLPurifier_TagTransform_Simple('ul');
+        $this->info_tag_transform['dir']    = new HTMLPurifier_TagTransform_Simple('ul');
+        $this->info_tag_transform['center'] = new HTMLPurifier_TagTransform_Center();
+        
+        //////////////////////////////////////////////////////////////////////
+        // info[]->auto_close : tags that automatically close another
+        
+        // make sure you test using isset() not !empty()
+        
+        // these are all block elements: blocks aren't allowed in P
+        $this->info['p']->auto_close = array_flip(array(
+                'address', 'blockquote', 'dd', 'dir', 'div', 'dl', 'dt',
+                'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'hr', 'ol', 'p', 'pre',
+                'table', 'ul'
+            ));
+        
+        $this->info['li']->auto_close = array('li' => true);
+        
+        // we need TABLE and heading mismatch code
+        // we may need to make this more flexible for heading mismatch,
+        // or we can just create another info
+        
+        //////////////////////////////////////////////////////////////////////
+        // UNIMP : info[]->attr_transform : attribute transformations in elements
+        
+        //////////////////////////////////////////////////////////////////////
+        // UNIMP : info_attr_transform : global attribute transform (for xml:lang)
+        
+        // this might have bad implications for performance
+        
+    }
+    
+}
+
+class HTMLPurifier_ElementDef
+{
+    
+    var $attr = array();
+    var $auto_close = array();
+    var $child;
+    var $type = 'unknown';
+    var $excludes = array();
+    
+}
+
+?>
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