Public Member Functions | Data Fields

ilSQL2XML Class Reference

Class for exporting XML documents stored in a relational database to a domxml representation. More...

Public Member Functions

 ilSQL2XML ($a_lm_id, $a_lo_id="")
 constructor init db-handler
 getLearningObject ()
 gets Learning Object an all its sub LOs builds with this information a domDocument and return the domxml representation of this xml document
 buildXML ()
 getStructure ($a_lo_id)
 getTree ($a_lo_id)
 gets specified element and all its subelements, builds with this information a domDocument and return the domxml representation of this xml document
 getNode ($a_node_id)
 gets specified element with all attributes and text elements return the domDocument
 getElementName ($a_node_id)
 gets specified element
 getElementText ($a_node_id)
 getAttributes ($a_node_id)
 get all attributes of specified element returns false if element has no attributes
 getAttributeValue ($a_lo_id, $a_element, $a_attribute)
 get a single attribute value of a given element and LearningObject
 setNavigation ()
 img_link ($a_img)
 img_url ($a_id, $a_parent, $a_img)
 getChildNodes ($a_node_id)
 get all childs of specified element and return them in an array of domNode objects in the orginal order (from left zu right) returns false if element has no childs
 getParentNode ($a_node_id)
 get parent of specified element and return domNode object returns false if element has no parent (its the root node)
 getFirstChild ($a_node_id)
 getprevSibling ($a_node_id)
 getNextSibling ($a_node_id)

Data Fields

 $domxml
 $obj_id
 $mapping
 $hash
 $ilias

Detailed Description

Class for exporting XML documents stored in a relational database to a domxml representation.

Author:
Sascha Hofmann <shofmann@databay.de>
Version:
Id:
class.ilSQL2XML.php 1301 2003-05-16 13:39:22Z smeyer

Definition at line 31 of file class.ilSQL2XML.php.

Member Function Documentation

ilSQL2XML::buildXML (  ) 

Definition at line 245 of file class.ilSQL2XML.php.

References $start.

Referenced by getLearningObject().

        {
        global $start;

                //$T4 = ilUtil::StopWatch();

                foreach ($this->lo_struct as $key => $node_data)
                {
                        // exclude root node
                        if ($key > $start["node_id"])
                        {
                                $insert = false;
                                switch ($node_data["node_type_id"])
                                {
                                        case 1:
                                                $node = $this->doc->create_element($node_data["element"]);
        
                                                // set attributes
                                                if (is_array($node_data["attr_list"]))
                                                {
                                                        foreach ($node_data["attr_list"] as $attr => $value)
                                                        {
                                                                $node->set_attribute($attr, $value);
                                                        }
                                                }
                                                
                                                $insert = true;
                                                break;

                                        case 3:
                                                $node = $this->doc->create_text_node($node_data["textnode"]);

                                                $insert = true;
                                                break;
                                                
                                }

                                if ($insert)
                                {
                                        //get parent node
                                        $parent = $this->hash[$node_data["parent_node_id"]];
                                
                                        //build node
                                        $node = $parent->append_child($node);
                                        $this->hash[$this->lo_struct[$key]["node_id"]] = $node;
                                }
                        }
                }

                //echo ilUtil::StopWatch($T4)." build_XML<br/>";
        }

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ilSQL2XML::getAttributes ( $  a_node_id  ) 

get all attributes of specified element returns false if element has no attributes

Parameters:
integer node_id of domNode
Returns:
array all attributes (attr[name] = value) public

Definition at line 523 of file class.ilSQL2XML.php.

References $data, $q, $res, and $row.

        {
                $q = "SELECT a_name.attribute,a_value.value ".
                         "FROM lo_attribute_idx AS a_idx ".
                         "LEFT JOIN lo_attribute_name AS a_name ON a_idx.attribute_id=a_name.attribute_id ".
                         "LEFT JOIN lo_attribute_value AS a_value ON a_idx.value_id=a_value.value_id ".
                         "WHERE a_idx.node_id = '".$a_node_id."'";
                         
                 //echo $q;exit;

                $res = $this->ilias->db->query($q);
                
                if ($res->numRows())
                {
                        while ($row = $res->fetchRow(DB_FETCHMODE_ASSOC))
                        {
                                $data[$row["attribute"]] = $row["value"];
                        }

                        return $data;
                }

                return false;
        }

ilSQL2XML::getAttributeValue ( $  a_lo_id,
$  a_element,
$  a_attribute 
)

get a single attribute value of a given element and LearningObject

Parameters:
integer lo_id
string element name
Returns:
string attribute value public

Definition at line 557 of file class.ilSQL2XML.php.

References $q, $res, and $row.

Referenced by getLearningObject(), and ilSQL2XML().

        {
                //$T3 = ilUtil::StopWatch();            

                $q = "SELECT a_value.value ".
                         "FROM lo_tree AS lo ".
                         "LEFT JOIN lo_element_idx AS e_idx ON lo.node_id = e_idx.node_id ".
                         "LEFT JOIN lo_element_name AS el ON e_idx.element_id = el.element_id ".
                         "LEFT JOIN lo_attribute_idx AS a_idx ON lo.node_id = a_idx.node_id ".
                         "LEFT JOIN lo_attribute_name AS a_name ON a_idx.attribute_id=a_name.attribute_id ".
                         "LEFT JOIN lo_attribute_value AS a_value ON a_idx.value_id=a_value.value_id ".
                         "WHERE lo_id = '".$a_lo_id."' ".
                         "AND lo.struct > 0 ". // <-- need a bitwise AND against 1
                         "AND el.element = '".$a_element."' ".
                         "AND a_name.attribute = '".$a_attribute."'";
                         
                //echo $q;exit;

                $res = $this->ilias->db->query($q);
                $row = $res->fetchRow();
                //echo ilUtil::StopWatch($T3)." getAttributeValue<br/>";
        
                return $row[0];
        }

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ilSQL2XML::getChildNodes ( $  a_node_id  ) 

get all childs of specified element and return them in an array of domNode objects in the orginal order (from left zu right) returns false if element has no childs

Parameters:
integer node_id of domNode
Returns:
array domNode objects which are childs of $a_node_id public

Definition at line 670 of file class.ilSQL2XML.php.

        {
                return $nodes;
        
                return false;
        }

ilSQL2XML::getElementName ( $  a_node_id  ) 

gets specified element

Parameters:
integer node_id of domNode
Returns:
object domNode public

Definition at line 496 of file class.ilSQL2XML.php.

References $q, and $res.

        {
                $q = "SELECT leaf_text FROM lo_element_name_leaf ".
                         "WHERE node_id='".$a_node_id."' LIMIT 1";
                //$res = $this->ilias->db->query($q);
                $res = $this->ilias->db->getRow($q, DB_FETCHMODE_ASSOC);

                return $res["leaf_text"];
        }

ilSQL2XML::getElementText ( $  a_node_id  ) 

Definition at line 506 of file class.ilSQL2XML.php.

References $q, and $res.

        {
                $q = "SELECT leaf_text FROM lo_text_leaf ".
                         "WHERE node_id='".$a_node_id."' LIMIT 1";
                //$res = $this->ilias->db->query($q);
                $res = $this->ilias->db->getRow($q, DB_FETCHMODE_ASSOC);

                return $res["leaf_text"];
        }

ilSQL2XML::getFirstChild ( $  a_node_id  ) 

Definition at line 693 of file class.ilSQL2XML.php.

        {
                return $node;
        
                return false;
        }

ilSQL2XML::getLearningObject (  ) 

gets Learning Object an all its sub LOs builds with this information a domDocument and return the domxml representation of this xml document

Parameters:
integer object_id where to start fetching the xml data
Returns:
object domDocument public

*

Definition at line 139 of file class.ilSQL2XML.php.

References $path, $start, buildXML(), domxml_open_mem(), getAttributeValue(), and getStructure().

        {
                global $start;

                $this->lo_struct = $this->getStructure($this->lo_id);
                
                // build path information for DTD location
                if (strstr(php_uname(), "Windows"))
                {
                        $path = "file://";
                }

                $path .= getcwd();
                
                // create the xml string (workaround for domxml_new_doc) ***
/*
                $xmlHeader = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>". // *** ISO-8859-1
                                         "<!DOCTYPE LearningObject SYSTEM \"".$path."/xml/ilias_lo.dtd\">";
                                         
                return $xmlHeader.$this->lo_struct;             
*/
                
                // create the xml string (workaround for domxml_new_doc) ***
                $xmlHeader = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>". // *** ISO-8859-1
                                         "<!DOCTYPE LearningObject SYSTEM \"".$path."/xml/ilias_lo.dtd\">".
                                         "<root />"; // dummy node
                
                // create a domxml document object
                $this->doc = domxml_open_mem($xmlHeader); // *** Fehlerabfrage
                
                // delete dummy node 
                $root = $this->doc->document_element();
                $root->unlink_node();

                // skip document node
                reset($this->lo_struct);
                $start = next($this->lo_struct);
                
                // create root node
                $node = $this->doc->create_element($start["element"]);

                $root = $this->doc->append_child($node);
                
                $this->hash[$start["node_id"]] = $root;
                
                // build XML document
                $this->buildXML();
                        
                // now get the Level-1-LOs
                if (count($subnodes = $this->doc->get_elements_by_tagname("LO")) > 0)
                {
                        foreach ($subnodes as $subnode)
                        {
                                // fetching lo_id and remove placeholder node
                                $attributes = $subnode->attributes();
                                $lo_id = $attributes[0]->value;

                                $level = $this->getAttributeValue($lo_id,"General","AggregationLevel");
                                // get next LO
                                //todo: first check if LO is of Level 1 !!!

                                //$T6 = ilUtil::StopWatch();

                                if ($level == "1")
                                {
                                        $this->hash = array();
                                        $this->lo_struct = $this->getStructure($lo_id);

                                        // skip document node
                                        reset($this->lo_struct);
                                        $start = next($this->lo_struct);

                                        // create first node (LearningObject)
                                        $node = $this->doc->create_element($start["element"]);

                                        $parent = $subnode->parent_node();
                                        $subnode->unlink_node();

                                        $root = $parent->append_child($node);

                                        $this->hash[$start["node_id"]] = $root;

                                        // build next XML
                                        $this->buildXML();

                                        //echo ilUtil::StopWatch($T6)." get_sub LO<br/>";
                                }
                                else
                                {
                                        //$obj_data = getObject($lo_id);
                                        $loObj =& $this->ilias->obj_factory->getInstanceByObjId($lo_id);
                                        $subnode->set_attribute("title", $loObj->getTitle());
                                        $subnode->set_attribute("level", $level);
                                        unset($loObj);
                                }

                                //if (($this->level == "3") and ($level == "2" or $level == "3"))

                        }
                }
//*/

                return $this->doc->dump_mem(true);
        }

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ilSQL2XML::getNextSibling ( $  a_node_id  ) 

Definition at line 707 of file class.ilSQL2XML.php.

        {
                return $node;
        
                return false;
        }

ilSQL2XML::getNode ( $  a_node_id  ) 

gets specified element with all attributes and text elements return the domDocument

Parameters:
integer node_id where to start fetching the xml data
Returns:
object domDocument public

Definition at line 484 of file class.ilSQL2XML.php.

        {
                return $node;
        }

ilSQL2XML::getParentNode ( $  a_node_id  ) 

get parent of specified element and return domNode object returns false if element has no parent (its the root node)

Parameters:
integer node_id of domNode
Returns:
array parent domNode object public

Definition at line 686 of file class.ilSQL2XML.php.

        {
                return $node;
        
                return false;
        }

ilSQL2XML::getprevSibling ( $  a_node_id  ) 

Definition at line 700 of file class.ilSQL2XML.php.

        {
                return $node;
        
                return false;
        }

ilSQL2XML::getStructure ( $  a_lo_id  ) 

*

Definition at line 298 of file class.ilSQL2XML.php.

References $data, $q, $res, and $row.

Referenced by getLearningObject().

        {
                //$T1 = ilUtil::StopWatch();
                
                /*
                $q = "SELECT lo.node_id, lo.node_type_id, lo.lo_id, lo.parent_node_id, lo.struct, tx.textnode, el.element ".
                         "FROM lo_tree AS lo ".
                         "LEFT OUTER JOIN lo_element_idx AS e_idx ON lo.node_id = e_idx.node_id ".
                         "LEFT OUTER JOIN lo_element_name AS el ON e_idx.element_id = el.element_id ".
                         "LEFT OUTER JOIN lo_text AS tx ON lo.node_id = tx.node_id ".
                         "WHERE lo_id='".$a_lo_id."' ".
                         "ORDER BY lft ASC";
                */
                
                // Variant: get ALL data including attributes. Very fast! Drawback are multiple rows for each nodes 
                $q = "SELECT lo.node_id, lo.node_type_id, lo.lo_id, lo.parent_node_id, lo.struct, tx.textnode, el.element, a_name.attribute, a_value.value ".
                         "FROM lo_tree AS lo ".
                         "LEFT OUTER JOIN lo_element_idx AS e_idx ON lo.node_id = e_idx.node_id ".
                         "LEFT OUTER JOIN lo_element_name AS el ON e_idx.element_id = el.element_id ".
                         "LEFT OUTER JOIN lo_text AS tx ON lo.node_id = tx.node_id ".
                         "LEFT OUTER JOIN lo_attribute_idx AS a_idx ON lo.node_id = a_idx.node_id ".
                         "LEFT JOIN lo_attribute_name AS a_name ON a_idx.attribute_id=a_name.attribute_id ".
                         "LEFT JOIN lo_attribute_value AS a_value ON a_idx.value_id=a_value.value_id ".
                         "WHERE lo_id='".$a_lo_id."' ".
                         "ORDER BY lft ASC";
                         
                         //echo $q;exit;
//*/
                
                // 2. variant: I think this is the fastest but you need mysql 4.x in order to use UNION statement
/*
                $q = "SELECT rgt FROM lo_tree ".
                         "WHERE lo_id = '".$a_lo_id."' ".
                         "AND lft = 1";
                
                $res = $this->ilias->db->query($q);
                
                while ($row = $res->fetchRow(DB_FETCHMODE_ASSOC))
                {
                        $rgt_max = $row["rgt"];
                }

                $q = "(SELECT n.lft AS seq_no_1, 4 AS seq_no_2, 0 AS seq_no_3, 0 AS seq_no_4, x.node_id AS seq_no_5, x.textnode AS parsed_text ".
                         "FROM lo_tree n, lo_text x ".
                         "WHERE n.lo_id = '".$a_lo_id."' ".
                         "AND n.lft >= 1 ".
                         "AND n.lft < '".$rgt_max."' ".
                         "AND n.node_id = x.node_id) ".
                         "UNION ".
                         "(SELECT n.lft, 1, 0, 0, 0, t.lft_delimiter ".
                         "FROM lo_tree n, lo_node_type t ".
                         "WHERE n.lo_id = '".$a_lo_id."' ".
                         "AND n.node_type_id = t.node_type_id ".
                         "AND n.lft >= 1 ".
                         "AND n.lft < '".$rgt_max."' ".
                         "AND t.lft_delimiter > '') ".
                         "UNION ".
                         "(SELECT n.lft, 2, 0, 0, 0, e.element ".
                         "FROM lo_element_name e, lo_element_idx e_idx, lo_tree n ".
                         "WHERE n.lo_id = '".$a_lo_id."' ".
                         "AND n.node_id = e_idx.node_id AND ".
                         "e.element_id = e_idx.element_id) ".
                         "UNION ".
                         "(SELECT n.lft, 3, a.attribute_id, 1, 0, CONCAT(' ', a.attribute, '=\"' ) ".
                         "FROM lo_attribute_name a, lo_attribute_idx a_idx, lo_tree n ".
                         "WHERE n.lo_id = '".$a_lo_id."' ".
                         "AND n.lft >= 1 ".
                         "AND n.lft < '".$rgt_max."' ".
                         "AND n.node_id = a_idx.node_id ".
                         "AND a.attribute_id = a_idx.attribute_id) ".
                         "UNION ".
                         "(SELECT n.lft, 3, a_idx.attribute_id, 2, n.node_id, CONCAT( a.value, '\"' ) ".
                         "FROM lo_attribute_value a, lo_attribute_idx a_idx, lo_tree n ".
                         "WHERE n.lo_id = '".$a_lo_id."' ".
                         "AND n.lft >= 1 ".
                         "AND n.lft < '".$rgt_max."' ".
                         "AND n.node_id = a_idx.node_id ".
                         "AND a.value_id = a_idx.value_id) ".
                         "UNION ".
                         "(SELECT n.lft, 9, 0, 0, 0, t.rgt_delimiter ".
                         "FROM lo_tree n, lo_node_type t ".
                         "WHERE n.lo_id = '".$a_lo_id."' ".
                         "AND n.node_type_id = t.node_type_id ".
                         "AND t.rgt_delimiter > '' ".
                         "AND n.lft >= 1 ".
                         "AND n.lft < '".$rgt_max."') ".
                         "UNION ".
                         "(SELECT n.rgt, 10, 0, 0, 0, CONCAT( t.lft_delimiter, '/' ) ".
                         "FROM lo_tree n, lo_node_type t ".
                         "WHERE n.lo_id = '".$a_lo_id."' ".
                         "AND n.node_type_id = t.node_type_id ".
                         "AND n.node_type_id = 1 ".
                         "AND t.lft_delimiter > '' ".
                         "AND n.lft >= 1 ".
                         "AND n.lft < '".$rgt_max."') ".
                         "UNION ".
                         "(SELECT n.rgt, 10, 0, 3, 0, e.element ".
                         "FROM lo_element_name e, lo_element_idx e_idx, lo_tree n ".
                         "WHERE n.lo_id = '".$a_lo_id."' ".
                         "AND n.node_id = e_idx.node_id ".
                         "AND e.element_id = e_idx.element_id) ".
                         "UNION ".
                         "(SELECT n.rgt, 10, 0, 4, 0, t.rgt_delimiter FROM lo_tree n, lo_node_type t ".
                         "WHERE n.lo_id = '".$a_lo_id."' ".
                         "AND n.node_type_id = t.node_type_id ".
                         "AND t.rgt_delimiter > '' ".
                         "AND n.lft >= 1 ".
                         "AND n.lft < '".$rgt_max."') ".
                         "ORDER BY seq_no_1, seq_no_2, seq_no_3, seq_no_4, seq_no_5";
                
                
                //echo $q;exit;

                $res = $this->ilias->db->query($q);
                
                if ($res->numRows() == 0)
                {
                        $this->ilias->raiseError("no LearningObject ID given",$this->ilias->error_obj->FATAL);
                }

                while ($row = $res->fetchRow(DB_FETCHMODE_ASSOC))
                {
                        $data[] = $row["parsed_text"];
                }
                
                echo ilUtil::StopWatch($T1)." get_structure<br/>";
                
                return implode($data);
*/

                $res = $this->ilias->db->query($q);
                
                while ($row = $res->fetchRow(DB_FETCHMODE_ASSOC))
                {
                        $data[$row["node_id"]] = $row;

                        if ($row["struct"] & 1)
                        {
                                $tmp[$row["node_id"]][] = array ($row["attribute"] => $row["value"]);
                        }
                }


                foreach ($tmp as $node_id => $node)
                {
                        $attr_list = array();
                        
                        foreach ($node as $attr)
                        {
                                //var_dump($attr);
                                $attr_list[key($attr)] = $attr[key($attr)];
                        }

                        $data[$node_id]["attr_list"] = $attr_list;
                }

                // remove document node
                //array_shift($data);
                
                //echo ilUtil::StopWatch($T1)." get_structure<br/>";
                return $data;
        }

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ilSQL2XML::getTree ( $  a_lo_id  ) 

gets specified element and all its subelements, builds with this information a domDocument and return the domxml representation of this xml document

Parameters:
integer object_id where to start fetching the xml data
Returns:
object domDocument public

Definition at line 471 of file class.ilSQL2XML.php.

References $tree.

        {
                return $tree;
        }

ilSQL2XML::ilSQL2XML ( $  a_lm_id,
$  a_lo_id = "" 
)

constructor init db-handler

public

Definition at line 79 of file class.ilSQL2XML.php.

References $ilias, and getAttributeValue().

        {
                global $ilias;
                
                $this->ilias =& $ilias;
                $this->lm_tree = new ilTree ($a_lm_id,$a_lm_id);

                if (!$a_lm_id)
                {
                        $this->ilias->raiseError("No LearningModule ID given",$this->ilias->error_obj->FATAL);
                }
        
                $this->lm_id = $a_lm_id;
                
                if (!$a_lo_id)
                {
                        // get chapter overview or get first LO in tree?
                        // get first LO:
                        $node_data = $this->lm_tree->getChilds($this->lm_id);
                        
                        if (!$node_data[0]["obj_id"])
                        {
                                $this->ilias->raiseError("No LearningObjects found",$this->ilias->error_obj->FATAL);
                        }

                        $this->lo_id = $node_data[0]["obj_id"];
                        
                }
                else
                {
                        $this->lo_id = $a_lo_id;
                }
                
                //get parent lo_id
                $this->lo_parent = $this->lm_tree->getParentId($this->lo_id);
                
                /*
                if (empty($_GET["lo_parent"]))
                {
                        $this->lo_parent = $this->lm_id;
                }
                else
                {
                        $this->lo_parent = $_GET["lo_parent"];
                }
                */
                
                // get level
                $this->level = $this->getAttributeValue($this->lo_id,"General","AggregationLevel");
        }

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ilSQL2XML::img_link ( $  a_img  ) 

Definition at line 651 of file class.ilSQL2XML.php.

Referenced by setNavigation().

        {
                return "<img src=\"./images/navigation/".$a_img."\" border=\"0\"/>";
        }

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ilSQL2XML::img_url ( $  a_id,
$  a_parent,
$  a_img 
)

Definition at line 656 of file class.ilSQL2XML.php.

References $_GET.

        {
                return "<a href=\"./lo_view.php?type=lo&obj_id=".$_GET["obj_id"]."&lm_id=".$_GET["lm_id"]."&lo_id=".$a_id."&lo_parent=".$a_parent."\">".$a_img."</a>";
        }

ilSQL2XML::setNavigation (  ) 

Definition at line 582 of file class.ilSQL2XML.php.

References $navbar, and img_link().

        {
                // chapter up
        
                // todo: i need the parent parent at this place!
                if ($this->lo_parent != $this->lm_id)
                {
                        $up["child"] = $this->lo_parent;
                        $up["parent"] = "missing";
                }
                
                // previous & next page
                $node_data = $this->lm_tree->getChilds($this->lo_parent);
                
                foreach ($node_data as $key => $node)
                {
                        if ($this->lo_id == $node["child"])
                        {
                                if ($key > 0)
                                {
                                        $prev["child"] = $node_data[$key-1]["child"];
                                        $prev["parent"] = $node_data[$key-1]["parent"];
                                }
                                
                                if (count($node_data) > $key + 1)
                                {
                                        $next["child"] = $node_data[$key+1]["child"];
                                        $next["parent"] = $node_data[$key+1]["parent"];
                                }
                                else
                                {
                                        // look if there is a subchapter
                                        $subnode_data = $this->lm_tree->getChilds($this->lo_id);
                                        
                                        if (count($subnode_data) > 0)
                                        {
                                                // fetch first child
                                                $next["child"] = $subnode_data[0]["child"];
                                                $next["parent"] = $subnode_data[0]["parent"];
                                        }
                                }
                                
                                break;
                        }
                }
                
                
                $navbar = "<table border=\"0\" cellspacing=\"0\" cellpadding=\"0\"><tr>";
                
                if ($prev)
                {
                        $navbar .= "<td>".$this->img_url($prev["child"],$prev["parent"],$this->img_link("arr_left.gif"))."</td>";
                }
                
                if ($up)
                {
                        $navbar .= "<td>".$this->img_url($up["child"],$up["parent"],$this->img_link("arr_up.gif"))."</td>";
                }
                
                if ($next)
                {
                        $navbar .= "<td>".$this->img_url($next["child"],$next["parent"],$this->img_link("arr_right.gif"))."</td>";
                }
                
                $navbar .= "</tr></table>";
                
                return $navbar;
        }

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Field Documentation

ilSQL2XML::$domxml

Definition at line 39 of file class.ilSQL2XML.php.

ilSQL2XML::$hash

Definition at line 63 of file class.ilSQL2XML.php.

ilSQL2XML::$ilias

Definition at line 71 of file class.ilSQL2XML.php.

Referenced by ilSQL2XML().

ilSQL2XML::$mapping

Definition at line 55 of file class.ilSQL2XML.php.

ilSQL2XML::$obj_id

Definition at line 47 of file class.ilSQL2XML.php.

The documentation for this class was generated from the following file:
Generated on Fri Dec 13 2013 10:18:53 for ILIAS Release_3_5_x_branch .rev 46805 by  doxygen 1.7.1