php-doc-en/reference/sdo_das_xml/reference.xml

<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.24 $ -->
<!-- Purpose: xml -->
<!-- Membership: pecl -->

<reference xml:id="ref.sdo-das-xml" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
 <title>SDO XML Data Access Service Functions</title>
 <titleabbrev>SDO DAS XML</titleabbrev>

 <partintro>
  <section xml:id="sdo-das-xml.intro">
   &reftitle.intro;
   <para>
    In order to use the XML Data Access Service for Service Data Objects,
    you will need to understand some of the concepts behind SDO:
    the data graph, the data object, XPath and property expressions,
    and so on.
    If you are not familiar with these ideas, you might want to look first at
    <link linkend='ref.sdo'>the section on SDO</link>.
   </para>
   <para>
    The job of the XML DAS is to move data between the
    application and an XML data source, which can be either a file or
    a URL. SDOs are always created and maintained according to a model 
    which defines type names and what property names each type may have.
    For data which is from XML, this SDO model is built from a schema file 
    written in XML schema language (an xsd file). This schema file is 
    usually passed to the create method when the XMLDAS is initialised. 
    The 
    <link xlink:href='&url.ibm.sdo;'>SDO 2.0 specification</link>
    defines the mapping between XML types and SDO types.
    There are a number of small limitations in the PHP support -
    not everything which is in the specification can be done - and
    these limitations are summarised in a later section.
   </para>
  </section>

  <section xml:id="sdo-das-xml.requirements">
   &reftitle.required;
   <para>
    The SDO XML Data Access Service requires PHP 5.1.0 or higher.
    It is packaged with the SDO extension and requires
    SDO to have been installed.
    See the
    <link linkend="sdo.installation">SDO installation instructions</link>
    for the details of how to do this.
   </para>
  </section>

  <section xml:id="sdo-das-xml.installation">
   &reftitle.install;
   <para>
    The XML Data Access Service is packaged and installed as part of the
    <link linkend='ref.sdo'>SDO extension</link>. Please Refer 
    <link linkend="sdo.installation">SDO installation instructions</link>.
   </para>
  </section>
 
  <section xml:id='sdo-das-xml.examples'>
   &reftitle.examples;
   <para>
    Several of the following examples are based on the
    <link linkend="sdo.sample.sequence">letter example</link>
    described in the
    <link linkend="ref.sdo">SDO documentation</link>.
    The examples assume the XML Schema for the letter is contained in a file
    <filename>letter.xsd</filename>
    and the letter instance is in the file
    <filename>letter.xml</filename>.
    These two files are reproduced here:
   </para>
   <para>
    <programlisting role="xml">
<![CDATA[
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
  xmlns:letter="http://letterSchema"
  targetNamespace="http://letterSchema">
  <xsd:element name="letters" type="letter:FormLetter"/>
  <xsd:complexType name="FormLetter" mixed="true">
    <xsd:sequence>
      <xsd:element name="date" minOccurs="0" type="xsd:string"/>
      <xsd:element name="firstName" minOccurs="0" type="xsd:string"/>
      <xsd:element name="lastName" minOccurs="0" type="xsd:string"/>
    </xsd:sequence>
  </xsd:complexType>
</xsd:schema>
]]>
    </programlisting>
   </para>
 
   <para>
    <programlisting role="xml">
<![CDATA[
<letter:letters xmlns:letter="http://letterSchema">
  <date>March 1, 2005</date>
  Mutual of Omaha
  Wild Kingdom, USA
  Dear
  <firstName>Casy</firstName>
  <lastName>Crocodile</lastName>
  Please buy more shark repellent.
  Your premium is past due.
</letter:letters>
]]>
    </programlisting>
   </para>
    
   <example>
    <title>Loading, altering, and saving an XML document</title>
    
    <para>
     The following example shows how an XML document can be loaded from a file,
     altered, and written back. 
    </para>

    <programlisting role="php" xml:id="sdo-das-xml.examples.loadfromfile">
     <![CDATA[
<?php
/**
 * Load, update, and save an XML document
 */
try {
   $xmldas = SDO_DAS_XML::create("letter.xsd");
   $document = $xmldas->loadFile("letter.xml");
   $root_data_object = $document->getRootDataObject();
   $root_data_object->date = "September 03, 2004";
   $root_data_object->firstName = "Anantoju";
   $root_data_object->lastName = "Madhu";
   $xmldas->saveFile($document, "letter-out.xml");
   echo "New file has been written:\n";
   print file_get_contents("letter-out.xml");
} catch (SDO_Exception $e) {
   print($e->getMessage());
}
?> ]]>
    </programlisting>

    <para>
     An instance of the XML DAS is first obtained from the 
     <function>SDO_DAS_XML::create</function>
     method, 
     which is a static method of the 
     <classname>SDO_DAS_XML</classname>
     class.
     The location of the xsd is passed as a parameter. 
     Once we have an instance of the XML DAS initialised
     with a given schema,
     we can use it to load the instance document using the 
     <function>loadFile</function>
     method.
     There is also a 
     <function>loadString</function>
     method if you want to load an XML 
     instance document from a string.
     If the instance document loads successfully, 
     you will be returned an object of type 
     <classname>SDO_DAS_XML_Document</classname>,
     on which you can call the 
     <function>getRootDataObject</function>
     method to get the SDO data object which is the root
     of the SDO data graph. 
     You can then use SDO operations to change the graph. 
     In this example we alter the 
     <varname>date</varname>, 
     <varname>firstName</varname>, and
     <varname>lastName</varname> properties.
     Then we use the 
     <function>saveFile</function>
     method to write the changed document back to the file system.
     The saveFile method has an optional extra integer argument which if specified
     will cause the XML DAS to format the XML, using the integer as the amount to 
     indent by at each change in level on the document. 
    </para>

    <para>
     This will write the following to <filename>letter-out.xml</filename>.
    </para>

    <programlisting role="xml" xml:id="sdo-das-xml.examples.loadfromfile.output">
     <![CDATA[
<?xml version="1.0" encoding="UTF-8"?>
<FormLetter xmlns="http://letterSchema" xsi:type="FormLetter" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <date>September 03, 2004</date>
  Mutual of Omaha
  Wild Kingdom, USA
  Dear
  <firstName>Anantoju</firstName>
  <lastName>Madhu</lastName>
  Please buy more shark repellent.
  Your premium is past due.
</FormLetter>     
]]>
   </programlisting>
    
   </example>

   <example>

    <title>Creating a new XML document</title>

    <para>
     The previous example loaded the document from a file. 
     This example shows how to create an SDO data graph in memory.
     In this example it is then saved to an XML string.
     Furthermore, because the letter contains both structured and 
     unstructured content, it uses
     <link linkend="sdo.sample.sequence">the Sequence API</link>
     as well assignments to properties to construct the data graph.
    </para>

    <programlisting role="php" xml:id="sdo-das-xml.examples.create">
     <![CDATA[
<?php
/**
 * Create an XML document from scratch
 */
try {
   $xmldas = SDO_DAS_XML::create("letter.xsd");
   try {
       $doc = $xmldas->createDocument();
       $rdo = $doc->getRootDataObject();
       $seq = $rdo->getSequence();
       $seq->insert("April 09, 2005", NULL, 'date');
       $seq->insert("Acme Inc. ", NULL, NULL);
       $seq->insert("United Kingdom. ");
       $seq->insert("Dear", NULL, NULL);
       $seq->insert("Tarun", NULL, "firstName");
       $seq->insert("Nayaraaa", NULL, "lastName");
       $rdo->lastName = "Nayar";
       $seq->insert("Please note that your order number ");
       $seq->insert(12345);
       $seq->insert(" has been dispatched today. Thanks for your business with us.");
       print($xmldas->saveString($doc));
   } catch (SDO_Exception $e) {
       print($e);
   }
} catch (SDO_Exception $e) {
   print("Problem creating an XML document: " . $e->getMessage());
}
?>
     ]]>
    </programlisting>

   </example>

   <para>
    The 
    <function>createDocument</function>
    method on the XML DAS returns a document object 
    with a single root data object corresponding to an empty document element. 
    The element name of the document element is known from the schema file. 
    If there is any ambiguity about what the document element is, as there can be 
    when more than one schema has been loaded into the same XML DAS, 
    the element name and the namespace URI can be passed to the 
    <function>createDocument</function> 
    method.
   </para>

   <para>
    This will emit the following output (line breaks have been inserted for readability):
   </para>

   <programlisting role="xml" xml:id="sdo-das-xml.examples.create.output">
     <![CDATA[
<?xml version="1.0" encoding="UTF-8"?>
<FormLetter xmlns="http://letterSchema" xsi:type="FormLetter" 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<date>April 09, 2005</date>
Acme Inc. United Kingdom. 
Dear
<firstName>Tarun</firstName>
<lastName>Nayar</lastName>
Please note that your order number 12345 has been 
dispatched today. Thanks for your business with us.
</FormLetter>
]]>
   </programlisting>


   <example>

    <title>Setting XML document properties</title>

    <para>
     This third example shows you how to set the XML version and
     encoding on the document object. 
     These will be used when the XML is written out.
     If no XML declaration is wanted at all
     (perhaps you want to generate the XML as a string to embed
     in something) then you can use the 
     <function>setXMLDeclaration</function>
     method to suppress it. 
    </para>

    <programlisting role="php" xml:id="sdo-das-xml.examples.Example3">
     <![CDATA[
<?php
/**
 * Illustrate the calls that control the XML declaration
 */
   $xmldas = SDO_DAS_XML::create("letter.xsd");
   $document = $xmldas->loadFile("letter.xml");
   $document->setXMLVersion("1.1");
   $document->setEncoding("ISO-8859-1");
   print($xmldas->saveString($document));
?> ]]>
    </programlisting>

    <para>
     The XML version and encoding are set in the XML declaration at the top 
     of the XML document.
    </para>

    <programlisting role="xml" xml:id="sdo-das-xml.examples.sdo_das_xml_document.output">
<![CDATA[
<?xml version="1.1" encoding="ISO-8859-1"?>
.../...
]]>
   </programlisting>
    
   </example>
   
   
   <example>
    <title>Using an open type</title>
    <para>
     This fourth example illustrates the use of an SDO open type 
     and the use of the 
     <function>createDataObject</function>
     method.
     For this example we use the following two 
     schema:
   </para>
   <para>
    <programlisting role="xml">
<![CDATA[
<schema  
  xmlns="http://www.w3.org/2001/XMLSchema">
  
  <element name="jungle">
    <complexType>
      <sequence>
        <any minOccurs="0" maxOccurs="unbounded"/>
      </sequence>
    </complexType>
  </element>
  
</schema>
]]>
    </programlisting>
   </para>

   <para>
     Note the presence of the 
     <varname>any</varname> 
     element in the definition.
     This first schema defines the 
     <varname>jungle</varname> 
     complex type as containing a sequence of 
     any other type. 
     The other types that the example will use are defined in a 
     second schema file:
    </para>
     
   <para>
    <programlisting role="xml">
<![CDATA[
<schema xmlns= "http://www.w3.org/2001/XMLSchema">

   <complexType name="snakeType">
     <sequence>
       <element name= "name" type="string"/>
       <element name= "length" type="positiveInteger" />
     </sequence>
   </complexType>

   <complexType name="bearType">
     <sequence>
       <element name= "name" type="string"/>
       <element name= "weight" type="positiveInteger" />
     </sequence>
   </complexType>

   <complexType name="pantherType">
     <sequence>
       <element name= "name" type="string"/>
       <element name= "colour" type="string" />
     </sequence>
   </complexType>

</schema>
]]>
    </programlisting>
   </para>
     
   <para>
    Here is the example PHP code that uses these two schema files:
   </para>
   
   <para>
    <programlisting role="php" xml:id="sdo-das-xml.examples.Example4">
     <![CDATA[
<?php

/**
 * Illustrate open types and the use of the addTypes() method
 */

$xmldas = SDO_DAS_XML::create();
$xmldas->addTypes("jungle.xsd"); // this is an open type i.e. the xsd specifies it can contain "any" type
$xmldas->addTypes('animalTypes.xsd');

$baloo            = $xmldas->createDataObject('','bearType');
$baloo->name      = "Baloo";
$baloo->weight    = 800;

$bagheera         = $xmldas->createDataObject('','pantherType');
$bagheera->name   = "Bagheera";
$bagheera->colour = 'inky black';

$kaa              = $xmldas->createDataObject('','snakeType');
$kaa->name        = "Kaa";
$kaa->length      = 25;

$document         = $xmldas->createDocument();
$do               = $document->getRootDataObject();
$do->bear         = $baloo;
$do->panther      = $bagheera;
$do->snake        = $kaa;

print($xmldas->saveString($document,2));

?>
 ]]>
    </programlisting>
   </para>
   <para>
    These two schema files are loaded into the XML DAS with first the 
    <function>create</function> 
    and 
    <function>addTypes</function>
     methods. 
    The 
    <function>createDataObject</function> 
    method is used to create three separate data objects. 
    In each case the namespaceURI and typename of the type are passed to the 
    <function>createDataObject</function> 
    method: in this example the namespace URI is blank because no
    namespace is used in the schema. 
    Once the three data objects - representing a bear, a panther and a snake - 
    have been created, a document object is created with the 
    <function>createDocument</function> 
    method. 
    In this case there is no ambiguity about what the document element of the
    document should be - as the second schema file only defines complex types, 
    the document element can only be the global 
    <varname>jungle</varname> 
    element defined 
    in the first schema. 
    This document will have a single root data object corresponding to an 
    empty document element <varname>jungle</varname>. 
    As this is an open type, properties can be added at will. 
    When the first assignment is made to <varname>$do->bear</varname>,
    a property 
    <varname>bear</varname> 
    is added to the root data object: 
    likewise for the next two assignments.
    When the document is written out by the 
    <function>saveString</function> 
    method, the resulting document is:
   </para>
   
   <para>
    <programlisting role="xml">
<![CDATA[
<?xml version="1.0" encoding="UTF-8"?>
<jungle xsi:type="jungle" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <bear xsi:type="bearType">
    <name>Baloo</name>
    <weight>800</weight>
  </bear>
  <panther xsi:type="pantherType">
    <name>Bagheera</name>
    <colour>inky black</colour>
  </panther>
  <snake xsi:type="snakeType">
    <name>Kaa</name>
    <length>25</length>
  </snake>
</jungle>
]]>
    </programlisting>
   </para>
       
   </example>

   <example>

    <title>Finding out what you can from the document</title>

    <para>
     This example is intended to illustrate how you can find the 
     element name and 
     namespace of the document element from the XML Document object, and 
     the SDO type and namespace from the root data object of the XML data 
     object, and how they relate to one another.
     This can be difficult to understand because there are four method calls:
     two can be made against the Document object, and two that can be made 
     against any data object including the root data object.
     Because of the rules that define how the SDO model is derived
     from the XML model, when the data object concerned is the 
     root object that represents the document object for the document, 
     only three possible values can come back from these 
     four method calls.
     
    </para>

    <para>
     The two method calls that can be made against the document
     are <function>getRootElementName</function> and
     <function>getRootEelementURI</function>.
     These return the element name and namespace of the document element,
     respectively. 
    </para>
    
    <para>
     The two method calls that can be made against any data object are 
     <function>getTypeName</function>
     and 
     <function>getTypeNamespaceURI</function>.
     These return the SDO type name and type namespace of the data object, 
     respectively.
    </para>
    
    <para>
     Always, calling <function>getRootElementURI</function>
     on the document object will return the same value as 
     calling <function>getNamespaceURI</function> on the
     root data object. 
     Essentially, the information is all derived from the first few lines of the 
     schema file,
     where there are three distinct pieces of information.
     For illustration, here again are the first few lines of the 
     letter.xsd that we used above.
    </para>
    
    <programlisting role="xml">
<![CDATA[
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
            xmlns:letter="http://letterSchema"
            targetNamespace="http://letterSchema">
            
  <xsd:element name="letters" type="letter:FormLetter"/>
  
  <xsd:complexType name="FormLetter" mixed="true">
    .../...
]]>
    </programlisting>
 
   <para>
    The three important values are:    
    <itemizedlist>
     <listitem>
      <para>
       <varname>letters</varname>, the name of the document element
      </para>
     </listitem>
     <listitem>
      <para>
       <varname>FormLetter</varname>, the name of the complex type of the document element.
       This is also the name of the SDO type of the root data object.
      </para>
     </listitem>
     <listitem>
      <para>
       <varname>http://letterSchema</varname>, the namespace to which the document element belongs.
       This is also the namespaceURI of the SDO type of the root data object.
      </para>
     </listitem>
    </itemizedlist>
    It is part of the XML-SDO mapping rules that 
    when the SDO model is built from the schema file,
    the typename and namespaceURI of the SDO types for the root element
    are taken
    from those of the complex type of the document element, where it exists.
    Hence in this example the typename of the root data object is FormLetter.
    In the event that there is no separate complex type definition
    for the document element, when the the type is defined inline and is 
    anonymous, 
    the SDO type name will be the same as the element name. 
   </para>
   
   <para>
    The following program loads the letter document and checks the 
    return values from each of the four calls. 
   </para> 
    <programlisting role="php" xml:id="sdo-das-xml.examples.Example5">
     <![CDATA[
<?php
/**
 * Finding out what you can about the document and document element
 * This can be quite hard to understand because there are four calls
 * Two calls are made against the document
 * Two calls are made against the root data object and its model
 * Because of the SDO-XML mapping rules and how the SDO model is derived
 * from the XML model, only three possible values can come back from these four calls.
 * Always, $document->getRootElementURI() == (type of root data object)->namespaceURI 
 * Essentially, it all comes form the first few lines of the xsd:
 * <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
 *   xmlns:letter="http://letterSchema"
 *   targetNamespace="http://letterSchema">
 *   <xsd:element name="letters" type="letter:FormLetter"/>
 */

$xmldas = SDO_DAS_XML::create("letter.xsd");
$document = $xmldas->loadFile("letter.xml");
$root_do = $document->getRootDataObject();

/**
 * The "root element name" is the element name of the document element
 * in this case 'letters'
 * This matches the 'name' attribute of the document element in the xsd and matches
 * the element name from the xml
 */
echo "The document element name is " . $document->getRootElementName() . "\n";
assert($document->getRootElementName() == 'letters'); // a property of the document

/**
 * The "root element URI" is the namespace part of the element name of the document element
 * in this case 'http://letterSchema' since 'letters' is in that namespace
 * This is taken from the xsd and matches the namespace picked up from the xml
 */
echo "The document element is in the namespace " . $document->getRootElementURI() . "\n";
assert($document->getRootElementURI() == 'http://letterSchema'); // a property of the document

/**
 * The type name is taken from the SDO model
 * The XML-SDO mapping rules make this either:
 *   The name of the complexType if there is one (in this case there is)
 *   The document element name if there no complexType
 * This is taken from the xsd 
 */
echo "The type name of the root data object is " . $root_do->getTypeName() . "\n";
assert($root_do->getTypeName() == 'FormLetter');  

/**
 * The type's namespaceURI is taken from the SDO model
 * The XML-SDO mapping rules ensure that this will always be the same as 
 * the namepace URI of the document element
 */
echo "The namespaceURI of the root data object is " . $root_do->getTypeNamespaceURI() . "\n";
assert($root_do->getTypeNamespaceURI() == 'http://letterSchema'); 

?>
  ]]>
    </programlisting>
    <para>
     The output from this program is as follows:
   </para>
   <programlisting role="xml" xml:id="sdo-das-xml.examples.Example5.output">
<![CDATA[
The document element name is letters
The document element is in the namespace http://letterSchema
The type name of the root data object is FormLetter
The namespaceURI of the root data object is http://letterSchema
]]>
   </programlisting>
    
   </example>
   
   <example>

    <title>Printing the SDO model</title>

    <para>
     The XML DAS provides a simple means to see what types and properties 
     have been loaded. The php "print" or "echo" instruction will 
     print out the types and properties. 
    </para>

    <programlisting role="php" xml:id="sdo-das-xml.examples.Example6">
     <![CDATA[
<?php
/**
 * Illustrate printing out the model
 */

$xmldas = SDO_DAS_XML::create("letter.xsd");
print $xmldas;

?>
]]>
    </programlisting>

    <para>
     The output from this program is as follows:
   </para>
   <programlisting role="xml" xml:id="sdo-das-xml.examples.Example6.output">
<![CDATA[
object(SDO_XML_DAS)#1 {
18 types have been defined. The types and their properties are::
1. commonj.sdo:BigDecimal
2. commonj.sdo:BigInteger
3. commonj.sdo:Boolean
4. commonj.sdo:Byte
5. commonj.sdo:Bytes
6. commonj.sdo:ChangeSummary
7. commonj.sdo:Character
8. commonj.sdo:DataObject
9. commonj.sdo:Date
10. commonj.sdo:Double
11. commonj.sdo:Float
12. commonj.sdo:Integer
13. commonj.sdo:Long
14. commonj.sdo:Short
15. commonj.sdo:String
16. commonj.sdo:URI
17. http://letterSchema:FormLetter
    - date (commonj.sdo:String)
    - firstName (commonj.sdo:String)
    - lastName (commonj.sdo:String)
18. http://letterSchema:RootType
    - letters (http://letterSchema:FormLetter)
]]>
   </programlisting>

   </example>

   
  </section>


  <!-- class definition section -->
  <section xml:id='sdo-das-xml.classes'>
  &reftitle.classes;
   <para>
    The XML DAS provides two main classes.
    The first is SDO_DAS_XML which is the main class used to fetch the
    data from the XML source and used to write the data back.
    The second is the SDO_DAS_XML_Document class,
    which represents the data in the XML document.
   </para>
   <para>
    There are also some exception classes which can be thrown
    if errors are found when looking for or parsing the xsd or 
    xml files. 
   </para>

   <section xml:id='sdo-das-xml.class.sdo_das_xml'>
    <title>
     <classname>SDO_DAS_XML</classname>
    </title>
    <para>
     This is the main class of the XML DAS,
     which is used fetch the data from the xml source
     and also used to write the data back.
     Other than the methods to load and save xml files,
    </para>
    <section xml:id='sdo-das-xml.class.SDO_DAS_XML.methods'>
     &reftitle.methods;

     <itemizedlist>

      <listitem>
       <para>
        <link linkend='function.SDO-DAS-XML-create'>create</link>
        This is a static method available in the SDO_DAS_XML class.
        Used to construct an SDO_DAS_XML object.
       </para>
      </listitem>
      <listitem>
       <para>
        <link linkend='function.SDO-DAS-XML-addTypes'>addTypes</link>
        Works in much the same way as <function>create</function> but used
        to add the contents of a second or subsequent schema file to 
        an XML DAS that has already been created.
       </para>
      </listitem>
      <listitem>
       <para>
        <link linkend='function.SDO-DAS-XML-createDataObject'>createDataObject</link>
        Can be used to construct an SDO data object of a given type.
       </para>
      </listitem>
      <listitem>
       <para>
        <link linkend='function.SDO-DAS-XML-createDocument'>createDocument</link>
        Can be used to construct an XML Document object from scratch.
       </para>
      </listitem>
      <listitem>
       <para>
        <link linkend='function.SDO-DAS-XML-loadFile'>loadFile</link>
        Loads the xml instance document from a file.
        This file can be at local file system or it can be on a remote host.
       </para>
      </listitem>
      <listitem>
       <para>
        <link linkend='function.SDO-DAS-XML-loadString'>loadString</link>
        same as the above method.
        Loads the xml instance which is available as string.
       </para>
      </listitem>
      <listitem>
       <para>
        <link linkend='function.SDO-DAS-XML-saveFile'>saveFile</link>
        save SDO_DAS_XML_Document object as a xml file.
       </para>
      </listitem>
      <listitem>
       <para>
        <link linkend='function.SDO-DAS-XML-saveString'>saveString</link>
        save SDO_DAS_XML_Document object as a xml string.
       </para>
      </listitem>

     </itemizedlist>

    </section>
   </section>


   <section xml:id='sdo-das-xml.class.sdo_das_xml_document'>
    <title>
     <classname>SDO_DAS_XML_Document</classname>
    </title>
    <para>
     This class can be used to get to the name and namespace of the document element,
     and to get to the root data object of the document. 
     Lastly, it can also be used to set the XML version and encoding
     of a document on output.
    </para>
    <section xml:id='sdo-das-xml.class.SDO_DAS_XML_Document.methods'>
     &reftitle.methods;
     <itemizedlist>
      <listitem>
       <para>
        <link linkend='function.SDO-DAS-XML-Document-getRootDataObject'>getRootDataObject</link>
        gets the root DataObject.
       </para>
      </listitem>
      <listitem>
       <para>
        <link linkend='function.SDO-DAS-XML-Document-getRootElementName'>getRootElementName</link>
        gets the root DataObject's name.
       </para>
      </listitem>

      <listitem>
       <para>
        <link linkend='function.SDO-DAS-XML-Document-getRootElementURI'>getRootElementURI</link>
        gets the root DataObject's URI.
       </para>
      </listitem>

      <listitem>
       <para>
        <link linkend='function.SDO-DAS-XML-Document-setEncoding'>setEncoding</link>
        sets the encoding string with the given value.
       </para>
      </listitem>

      <listitem>
       <para>
        <link linkend='function.SDO-DAS-XML-Document-setXMLDeclaration'>setXMLDeclaraion</link>
        to set/unset the xml declaration.
       </para>
      </listitem>

      <listitem>
       <para>
        <link linkend='function.SDO-DAS-XML-Document-setXMLVersion'>setXMLVersion</link>
        sets the xml version with the given value.
       </para>
      </listitem>
     </itemizedlist>
    </section>
   </section>

   <section xml:id='sdo-das-xml.class.sdo_das_xml_parserexception'>
    <title>
     <classname>SDO_DAS_XML_ParserException</classname>
    </title>
    <para>
     Is a subclass of
     <classname>SDO_Exception</classname>.
     Thrown for any parser errors while loading the xsd/xml file.
    </para>
   </section>

   <section xml:id='sdo-das-xml.class.sdo_das_xml_fileexception'>
    <title>
     <classname>SDO_DAS_XML_FileException</classname>
    </title>
    <para>
     Is a subclass of
     <classname>SDO_Exception</classname>.
     Thrown by any of the methods that load data from a file, when the file
     cannot be found. 
    </para>
   </section>

  </section>

  <section xml:id='sdo-das-xml.limitations'>
   <title>Limitations compared with SDO 2.0 specification</title>
   <para>
    The 
    <link xlink:href='&url.ibm.sdo;'>SDO 2.0 specification</link>
    defines the mapping between XML types and SDO types.
    With Java SDO, this mapping is implemented by the XMLHelper.
    With SDO for PHP, this mapping is implemented by the
    XML Data Access Service.
    The XML DAS implements the mapping described in the
    SDO 2.0 specification with some restrictions. 
    A detailed list is of the limitations is:
   </para>

   <procedure xml:id='sdo-das-xml.limitations.simpletypes'>
    <title>XML Simple Types</title>
    <step>
     <para>
      Simple Type with sdoJava:instanceClass
      - no PHP equivalent provided.
     </para>
    </step>
    <step>
     <para>
      Simple Type with sdoJava:extendedInstanceClass
      - no PHP equivalent provided.
     </para>
    </step>
    <step>
     <para>
      Simple Type with list of itemType.
     </para>
    </step>
    <step>
     <para>
      Simple Type with union.
     </para>
    </step>
   </procedure>

   <procedure xml:id='sdo-das-xml.limitations.complextypes'>
    <title>XML Complex Types</title>
    <step>
     <para>
      Complex Type with sdo:aliasName
      - no PHP support for SDO Type aliases.
     </para>
    </step>
   </procedure>

   <procedure xml:id='sdo-das-xml.limitations.attribute'>
    <title>XSD Attribute</title>
    <step>
     <para>
      Attribute with sdo:aliasName
      - no PHP support for SDO property aliases.
     </para>
    </step>
    <step>
     <para>
      Attribute with default value
      - no PHP support for SDO property defaults.
     </para>
    </step>
    <step>
     <para>
      Attribute with fixed value
      - no PHP support for SDO read-only properties or default values.
     </para>
    </step>
    <step>
     <para>
      Attribute referencing a DataObject with
      sdo:propertyType - no support for sdo:propertyType="...".
     </para>
    </step>
    <step>
     <para>
      Attribute with bi-directional property to a DataObject with
      sdo:oppositeProperty and sdo:propertyType
      - no PHP support for SDO opposite.
     </para>
    </step>
   </procedure>

   <procedure xml:id='sdo-das-xml.limitations.elements'>
    <title>XSD Elements</title>
    <step>
     <para>
      Element with sdo:aliasName
      - no PHP support for SDO property aliases.
     </para>
    </step>
    <step>
     <para>
      Element with substitution group.
     </para>
    </step>
   </procedure>

   <procedure xml:id='sdo-das-xml.limitations.elementsimpletype'>
    <title>XSD Elements with Simple Type</title>
    <step>
     <para>
      Element of SimpleType with default
      - no PHP support for SDO defaults
     </para>
    </step>
    <step>
     <para>
      Element of SimpleType with fixed value
      - no PHP support for SDO read-only properties or default values.
     </para>
    </step>
    <step>
     <para>
      Element of SimpleType with sdo:string
      - no support for sdo:string="true".
     </para>
    </step>
    <step>
     <para>
      Element referencing a DataObject with
      sdo:propertyType  - no support for sdo:propertyType="..."
     </para>
    </step>
    <step>
     <para>
      Element with bi-directional reference to a DataObject with
      sdo:oppositeProperty and sdo:propertyType
      - no PHP support for SDO opposite.
     </para>
    </step>
   </procedure>
  </section>

 </partintro>
 &reference.sdo-das-xml.entities.functions;
</reference>

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