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     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.
    </p></div>
    
    <div class="example-contents">
<div class="cdata"><pre>
&lt;xsd:schema xmlns:xsd=&quot;http://www.w3.org/2001/XMLSchema&quot;
            xmlns:letter=&quot;http://letterSchema&quot;
            targetNamespace=&quot;http://letterSchema&quot;&gt;
            
  &lt;xsd:element name=&quot;letters&quot; type=&quot;letter:FormLetter&quot;/&gt;
  
  &lt;xsd:complexType name=&quot;FormLetter&quot; mixed=&quot;true&quot;&gt;
    .../...
</pre></div>
    </div>

 
   <div class="example-contents"><p>
    The three important values are:    
    <ul class="itemizedlist">
     <li class="listitem">
      <p class="para">
       <var class="varname">letters</var>, the name of the document element
      </p>
     </li>
     <li class="listitem">
      <p class="para">
       <var class="varname">FormLetter</var>, the name of the complex type of the document element.
       This is also the name of the SDO type of the root data object.
      </p>
     </li>
     <li class="listitem">
      <p class="para">
       <var class="varname">http://letterSchema</var>, the namespace to which the document element belongs.
       This is also the namespaceURI of the SDO type of the root data object.
      </p>
     </li>
    </ul>
    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. 
   </p></div>
   
   <div class="example-contents"><p>
    The following program loads the letter document and checks the 
    return values from each of the four calls. 
   </p></div> 
    <div class="example-contents">
     <div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br /></span><span style="color: #FF8000">/**<br />&nbsp;*&nbsp;Finding&nbsp;out&nbsp;what&nbsp;you&nbsp;can&nbsp;about&nbsp;the&nbsp;document&nbsp;and&nbsp;document&nbsp;element<br />&nbsp;*&nbsp;This&nbsp;can&nbsp;be&nbsp;quite&nbsp;hard&nbsp;to&nbsp;understand&nbsp;because&nbsp;there&nbsp;are&nbsp;four&nbsp;calls<br />&nbsp;*&nbsp;Two&nbsp;calls&nbsp;are&nbsp;made&nbsp;against&nbsp;the&nbsp;document<br />&nbsp;*&nbsp;Two&nbsp;calls&nbsp;are&nbsp;made&nbsp;against&nbsp;the&nbsp;root&nbsp;data&nbsp;object&nbsp;and&nbsp;its&nbsp;model<br />&nbsp;*&nbsp;Because&nbsp;of&nbsp;the&nbsp;SDO-XML&nbsp;mapping&nbsp;rules&nbsp;and&nbsp;how&nbsp;the&nbsp;SDO&nbsp;model&nbsp;is&nbsp;derived<br />&nbsp;*&nbsp;from&nbsp;the&nbsp;XML&nbsp;model,&nbsp;only&nbsp;three&nbsp;possible&nbsp;values&nbsp;can&nbsp;come&nbsp;back&nbsp;from&nbsp;these&nbsp;four&nbsp;calls.<br />&nbsp;*&nbsp;Always,&nbsp;$document-&gt;getRootElementURI()&nbsp;==&nbsp;(type&nbsp;of&nbsp;root&nbsp;data&nbsp;object)-&gt;namespaceURI&nbsp;<br />&nbsp;*&nbsp;Essentially,&nbsp;it&nbsp;all&nbsp;comes&nbsp;form&nbsp;the&nbsp;first&nbsp;few&nbsp;lines&nbsp;of&nbsp;the&nbsp;xsd:<br />&nbsp;*&nbsp;&lt;xsd:schema&nbsp;xmlns:xsd="http://www.w3.org/2001/XMLSchema"<br />&nbsp;*&nbsp;&nbsp;&nbsp;xmlns:letter="http://letterSchema"<br />&nbsp;*&nbsp;&nbsp;&nbsp;targetNamespace="http://letterSchema"&gt;<br />&nbsp;*&nbsp;&nbsp;&nbsp;&lt;xsd:element&nbsp;name="letters"&nbsp;type="letter:FormLetter"/&gt;<br />&nbsp;*/<br /><br /></span><span style="color: #0000BB">$xmldas&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">SDO_DAS_XML</span><span style="color: #007700">::</span><span style="color: #0000BB">create</span><span style="color: #007700">(</span><span style="color: #DD0000">"letter.xsd"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$document&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">$xmldas</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">loadFile</span><span style="color: #007700">(</span><span style="color: #DD0000">"letter.xml"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$root_do&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">$document</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">getRootDataObject</span><span style="color: #007700">();<br /><br /></span><span style="color: #FF8000">/**<br />&nbsp;*&nbsp;The&nbsp;"root&nbsp;element&nbsp;name"&nbsp;is&nbsp;the&nbsp;element&nbsp;name&nbsp;of&nbsp;the&nbsp;document&nbsp;element<br />&nbsp;*&nbsp;in&nbsp;this&nbsp;case&nbsp;'letters'<br />&nbsp;*&nbsp;This&nbsp;matches&nbsp;the&nbsp;'name'&nbsp;attribute&nbsp;of&nbsp;the&nbsp;document&nbsp;element&nbsp;in&nbsp;the&nbsp;xsd&nbsp;and&nbsp;matches<br />&nbsp;*&nbsp;the&nbsp;element&nbsp;name&nbsp;from&nbsp;the&nbsp;xml<br />&nbsp;*/<br /></span><span style="color: #007700">echo&nbsp;</span><span style="color: #DD0000">"The&nbsp;document&nbsp;element&nbsp;name&nbsp;is&nbsp;"&nbsp;</span><span style="color: #007700">.&nbsp;</span><span style="color: #0000BB">$document</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">getRootElementName</span><span style="color: #007700">()&nbsp;.&nbsp;</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">assert</span><span style="color: #007700">(</span><span style="color: #0000BB">$document</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">getRootElementName</span><span style="color: #007700">()&nbsp;==&nbsp;</span><span style="color: #DD0000">'letters'</span><span style="color: #007700">);&nbsp;</span><span style="color: #FF8000">//&nbsp;a&nbsp;property&nbsp;of&nbsp;the&nbsp;document<br /><br />/**<br />&nbsp;*&nbsp;The&nbsp;"root&nbsp;element&nbsp;URI"&nbsp;is&nbsp;the&nbsp;namespace&nbsp;part&nbsp;of&nbsp;the&nbsp;element&nbsp;name&nbsp;of&nbsp;the&nbsp;document&nbsp;element<br />&nbsp;*&nbsp;in&nbsp;this&nbsp;case&nbsp;'http://letterSchema'&nbsp;since&nbsp;'letters'&nbsp;is&nbsp;in&nbsp;that&nbsp;namespace<br />&nbsp;*&nbsp;This&nbsp;is&nbsp;taken&nbsp;from&nbsp;the&nbsp;xsd&nbsp;and&nbsp;matches&nbsp;the&nbsp;namespace&nbsp;picked&nbsp;up&nbsp;from&nbsp;the&nbsp;xml<br />&nbsp;*/<br /></span><span style="color: #007700">echo&nbsp;</span><span style="color: #DD0000">"The&nbsp;document&nbsp;element&nbsp;is&nbsp;in&nbsp;the&nbsp;namespace&nbsp;"&nbsp;</span><span style="color: #007700">.&nbsp;</span><span style="color: #0000BB">$document</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">getRootElementURI</span><span style="color: #007700">()&nbsp;.&nbsp;</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">assert</span><span style="color: #007700">(</span><span style="color: #0000BB">$document</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">getRootElementURI</span><span style="color: #007700">()&nbsp;==&nbsp;</span><span style="color: #DD0000">'http://letterSchema'</span><span style="color: #007700">);&nbsp;</span><span style="color: #FF8000">//&nbsp;a&nbsp;property&nbsp;of&nbsp;the&nbsp;document<br /><br />/**<br />&nbsp;*&nbsp;The&nbsp;type&nbsp;name&nbsp;is&nbsp;taken&nbsp;from&nbsp;the&nbsp;SDO&nbsp;model<br />&nbsp;*&nbsp;The&nbsp;XML-SDO&nbsp;mapping&nbsp;rules&nbsp;make&nbsp;this&nbsp;either:<br />&nbsp;*&nbsp;&nbsp;&nbsp;The&nbsp;name&nbsp;of&nbsp;the&nbsp;complexType&nbsp;if&nbsp;there&nbsp;is&nbsp;one&nbsp;(in&nbsp;this&nbsp;case&nbsp;there&nbsp;is)<br />&nbsp;*&nbsp;&nbsp;&nbsp;The&nbsp;document&nbsp;element&nbsp;name&nbsp;if&nbsp;there&nbsp;no&nbsp;complexType<br />&nbsp;*&nbsp;This&nbsp;is&nbsp;taken&nbsp;from&nbsp;the&nbsp;xsd&nbsp;<br />&nbsp;*/<br /></span><span style="color: #007700">echo&nbsp;</span><span style="color: #DD0000">"The&nbsp;type&nbsp;name&nbsp;of&nbsp;the&nbsp;root&nbsp;data&nbsp;object&nbsp;is&nbsp;"&nbsp;</span><span style="color: #007700">.&nbsp;</span><span style="color: #0000BB">$root_do</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">getTypeName</span><span style="color: #007700">()&nbsp;.&nbsp;</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">assert</span><span style="color: #007700">(</span><span style="color: #0000BB">$root_do</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">getTypeName</span><span style="color: #007700">()&nbsp;==&nbsp;</span><span style="color: #DD0000">'FormLetter'</span><span style="color: #007700">);&nbsp;&nbsp;<br /><br /></span><span style="color: #FF8000">/**<br />&nbsp;*&nbsp;The&nbsp;type's&nbsp;namespaceURI&nbsp;is&nbsp;taken&nbsp;from&nbsp;the&nbsp;SDO&nbsp;model<br />&nbsp;*&nbsp;The&nbsp;XML-SDO&nbsp;mapping&nbsp;rules&nbsp;ensure&nbsp;that&nbsp;this&nbsp;will&nbsp;always&nbsp;be&nbsp;the&nbsp;same&nbsp;as&nbsp;<br />&nbsp;*&nbsp;the&nbsp;namepace&nbsp;URI&nbsp;of&nbsp;the&nbsp;document&nbsp;element<br />&nbsp;*/<br /></span><span style="color: #007700">echo&nbsp;</span><span style="color: #DD0000">"The&nbsp;namespaceURI&nbsp;of&nbsp;the&nbsp;root&nbsp;data&nbsp;object&nbsp;is&nbsp;"&nbsp;</span><span style="color: #007700">.&nbsp;</span><span style="color: #0000BB">$root_do</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">getTypeNamespaceURI</span><span style="color: #007700">()&nbsp;.&nbsp;</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">assert</span><span style="color: #007700">(</span><span style="color: #0000BB">$root_do</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">getTypeNamespaceURI</span><span style="color: #007700">()&nbsp;==&nbsp;</span><span style="color: #DD0000">'http://letterSchema'</span><span style="color: #007700">);&nbsp;<br /><br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
    </div>

    <div class="example-contents"><p>
     The output from this program is as follows:
   </p></div>
   <div class="example-contents">
<div class="cdata"><pre>
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
</pre></div>
   </div>

    
   </div>
   
   <div class="example">

    <p><b>Example #6 Printing the SDO model</b></p>

    <div class="example-contents"><p>
     The XML DAS provides a simple means to see what types and properties 
     have been loaded. The php &quot;print&quot; or &quot;echo&quot; instruction will 
     print out the types and properties. 
    </p></div>

    <div class="example-contents">
     <div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br /></span><span style="color: #FF8000">/**<br />&nbsp;*&nbsp;Illustrate&nbsp;printing&nbsp;out&nbsp;the&nbsp;model<br />&nbsp;*/<br /><br /></span><span style="color: #0000BB">$xmldas&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">SDO_DAS_XML</span><span style="color: #007700">::</span><span style="color: #0000BB">create</span><span style="color: #007700">(</span><span style="color: #DD0000">"letter.xsd"</span><span style="color: #007700">);<br />print&nbsp;</span><span style="color: #0000BB">$xmldas</span><span style="color: #007700">;<br /><br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
    </div>


    <div class="example-contents"><p>
     The output from this program is as follows:
   </p></div>
   <div class="example-contents">
<div class="cdata"><pre>
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)
</pre></div>
   </div>


   </div>

   
</div>
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