XMLCDATA

Syntax

Description of the illustration XMLCdata.gif

Purpose

XMLCData generates a CDATA section by evaluating value_expr. The value_expr must resolve to a string. The value returned by the function takes the following form:

<![CDATA[string]]>

If the resulting value is not a valid XML CDATA section, then the function returns an error.The following conditions apply to XMLCData:

• The value_expr cannot contain the substring ]]>.

• If value_expr evaluates to null, then the function returns null.

Examples

The following statement uses the DUAL table to illustrate the syntax of XMLCData:

SELECT XMLELEMENT("PurchaseOrder",
   XMLAttributes(dummy as "pono"),
   XMLCdata('<!DOCTYPE po_dom_group [
   <!ELEMENT po_dom_group(student_name)*>
   <!ELEMENT po_purch_name (#PCDATA)>
   <!ATTLIST po_name po_no ID #REQUIRED>
   <!ATTLIST po_name trust_1 IDREF #IMPLIED>
   <!ATTLIST po_name trust_2 IDREF #IMPLIED>
   ]>')) "XMLCData" FROM DUAL;
 
XMLCData
----------------------------------------------------------
<PurchaseOrder pono="X"><![CDATA[
<!DOCTYPE po_dom_group [
   <!ELEMENT po_dom_group(student_name)*>
   <!ELEMENT po_purch_name (#PCDATA)>
   <!ATTLIST po_name po_no ID #REQUIRED>
   <!ATTLIST po_name trust_1 IDREF #IMPLIED>
   <!ATTLIST po_name trust_2 IDREF #IMPLIED>
   ]>
  ]]>
</PurchaseOrder>