ExtractValue

Question

How can i do things like this:
select ExtractValue(XMLType('<t>
                                <t1>t1</t1>
                                <t2>t2</t2>
                             </t>'),'t')
  from dualFrom that select statement i want to get something like this:
<t>
   <t1>t1</t1>
   <t2>t2</t2>
</t>And i whant to use ExtractValue because it convert escape character well.
How to select all this ?

Answer 1

The definition of extractValue*( is that it produces a SQL Scalar type from an XML Scalar node (text() or attributeValue). It cannot be used to generate XML from XML....
Also the XML spec states that certain characters must be escaped in order for the document to be valid XML, so if you unescape these characters you no longer have valid XML..
You may be able to do what you want by using XMLSERIALIZE or EXTRACT() to covert your XML to a VARCHAR2 or CLOB and then DBMS_XMLGEN.CONVERT to do the unescaping but what you end up with will be a CLOB containing an invalid XML Serialization.