How to include CDATA in xml generated from XQuery

I need to include Cdata in the xml generated from my xquery which is given below:
I tried using XMLCDATA, but not getting the desired output. What am I doing wrong?
SELECT XMLQuery('<InsUpdDel>
for $crv in ora:view("RELATION")
return
<first>
<eff_date>{$crv/ROW/EFF_DATE/text()}</eff_date>
<source>{$crv/ROW/SOURCE/text()}</source>
<key>
<fld>
<id>from_type</id>
<val>XMLCDATA({$crv/ROW/FROM_ENT_TYPE/text()})</val>
</fld>
<fld>
<id>from_ent_id</id>
<val>{$crv/ROW/FROM_ENT_ID/text()}</val>
</fld>
</key>
</first>}</InsUpdDel>'
RETURNING CONTENT)
FROM dual;
The output I get is XMLCDATA(C), while the desired output is <![CDATA[C]]>

Forgive me my vanity to think I can contribute by kicking doors open that are probably already wide open....I might create more confusion, but perhaps it helps some of the readers of this thread....
In general it is not such a good idea to use "string" functions to create (serialized) XML. XML tools (including Oracle XML DB) go through a lot of effort to make sure that when a "native" XML structure is serialized to a string, the XML rules are strictly obeyed (e.g. special character escaping).
Just assume e.g. that the $i/Reference from above contains something like ]]><
The resulting XML would not be valid.
More info on serializing XML in the context of XQuery is available from
- http://www.w3.org/TR/xquery/#id-serialization
- http://www.w3.org/TR/xslt-xquery-serialization/
- http://www.w3.org/TR/xslt-xquery-serialization/#XML_CDATA-SECTION-ELEMENTS
Unfortunately I do not think Oracle XML DB currently implements these parts of the spec (perhaps 11g will)...leaving the OP's question unanswered.
Anyway, if going the route of serializing the XML through string functions, it is always good to realize the dangers of such an approach.
Peter

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