| Oracle® Database SQL Language Reference 11g Release 2 (11.2) Part Number E26088-02 | 
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XMLComment generates an XML comment using an evaluated result of value_expr. The value_expr must resolve to a string. It cannot contain two consecutive dashes (hyphens). The value returned by the function takes the following form:
<!--string-->
If value_expr resolves to null, then the function returns null.
See Also:
Oracle XML DB Developer's Guide for more information on this functionThe following example uses the DUAL table to illustrate the XMLComment syntax:
SELECT XMLCOMMENT('OrderAnalysisComp imported, reconfigured, disassembled')
   AS "XMLCOMMENT" FROM DUAL;
 
XMLCOMMENT
--------------------------------------------------------------------------------
<!--OrderAnalysisComp imported, reconfigured, disassembled-->