How to add a FK-constraint on an attribute

Hi,
I've got an xml file which looks like this:
<?xml version="1.0" encoding="ISO-8859-1"?>
<ScheduledDay ProgramDate="01-05-2003" Channel="CANVAS" xmlns:xdb="http://xmlns.oracle.com/xdb" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="http://wxpp-heremha:8080/teledemo/configuration/EPG.xsd">
 <ScheduledProgram ProviderScheduleId="9000">
 <StartHour>20:00</StartHour>
 <EndHour>21:00</EndHour>
 <Title>TerZake Zomer</Title>
 <Duration>60</Duration>
 <EditionNr>5</EditionNr>
and a table "Channels" with a channel_cd.
I would like to put a FK-constraint on the "Channel"-attribute of the "ScheduledDay"-element.
Is there anyone who knows the correct syntax?
Thanks in advance!!!
Regards
Hans

To use referential integrity you must use object relational storage, that is you have to register an XML Schema.
For better usability you might add an schema annotation SQLName="ATT_CHANNEL" or anyling like this. So in the attribute definition in the XML schema should look like this:
<xs:attrtibute name="Channel" xdb:SQLName="ATT_CHANNEL" ...>
After you have registred the XML Schema, there is a table automatically created. So you can add the constraint like this:
alter table ... add constraint fk_... foriegn key (xmldata.att_channel) references ...
You'll find more Info in the XML DB Basic Demo.
http://otn.oracle.com/tech/xml/xmldb/demonstrations/xdbBasicDemo.zip
Description:
http://otn.oracle.com/tech/xml/xmldb/demonstrations/9202_Demonstration.pdf

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