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if($xref->att('keyref')){
 my($h) = $linktext{$xref->att('keyref')}; # the keyref att is the key
+ previously defined for the %linktext hash
...
 } 
$xref->print;
}

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 child 1:
<keyword conref="ds"/>
...
 privileges

<xref keyref="ids_sqs_0147"></xref>

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<citeReference 
   keys="ids_sqs_0147"
   href="../com.ibm.sqls.doc/ids_sqs_0147.dita#ids_sqs_0147">
...
   Database-<b>level</b> privileges
 </linktext>
</citeReference>

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my @children = $citeReference->children;
$linktext{citeReference->att('keys')} = \@children;

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<xref keyref="ids_sqs_0147">some existing text that should get replaced</xref>

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<xref href="../com.ibm.sqls.doc/ids_sqs_0147.dita#ids_sqs_0147">
  <keyword conref="ds"/>
   Database-<b>level</b> privileges
</xref>

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if($xref->att('keyref')){
 my($h) = $linktext{$xref->att('keyref')};
...
 } 
$xref->print;
}

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 child 1:
<keyword conref="ds"/>
...
 privileges

<xref keyref="ids_sqs_0147">Database-level privileges</xref>