VOID expressions return no value but are used to
perform other work. The
VOID REMOVE expression removes the specified properties
from the current record.
The names of the properties to be removed are given in
PROP_NAME expression nodes.
See the
EXPRESSION element for DTD and attribute information.
This example evaluates whether the Region property is equal to the
constant Other Italy. If two are equal, then the
REMOVE expression deletes the property.
<EXPRESSION TYPE="VOID" NAME="IF">
<EXPRESSION TYPE="INTEGER" NAME="MATH">
<EXPRNODE NAME="TYPE" VALUE="STRING"/>
<EXPRNODE NAME="OPERATOR" VALUE="EQUAL"/>
<EXPRESSION TYPE="PROPERTY" NAME="IDENTITY">
<EXPRNODE NAME="PROP_NAME" VALUE="Region"/>
</EXPRESSION>
<EXPRESSION TYPE="STRING" NAME="CONST">
<EXPRNODE NAME="VALUE" VALUE="Other Italy"/>
</EXPRESSION>
</EXPRESSION>
<EXPRESSION TYPE="VOID" NAME="REMOVE">
<EXPRNODE NAME="PROP_NAME" VALUE="Region"/>
</EXPRESSION>
</EXPRESSION>
