sampleXmlFilter.xml

<?xml version="1.0"?>
<presets>
    <preset name="byDrawing">
        <valueRelation>
            <Layer>drawings</Layer>
            <keyColumn>pkuid</keyColumn>
            <valueColumn>name</valueColumn>
        </valueRelation>
        <operator>=</operator> <!--  =,<,>, <=, >=,like   -->
        <column>drawing</column>
		<autoValueList>True</autoValueList> <!--  auto update filter value pick list  -->
    </preset>
	
	  <preset name="byClass">
        <valueRelation>
            <Layer>drawings</Layer>
            <keyColumn>pkuid</keyColumn>
            <valueColumn>class</valueColumn>
        </valueRelation>
        <operator>=</operator>
        <column>drawing</column>
		<autoValueList>True</autoValueList> <!--  auto update filter value pick list  -->
    </preset>
	
    <preset name="by min Linesize">
        <operator>></operator>
        <column>size</column> 
        <column>linesize</column> <!--  note that column differs between layers  -->
		<autoValueList>False</autoValueList> <!--  optional, false by default  -->
	</preset>
</presets>