[xsl] every 4th record increase counter

[Abe Scott <abescott@xxxxxxxxx>]

Greetings,

I'm
trying to create a field that will increase by 1 for every fourth
record, ordered by \CommlVeh\ItemIdInfo\SystemId  (We print 4 records
per page)  The records may be in random order and there may be missing
id's in the list.


So that my output would be similar to:

<Vehicle systemId="1" pageNum="1">
<Vehicle systemId="2" pageNum="1">
<Vehicle systemId="3" pageNum="1">
<Vehicle systemId="4" pageNum="1">
<Vehicle systemId="5" pageNum="2">
<Vehicle systemId="6" pageNum="2">    



Data Sample:

<CommlVeh id="207507" LocationRef="219009">
    <ItemIdInfo>
        <SystemId>1</SystemId>
    </ItemIdInfo>
    <Manufacturer>Make</Manufacturer>
    <Model>Model</Model>
    <ModelYear>2001</ModelYear>
    <VehBodyTypeCd>BType</VehBodyTypeCd>
    <TerritoryCd>124</TerritoryCd>
    <VehIdentificationNumber>111111</VehIdentificationNumber>
</CommlVeh>
<CommlVeh id="207509" LocationRef="219011">
    <ItemIdInfo>
        <SystemId>3</SystemId>
    </ItemIdInfo>
    <Manufacturer>Make</Manufacturer>
    <Model>Model</Model>
    <ModelYear>2001</ModelYear>
    <VehBodyTypeCd>BType</VehBodyTypeCd>
    <TerritoryCd>124</TerritoryCd>
    <VehIdentificationNumber>33333</VehIdentificationNumber>
</CommlVeh>
<CommlVeh id="207510" LocationRef="219013">
    <ItemIdInfo>
        <SystemId>5</SystemId>
    </ItemIdInfo>
    <Manufacturer>Make</Manufacturer>
    <Model>Model</Model>
    <ModelYear>2001</ModelYear>
    <VehBodyTypeCd>BType</VehBodyTypeCd>
    <TerritoryCd>124</TerritoryCd>
    <VehIdentificationNumber>5555</VehIdentificationNumber>
</CommlVeh>
<CommlVeh id="207512" LocationRef="219012">
    <ItemIdInfo>
        <SystemId>4</SystemId>
    </ItemIdInfo>
    <Manufacturer>Make</Manufacturer>
    <Model>Model</Model>
    <ModelYear>2001</ModelYear>
    <VehBodyTypeCd>BType</VehBodyTypeCd>
    <TerritoryCd>124</TerritoryCd>
    <VehIdentificationNumber>444444</VehIdentificationNumber>
</CommlVeh>
<CommlVeh id="207508" LocationRef="219010">
    <ItemIdInfo>
        <SystemId>2</SystemId>
    </ItemIdInfo>
    <Manufacturer>Make</Manufacturer>
    <Model>Model</Model>
    <ModelYear>2001</ModelYear>
    <VehBodyTypeCd>BType</VehBodyTypeCd>
    <TerritoryCd>124</TerritoryCd>
    <VehIdentificationNumber>22222</VehIdentificationNumber>
</CommlVeh>
<CommlVeh id="207511" LocationRef="219014">
    <ItemIdInfo>
        <SystemId>6</SystemId>
    </ItemIdInfo>
    <Manufacturer>Make</Manufacturer>
    <Model>Model</Model>
    <ModelYear>2001</ModelYear>
    <VehBodyTypeCd>BType</VehBodyTypeCd>
    <TerritoryCd>124</TerritoryCd>
    <VehIdentificationNumber>600007777</VehIdentificationNumber>
</CommlVeh>