xpath-expression gives an error using > symbol

[petem103072]

I am trying to filter messages using the following xml:

 	<int:filter id="channel1000Filter" input-channel="xmlMsgChannel" output-channel="channel1000" ref="fltNumberLE1000Selector"/>
	<int-xml:xpath-selector id="fltNumberLE1000Selector" evaluation-result-type="boolean" >
		<int-xml:xpath-expression expression="//Header/NRIFLT[<= 1000]"  />
	</int-xml:xpath-selector>

I know that the standard expression language calls for using le, but this is how you would write the xpath expression. I tried using le instead, and it also throws an error about unexpected tokens.