[xsl] Adjacent grouping?

Hello All,

I am trying to remove attribute values in a list based on a frequency parameter.

Is this possible in XSLT 2? I cannot see how to tackle the problem without 
being able to store the last attribute value added to the result tree so that I 
can compare against it for the following attribute values? I am told that there 
is no way to query the result tree and so I am at a loss as to whether XSLT can 
actually do what I require?

To illustrate, please see the example below.

The frequency parameter is 30. I would like to remove all values that are 
"within 30" of the last value used. If the first value is 0 then I would like 
to remove all the following attribute values that are less than 30 plus the 
last value added to the result tree (in this case 0). The only way I can think 
to do this is by somehow caching the last value that was copied to the result 
tree so I can compare against it with the next value.

It was suggested to me that adjacent grouping my work? I am a recent beginner 
to XSLT and would love to learn more about how it might help me achieve the 
result I am looking for?

Thanks,

Rusty

Before:

<p frequency=“30">
    <Content value="0"/>
    <Content value=”10”/> 
    <Content value=”15”/> 
    <Content value=”18”/> 
    <Content value=”22”/> 
    <Content value=”26”/> 
    <Content value=”34”/> 
    <Content value=”37”/> 
    <Content value=”56”/> 
    <Content value=”99”/> 
    <Content value=”101”/>
    <Content value="115"/> 
    <Content value="118"/>
    <Content value="129"/>
</p>
After:

<p frequency="30">
    <Content value="00"/>
    <Content value=""/> 
    <Content value=""/> 
    <Content value=""/> 
    <Content value=""/> 
    <Content value=""/> 
    <Content value="34"/> 
    <Content value=""/> 
    <Content value=""/> 
    <Content value="99"/> 
    <Content value=""/>
    <Content value=""/> 
    <Content value=""/>
    <Content value="129"/>
</p>
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