You want to start a new group if @value is greater than
preceding-sibling::Content/@value.

So you can use

<xsl:for-each-group select="Content" group-starting-with="*[number(@value) gt
number(../preceding-sibling::*/@value) + 30]">
   ...
</xsl:for-each-group>

Michael Kay
Saxonica

> On 17 Nov 2017, at 17:43, rus tle profrustyleafiii@xxxxxxxxxxx
<xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote:
>
> 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=b30">
>     <Content value="0"/>
>     <Content value=b10b/>
>     <Content value=b15b/>
>     <Content value=b18b/>
>     <Content value=b22b/>
>     <Content value=b26b/>
>     <Content value=b34b/>
>     <Content value=b37b/>
>     <Content value=b56b/>
>     <Content value=b99b/>
>     <Content value=b101b/>
>     <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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