Re: [xsl] Adjacent grouping?

Subject: Re: [xsl] Adjacent grouping?
From: "Michael Kay mike@xxxxxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>
Date: Fri, 17 Nov 2017 18:00:37 -0000
Sorry, I misread the requirement. You want a new group if the value is 30+
greater than the FIRST value in the previous group, whereas I thought you were
comparing with the LAST value in the previous group.

No, I don't think this can be done with grouping: it needs full recursion (or
in XSLT 3.0, xsl:iterate).

Using xsl:iterate it would be

<xsl:iterate select="Content">
  <xsl:param name="previous" as="xs:integer?" select="()"/>
    <xsl:when test="empty($previous) or xs:integer(@value) gt @previous+30">
      <Content value="{@value}"/>
         <xsl:with-param name="previous" select="@value"/>
      <Content value=""/>

Michael Kay

> On 17 Nov 2017, at 17:51, Michael Kay mike@xxxxxxxxxxxx
<xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote:
> You want to start a new group if @value is greater than
> 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
<mailto:profrustyleafiii@xxxxxxxxxxx> <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx
<mailto:xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>> wrote:
>> Hello All,
>> I am trying to remove attribute values in a list based on a frequency
>> 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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