Question

Looping through nodes in XML using XSLT

Asked by: webtechy

Dear All,

I have some XML as follows:

<FormData>
<Data>
  <Date value="14 Nov 2005"/>
  <Location value="1001"/>
  <InStation1 value="Y"/>
  <T1 value="A"/>
  <InStation2 value="N"/>
  <T2 value="B"/>
  <InStation3 value="Y"/>
  <T3 value="B"/>
</Data>
<Data>
  <Date value="14 Nov 2005"/>
  <Location value="1001"/>
  <InStation1 value="Y"/>
  <T1 value="A"/>
  <InStation2 value="N"/>
  <T2 value="B"/>
  <InStation3 value="Y"/>
  <T3 value="B"/>
</Data>
</FormData>

I can't change the XML, but rather than having to write out XSLT for InStation1 - InStation3 and T1 - T3, I was wondering if there was a way to get the XSLT to loop through them so I only need to write a few lines of XSLT (of course, in reality I have more than just the three!). At the moment, I am doing:

<xsl:value-of select="InStation1/@value"/>
<xsl:value-of select="T1/@value"/>
<xsl:value-of select="InStation2/@value"/>
<xsl:value-of select="T2/@value"/>
<xsl:value-of select="InStation3/@value"/>
<xsl:value-of select="T3/@value"/>

Any help much appreciated!

Regards,

Ben.

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Asked On
2005-11-21 at 02:31:19ID21637888
Tags

through

,

nodes

,

loop

,

xslt

,

xml

Topic

Extensible Markup Language (XML)

Participating Experts
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Points
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Comments
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Answers

 

by: GertonePosted on 2005-11-21 at 02:38:13ID: 15332744

<xsl:for-each select="*[@value]">
   <xsl:value-of select="@value"/>
</xsl:for-each>

loop over all th eelements that have an attribute value

 

by: metalmickeyPosted on 2005-11-21 at 02:39:27ID: 15332750

Im not sure, but if you are looking for children of a particular node, eg data

you could use : for each instance of data look for children (*) which have @value

so

data/*/@value

should be the right xpath

MM

 

by: GertonePosted on 2005-11-21 at 02:45:19ID: 15332778

webtechy,

It might be that you want to exclude "Date" and "Location"
Here is the loop that takes all the "Data" children that have a name starting with 'T' or 'InStation'

       <xsl:for-each select="*[starts-with(name(), 'T') or starts-with(name(), 'InStation')]">
            <xsl:value-of select="@value"/>###
        </xsl:for-each>

both this answer and the previous assume you are doing this in the context of "Data"
safe assumption since your <xsl:value-of select="InStation1/@value"/>
 seems to work

cheers

 

by: webtechyPosted on 2005-11-21 at 02:45:57ID: 15332782

I need to be able to be more specific with the selection, e.g.

<xsl:for-each select="T[*]">
   <xsl:value-of select="T[*]/@value"/>
</xsl:for-each>

Or something like that (I assume that doesn't work)

 

by: GertonePosted on 2005-11-21 at 02:48:20ID: 15332790

<xsl:for-each select="T[*]">
   <xsl:value-of select="T[*]/@value"/>
</xsl:for-each>

my previous post should have given you that
please note that inside the for-each loop,
the context changes
so    <xsl:value-of select="T[*]/@value"/>
will not work
   <xsl:value-of select="@value"/>
will work

 

by: webtechyPosted on 2005-11-21 at 02:52:33ID: 15332807

Hi Gertone,

Thanks for that - although my response came after yours I hadn't seen your post. Your post looks promising ... I'll give it a go. Thanks.

 

by: GertonePosted on 2005-11-21 at 02:54:36ID: 15332817

webtechy,

To take away all confusion
select="T[*]"
is the element with name 'T' that has a subelement (name '*', so undefined)

before the [] you have the path of the node you are looking for
the [] (called predicate) creates a specific condition

what you wrote in pseudocode
is *[starts-with(name(), 'T')] in real XPath

the element '*' (means can be any name)
that has a name that starts with a 'T'

there is a way to guarantuee that the remainder is an integer but that is a bit more complex

If you are sure you don't have an element like "Tate" you don't won't to address,
I would leave it like this

cheers

 

by: GertonePosted on 2005-11-21 at 02:55:24ID: 15332821

webtechy,
>  I hadn't seen your post.

I already guessed that, they came in the same minute :-)

 

by: GertonePosted on 2005-11-21 at 04:47:30ID: 15333264

webtechy,
> <Data>
>   <Date value="14 Nov 2005"/>
>   <Location value="1001"/>
>   <InStation1 value="Y"/>
>   <T1 value="A"/>
>   <InStation2 value="N"/>
>   <T2 value="B"/>
>   <InStation3 value="Y"/>
>   <T3 value="B"/>
> </Data>

as you said, you can't change the XML, you probably realise this is very bad modelling practice.
With the element names you should try to give some sort of meaningfull structure
dynamic data belongs in an attribute value or the content, not in ever changing element names.
XML created this way, is very hard to process or validate
or very difficult to document

On top of that I have the feeling this XML tries to combine values based on the number in the tagname

I would definitely go for an XML like this

<Data>
  <Date value="14 Nov 2005"/>
  <Location value="1001"/>
  <Station id="1">
    <InStation>Y</InStation>
    <T>A</T>
  </Station>
  <Station id="2">
    <InStation>N</InStation>
    <T>B</T>
  </Station>
  <Station id="3">
    <InStation>Y</InStation>
    <T>B</T>
  </Station>
 </Data>

This gives you an explicit grouping of "Instation" and "T"
and a clear model of Station

but perhaps you already knew
cheers

Geert

 

by: webtechyPosted on 2005-11-21 at 08:48:52ID: 15335078

Yeah, the XML is auto-generated by an electronic forms package. I was thinking I would therefore not be able to change the XML output, however, changing the way it is built I can indeed get much better formed XML. Anyway - both of your suggestions are right! :-)

20120131-EE-VQP-002

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