Hi XSL-List members,
I have been learning my way around XSLT (2.0) over the past couple of weeks,
principally using Saxon-B 9.1. I have an immediate need to transform existing
XML data, initially to HTML. The XML contains, similar to SVG, space-tokenized
numerical data held within attributes. What I am having trouble understanding
is how to transform several nodes with such data into individual columns of
data.
The XML is like this:
<MultiLine samples="5">
<Line title="Line 1" data="0.1 0.4 0.6 0.4 0..8" />
<Line title="Line 2" data="0.4 0.2 0.5 1.4 3.8" />
</MultiLine>
There can be any number of <Line> nodes (typically 3 or 4) and the number of
values (samples) in each data attribute for each <Line> must match the samples
attribute of the parent <MultiLine> node. The number of samples can be very
long, typically several thousand. At present this is the data that I am being
supplied, so regardless of any shortcomings of the structure (although
suggestions for improvement are welcome) I am stuck with it.
I want to transform such data into, e.g., HTML columns, like:
<TABLE>
<TR>
<TH>Line 1</TH><TH>Line 2</TH>
</TR>
<TR>
<TD>0.1</TD><TD>0.4</TD>
</TR>
<TR>
<TD>0.4</TD><TD>0.2</TD>
</TR>
<TR>
<TD>0.6</TD><TD>0.5</TD>
</TR>
...
</TABLE>
I have seen similar questions where people have wanted to transpose HTML table
data, but the problem here is that the input data has to be tokenized. I can
output the data sequentially for each Line with a template such as:
<xsl:template match="Line">
<TR><TH><xsl:value-of select="@title" /></TH><TR>
<xsl:for-each select="tokenize(@data,' ')">
<TR><TD>
<xsl:value-of select="position()" />
</TD></TR>
<xsl:value-of select="." />
</xsl:for-each>
</xsl:template>
To format the data as adjacent columns the only approach I can think of is a
for-each loop over the number of samples, and in each case call
index-at(tokenize(../Line[n]/@data, ' '), position()) for each Line. But this
looks horribly inefficient, since I appear to be tokenizing every @data
attribute repeatedly, presumably giving complexity O(count(Line)*samples^2).
What would be far more preferable is to tokenize all the lines, and then at
each index obtain the appropriate value from each sequence. But I have no idea
how to do that in XSLT.
I have spent at least a day trying to solve this conumdrum, so if anyone has
any suggestions I would be very grateful.
Kind regards,
Beldaz
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