RE: [xsl] Displaying Code Dependent on First Encounter of Specific Reference

[<Jarno.Elovirta@xxxxxxxxx>]

Hi,

> I'm developing a stylesheet that converts XML to html to
> display research articles. The articles contains three
> citation types, bibliographical, table call, and figure call.
> Upon encountering a table call or figure call, I would like
> to display the table or figure referred to immediately
> following the paragraph that contains the call. I want the
> table or figure to appear in the order they were referred to
> in the paragraph and I want each table or figure to only
> appear once in the outputted document. Tables and figures are
> numbered in order of their reference, though at any point you
> can refer to a table or figure that has been previously called.
>
> Citations look like this:
> <xref ref-type="bibr" rid="B1">1</xref>
> <xref ref-type="table" rid="T1">Table 1</xref>
> <xref ref-type="fig" rid="F1">Figure 1</xref>
>
> Sample Input:
>
> [A paragraph that includes a citation for Table 1.]
> [A paragraph that includes citations for Table 2, Table 1,
> Figure 1, and Table 3.]
>
> Sample Output:
>
> [A paragraph that includes a citation for Table 1.]
>
> Table 1
>
> [A paragraph that includes citations for Table 2, Table 1,
> Figure 1, and Table 3.]
>
> Table 2
> Figure 1
> Table 3
>
>  My initial thought is to create a set of keys:
> Key: Last Table Processed
> Key: Last Figure Processed
> Key: Last Table Encountered
> Key: Last Figure Encountered

How would you declare these, because keys cannot state anything about
processing, they're just indices, really.

> Since the tables and figures are numbered in order, a
> comparison of the two keys should be in order. This
> comparison should be made at the end of processing a
> paragraph. However, I'm not quite sure how I'd make such a
> comparison or even if I can use keys in that manner. I'm
> thinking I might need to generate some sort of array to keep
> track of the multiple citations encountered so that in the
> sample provided the output is (Table 2, Figure 1, Table 3)
> and not (Table 2, Table 3, Figure 1) or (Figure 1, Table 2,
> Table 3). If I were to build an array, since at this point I
> don't need to process <xref> citations of "bibr" type, those
> should be ignored. Any suggestions would be greatly
> appreciated. Thanks.

I think you're overcomplicating things, and you're thinking in terms of
procedural programming, not declarative. Just declare a key

<xsl:key name="xref" match="xref" use="concat(@ref-type, ' ', @rid)"/>

and then, when processing a paragraph

<xsl:template match="para">
  <p>
    <xsl:apply-templates/>
  </p>
  <xsl:for-each select="descendant::xref[generate-id() =
generate-id(key('xref', concat(@ref-type, ' ', @rid)))]">
    <xsl:apply-templates select="." mode="process-link"/>
  </xsl:for-each>
</xsl:template>

I.e. use Muenchian Grouping approach to check if the xref being processed is
the first one in document order.

Cheers,

Jarno