How can I group siblings in a flat XML
Pregunta
I have the following part of an XML (It's ODF)
<office:body>
<office:text text:use-soft-page-breaks="true">
<text:h text:style-name="P1" text:outline-level="1">Heading 1</text:h>
<text:p text:style-name="P2">Paragraph 1</text:p>
<text:h text:style-name="P3" text:outline-level="2">Heading 2</text:h>
<text:p text:style-name="P4">Paragraph 2</text:p>
<text:p text:style-name="P5">Paragraph 3</text:p>
<text:h text:style-name="P6" text:outline-level="3">Heading 3</text:h>
<text:p text:style-name="P7">Paragraph 4</text:p>
<text:p text:style-name="P8">Paragraph 5</text:p>
<text:p text:style-name="P9">Paragraph 6</text:p>
<text:h text:style-name="P10" text:outline-level="4">Heading 4</text:h>
<text:p text:style-name="P11">Paragraph 7</text:p>
<text:h text:style-name="P12" text:outline-level="2">Heading 2</text:h>
<text:p text:style-name="P13">Paragraph 8</text:p>
<text:p text:style-name="P14">Paragraph 9</text:p>
<text:p text:style-name="Normal">
<text:span text:style-name="T15">Paragraph 10</text:span>
</text:p>
</office:text>
</office:body>
I need to transform this to
<Blocks>
<Block>
<Title><![CDATA[Heading 2]]></Title>
<Content>
<![CDATA[<p>Paragraph 2</p><p>Paragraph 3</p><h3>Heading 3</h3><p>Paragraph 4</p><p>Paragraph 5</p><p>Paragraph 6</p><h4>Heading 4</h4><p>Paragraph 7</p>]]>
</Content>
</Block>
<Block>
<Title><![CDATA[Heading 2]]></Title>
<Content>
<![CDATA[<p>Paragraph 8</p><p>Paragraph 9</p><p>Paragraph 10</p>]]>
</Content>
</Block>
</Blocks>
As you can see, I want to create a Block
element for each text:h/@text:outline-level = 2
node.
All following text:p
and text:h/@text:outline-level > 2
siblings should be placed in a Content
element inside the just created Block
element.
How can I achieve that?
Solución
Here is a partial solution:
<xsl:stylesheet
version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:office="http://example.com/office"
xmlns:text="http://example.com/text"
exclude-result-prefixes="office text">
<xsl:output indent="yes" cdata-section-elements="Title"/>
<xsl:key
name="k1"
match="text:p"
use="generate-id(preceding-sibling::text:h[@text:outline-level = 2][1])"/>
<xsl:key
name="k1"
match="text:h[@text:outline-level > 2]"
use="generate-id(preceding-sibling::text:h[@text:outline-level = 2])"/>
<xsl:template match="office:text">
<Blocks>
<xsl:apply-templates select="text:h[@text:outline-level = 2]"/>
</Blocks>
</xsl:template>
<xsl:template match="text:h[@text:outline-level = 2]">
<Block>
<Title>
<xsl:value-of select="."/>
</Title>
<Content>
<xsl:apply-templates select="key('k1', generate-id())"/>
</Content>
</Block>
</xsl:template>
<xsl:template match="text:p">
<p>
<xsl:apply-templates/>
</p>
</xsl:template>
<xsl:template match="text:h[@text:outline-level = 3]">
<h3>
<xsl:apply-templates/>
</h3>
</xsl:template>
<xsl:template match="text:h[@text:outline-level = 4]">
<h4>
<xsl:apply-templates/>
</h4>
</xsl:template>
</xsl:stylesheet>
It transforms
<office:body xmlns:office="http://example.com/office" xmlns:text="http://example.com/text">
<office:text text:use-soft-page-breaks="true">
<text:h text:style-name="P1" text:outline-level="1">Heading 1</text:h>
<text:p text:style-name="P2">Paragraph 1</text:p>
<text:h text:style-name="P3" text:outline-level="2">Heading 2</text:h>
<text:p text:style-name="P4">Paragraph 2</text:p>
<text:p text:style-name="P5">Paragraph 3</text:p>
<text:h text:style-name="P6" text:outline-level="3">Heading 3</text:h>
<text:p text:style-name="P7">Paragraph 4</text:p>
<text:p text:style-name="P8">Paragraph 5</text:p>
<text:p text:style-name="P9">Paragraph 6</text:p>
<text:h text:style-name="P10" text:outline-level="4">Heading 4</text:h>
<text:p text:style-name="P11">Paragraph 7</text:p>
<text:h text:style-name="P12" text:outline-level="2">Heading 2</text:h>
<text:p text:style-name="P13">Paragraph 8</text:p>
<text:p text:style-name="P14">Paragraph 9</text:p>
<text:p text:style-name="Normal">
<text:span text:style-name="T15">Paragraph</text:span>
</text:p>
</office:text>
</office:body>
into
<Blocks>
<Block>
<Title><![CDATA[Heading 2]]></Title>
<Content>
<p>Paragraph 2</p>
<p>Paragraph 3</p>
<h3>Heading 3</h3>
<p>Paragraph 4</p>
<p>Paragraph 5</p>
<p>Paragraph 6</p>
<h4>Heading 4</h4>
<p>Paragraph 7</p>
</Content>
</Block>
<Block>
<Title><![CDATA[Heading 2]]></Title>
<Content>
<p>Paragraph 8</p>
<p>Paragraph 9</p>
<p>
Paragraph
</p>
</Content>
</Block>
</Blocks>
So the grouping is done as far as I can tell, although the last p
in the second Block
does not appear in your required output but as your verbal description "All following text:p" does not suggest otherwise I have grouped following that description.
What is furthermore lacking is stuffing all those p
and hx
elements into a CDATA section, I am not sure you really want that, if so, I would suggest to grab something like http://lenzconsulting.com/xml-to-string/ or to use an extension function to serialize nodes to text. That might also need use of result tree fragments and use of exsl:node-set or similar to convert result tree fragments to node-sets for serializing. As an alternative you would need to change the templates for text:p
and others to output text nodes with markup instead of element nodes.