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[xsl] Is split problem a grouping problem?

2018-02-01 15:05:25
Hi, I am trying to solve a problem using XSLT 2. Here is my input:

<?xml version="1.0" encoding="UTF-8"?>
<book>
    <chapter>
        <title>Chapter 1</title>
        <section>
            <title>Section 1.1</title>
        </section>
        <section>
            <title>Section 1.2</title>
        </section>
        <section>
            <title>Section 1.3</title>
            <section>
                <title>Section 1.3.1</title>
            </section>
            <section>
                <title>Section 1.3.2</title>
            </section>
            <section>
                <title>Section 1.3.3</title>
            </section>
            <section>
                <title>Section 1.3.4</title>
                <intro/>
                <section>
                    <title>Section 1.3.4.1</title>
                </section>
                <section>
                    <title>Section 1.3.4.2</title>
                </section>
                <section>
                    <title>Section 1.3.4.3</title>
                </section>
            </section>
        </section>
    </chapter>
    <chapter>
        <title>Chapter 2</title>
        <section>
            <title>Section 2.1</title>
            <section>
                <title>Section 2.1.1</title>
            </section>
            <section>
                <title>Section 2.1.2</title>
                <intro/>
                <section>
                    <title>Section 2.1.2.1</title>
                </section>
                <section>
                    <title>Section 2.1.2.2</title>
                </section>
                <section>
                    <title>Section 2.1.2.3</title>
                </section>
            </section>
        </section>
        <section>
            <title>Section 2.2</title>
        </section>
    </chapter>
</book>

I want to split this content up into separate files (eventually HTML). Here
is the desired output:

<?xml version="1.0" encoding="UTF-8"?>
<book>
    <file>
        <title>Chapter 1</title>
        <section>
            <title>Section 1.1</title>
        </section>
    </file>
    <file>
        <title>Section 1.2</title>
    </file>
    <file>
        <title>Section 1.3</title>
        <section>
            <title>Section 1.3.1</title>
        </section>
    </file>
    <file>
        <title>Section 1.3.2</title>
    </file>
    <file>
        <title>Section 1.3.3</title>
    </file>
    <file>
        <!-- Doesn't have to be with the following child section because it
has <intro/> content. -->
        <title>Section 1.3.4</title>
        <intro/>
    </file>
    <file>
        <title>Section 1.3.4.1</title>
    </file>
    <file>
        <title>Section 1.3.4.2</title>
    </file>
    <file>
        <title>Section 1.3.4.3</title>
    </file>
    <file>
        <!-- All have to stay together because there is no content between
the <title/> and child <section/> -->
        <title>Chapter 2</title>
        <section>
            <title>Section 2.1</title>
            <section>
                <title>Section 2.1.1</title>
            </section>
        </section>
    </file>
    <file>
        <title>Section 2.1.2</title>
        <intro/>
    </file>
    <file>
        <title>Section 2.1.2.1</title>
    </file>
    <file>
        <title>Section 2.1.2.2</title>
    </file>
    <file>
        <title>Section 2.1.2.3</title>
    </file>
    <file>
        <title>Section 2.2</title>
    </file>
</book>

The rules are as follows: A <section> can be in its own file if

1) There are no child <section> elements (like Section 1.2).
2) There is element content after the <title> and before the first child
<section> element; for example an <intro> element (like Section 1.3.4).

Otherwise, the <section> has to contain any first child descendants (like
Chapter 2 through Section 2.1.1).

This looks to me like a grouping problem where I can use
<xsl:for-each-group>. I have this as a shell but I want to make sure I am on
the right track. Thank you very much.

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
    xmlns:xs="http://www.w3.org/2001/XMLSchema";
    exclude-result-prefixes="xs"
    version="2.0">
    
    <xsl:template match="/">
        <xsl:for-each-group group-starting-with="//chapter|//section"
select=".">
            <file>
                <xsl:copy-of select="current-group()"/>
            </file>
        </xsl:for-each-group>
    </xsl:template>
</xsl:stylesheet>

Rick
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