Flat HTML headers to nested XML sections

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  • CrazyAtlantaGuy

    #1

    Flat HTML headers to nested XML sections

    I am working on creating an XSLT that transforms Html into an XML
    format that can be imported into Framemaker. The challenge, it turns
    out, is correctly transforming the flat html header tags (<H1>, <H2>,
    etc)
    into nested sections inside the xml. I have made significant
    progress, but have run into a roadblock.

    Here is an example of my input HTML:

    <html><body>
    <p>abc abc</p>
    <h1 class='header'> A</h1>
    <p>A abc abc</p>
    <h2 class='header'> B</h2>
    <p>B abc abc</p>
    <h3 class='header'> C</h3>
    <p>Cabc abc</p>
    <h2 class='header'> D</h2<!-- this is missing in the output --
    >
    <p>D abc abc</p<!-- this is missing in the output -->
    <h1 class='header'> E</h1>
    <p>E abc abc</p>
    </body></html>

    Here is an example of the output, you'll notice that the <H2>D</h2>
    is missing.

    <?xml version="1.0" encoding="UTF-8"?>
    <article>
    <title/>
    <para>abc abc</para>
    <section depth="1" id="A">
    <title>A</title>
    <para>A abc abc</para>
    <section depth="2" id="B">
    <title>B</title>
    <para>B abc abc</para>
    <section depth="3" id="C">
    <title>C</title>
    <para>C abc abc</para>
    </section>
    </section>
    </section>
    <section depth="1" id="E">
    <title>E</title>
    <para>E abc abc</para>
    </section>

    The problem is that my code is currently applying templates to all
    nodes following a header who's nearest preceding header is that same
    header. For this reason when content follows a header which isn't
    it's header (like an <h2following an <h3>) it doesn't get shown.
    What I don't understand is how to fix it. Any help would much
    appreciated. I'm not really an xsl guru, so I'm doing the best I can
    to get through this.

    Here is the relevant code from my xsl:

    <xsl:template match="body">
    <article>
    <title>
    <xsl:value-of select="$docTit le" />
    </title>

    <xsl:for-each select='child:: *[not(preceding-
    sibling::*[@class="header"])][not(@class="hea der")]'>
    <xsl:apply-templates select="."/>
    </xsl:for-each>

    <xsl:variable name='depth'
    select='substri ng(name(child:: *[@class="header"][1]),2)'/>
    <xsl:for-each select='child:: *[@class="header"]
    [substring(name( ),
    2)&lt;=$depth]'>
    <xsl:apply-templates select="."/>
    </xsl:for-each>

    </article>
    </xsl:template>

    <xsl:template match="h1 | h2 | h3 | h4 | h5">
    <xsl:call-template name="header">
    <xsl:with-param name="depth" select="substri ng(name(),2)"/>
    </xsl:call-template>
    </xsl:template>

    <xsl:template name="header">
    <xsl:param name="depth"/>
    <section>
    <xsl:attribut e name="depth">
    <xsl:value-of select="$depth"/>
    </xsl:attribute>

    <xsl:attribut e name="id">
    <xsl:value-of select="transla te(.,' ','')" />
    </xsl:attribute>
    <title><xsl:val ue-of select="."/></title>

    <xsl:variable name='thisHeade r' select='generat e-id(.)'/>
    <xsl:for-each select='followi ng-sibling::*[$thisHeader=gen erate-
    id(preceding-sibling::*[@class="header"][last()])]
    [not(@class="hea der") or (@class="header " and substring(name( ),2)>=
    $depth)]'>
    <xsl:apply-templates select="."/>
    </xsl:for-each>

    </section>

    </xsl:template>

  • Peter Flynn

    #2
    Re: Flat HTML headers to nested XML sections

    CrazyAtlantaGuy wrote:
    I am working on creating an XSLT that transforms Html into an XML
    format that can be imported into Framemaker. The challenge, it turns
    out, is correctly transforming the flat html header tags (<H1>, <H2>,
    etc) into nested sections inside the xml.
    This is called encapsulation, and there's a much neater way than writing
    XSLT to try and reach-forward-down-the-tree-up-to-but-not-including the
    next H1/H2/H3/etc.

    1. Run Tidy to make the HTML into well-formed XHTML (tidy -nc -asxml)

    2. Write a short script to turn the XHTML back into valid SGML
    (remove NETs, namespaces)

    3. Apply a DocType Declaration for the ISO 15445 HTML DTD, which
    includes a DIV1/DIV2 containment structure, in "preparatio n" mode
    (declare % Preparation as INCLUDE in the internal subset and use
    pre-html as the declared root element type)

    4. Run osgmlnorm to normalize the document: this adds the missing
    markup, switches single quotes to double where possible, etc

    <!doctype pre-html
    public "ISO/IEC 15445:2000//DTD HyperText Markup Language//EN" [
    <!entity % Preparation "include" >
    ]>
    <PRE-HTML>
    <HEAD>
    <META CONTENT="HTML Tidy for Linux/x86 (vers 1 September 2005), see
    www.w3.org" NAME="GENERATOR ">
    <TITLE></TITLE>
    </HEAD>
    <BODY>
    <P>abc abc</P>
    <H1 CLASS="header"> A</H1>
    <DIV1>
    <P>A abc abc</P>
    <H2 CLASS="header"> B</H2>
    <DIV2>
    <P>B abc abc</P>
    <H3 CLASS="header"> C</H3>
    <DIV3>
    <P>Cabc abc</P>
    </DIV3>
    </DIV2>
    <H2 CLASS="header"> D</H2>
    <DIV2>
    <P>D abc abc</P>
    </DIV2>
    </DIV1>
    <H1 CLASS="header"> E</H1>
    <DIV1>
    <P>E abc abc</P>
    </DIV1>
    </BODY>
    </PRE-HTML>

    You can easily mess with the Preparation structure in the DTD if you
    don't like the way they did it (I don't).

    ///Peter

    Comment

    • Joe Kesselman

      #3
      Re: Flat HTML headers to nested XML sections

      You could try adapting something from the XSLT FAQ. Likely candidates
      would be

      or


      Some of the other examples on that page may also be adaptable to this
      question.

      (It's always worth checking Dave's page; he has done an excellent job of
      collecting useful answers from XSL-List, which is unofficial but has
      been in existence since before XSL was a Recommendation and has had
      participation by a lot of XSL's architects and implementers. I still try
      to keep half an eye on that list, though I must admit I don't watch it
      as closely as I should.)

      --
      () ASCII Ribbon Campaign | Joe Kesselman
      /\ Stamp out HTML e-mail! | System architexture and kinetic poetry

      Comment

      • CrazyAtlantaGuy

        #4
        Re: Flat HTML headers to nested XML sections

        On May 17, 12:37 am, Joe Kesselman <keshlam-nos...@comcast. netwrote:
        You could try adapting something from the XSLT FAQ. Likely candidates
        would behttp://www.dpawson.co. uk/xsl/sect2/N4486.html#d589 1e424
        orhttp://www.dpawson.co. uk/xsl/sect2/N4486.html#d589 1e1051
        >
        Some of the other examples on that page may also be adaptable to this
        question.
        >
        (It's always worth checking Dave's page; he has done an excellent job of
        collecting useful answers from XSL-List, which is unofficial but has
        been in existence since before XSL was a Recommendation and has had
        participation by a lot of XSL's architects and implementers. I still try
        to keep half an eye on that list, though I must admit I don't watch it
        as closely as I should.)
        >
        --
        () ASCII Ribbon Campaign | Joe Kesselman
        /\ Stamp out HTML e-mail! | System architexture and kinetic poetry
        Thanks for the help!

        Comment

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