Parse processing instructions in XSLT

Question

I have following XML.

<sec xmlns:xlink="http://www.w3.org/1999/xlink" id="fm2" sec-type="other">
  <title />
  <?SAE page="ii"?>
  <p><bold>Other SAE books of interest:</bold></p>
  <p><bold>Electric and Hybrid-Electric Vehicles</bold></p>
  <p>Edited by Ronald K. Jurgen</p>
  <p>(Product Code: PT-143.SET)</p>
  <p><bold>Diesel Emissions and Their Control</bold></p>
  <p>By Magdi K. Khair and W. Addy Majewski</p>
  <p>(Product Code: R-303)</p>
  <p><bold>Hybrid Powered Vehicles, Second Edition</bold></p>
  <p>By John M. German</p>
  <p>(Product Code: T-125)</p>
  <p>For more information or to order a book, contact SAE International at</p>
  <p>400 Commonwealth Drive, Warrendale, PA 15096-0001, USA;</p>
  <p>phone 877-606-7323 (U.S. and Canada only) or 724-776-4970 (outside U.S. and Canada);</p>
  <p>fax 724-776-0790;</p>
  <p>email <email>CustomerService@sae.org</email>;</p>
  <p>website <uri xlink:href="http://books.sae.org">http://books.sae.org</uri>.</p>
</sec>

I have to create XSLT for it. I am doing it in this way:

<xsl:for-each select="book-front/sec">
  <xsl:value-of select="title"/>
  <xsl:value-of select="p"/>
</xsl:for-each>    

But it is not parsing anything.

The main problem is parsing <?SAE page="ii"?> It is not allowing its further attributes to parse. I don't know how to parse it and then what will be its corresponding XSLT.

My xml is

<sec id="ch1.4">
<label><bold>1.4</bold></label>
<title><bold>Energy Consumption of Commercial Vehicles</bold></title>
<p>Commercial vehicle manufacturing and operation is a major source of energy consumption globally. In 2009, the United States consumed 23&#x0025; of the global petroleum production &#x005B;<xref ref-type="bibr" rid="R3">1.3</xref>&#x005D;. According to the U.S. Department of Energy, 72&#x0025; <?SAE page="8"?>of the U.S. petroleum consumption is for transportation. Commercial vehicles consumed up to 18.7&#x0025; of the total energy consumption in transportation in the United States. In other words, commercial vehicles in the United States alone consumed over 3&#x0025; of the global petroleum production in 2009 &#x005B;<xref ref-type="bibr" rid="R3">1.3</xref>, <xref ref-type="bibr" rid="R34">1.34</xref>&#x005D;.</p></sec>

after applying ur code, i got

Commercial vehicle manufacturing and operation is a major source of energy consumption globally. In 2009, the United States consumed 23% of the global petroleum production [ 

But i want

**Energy Consumption of Commercial Vehicles**
Commercial vehicle manufacturing and operation is a major source of energy consumption globally. In 2009, the United States consumed 23% of the global petroleum production [1.3 ]. According to the U.S. Department of Energy, 72%Page 8 of the U.S. petroleum consumption is for transportation. Commercial vehicles consumed up to 18.7% of the total energy consumption in transportation in the United States. In other words, commercial vehicles in the United States alone consumed over 3% of the global petroleum production in 2009 [

Now explain how to get this output ?? I hope my problem is more understandable to you now.

Answer 1

You can use

<xsl:template match="processing-instruction('SAE')">
  <xsl:value-of select="." />
</xsl:template>

to match processing instructions named SAE. (And <xsl:apply-templates select="processing-instruction('SAE')" />, naturally)

The value of the instruction is not really XML, even if it looks like regular attributes in this case.

Processing instructions really only contain plain text, because they might be anything - from simple bits of information to complete programs in languages other than XSLT.

You can only get the content of the instruction, in your case the string 'page="ii"', which you then must parse manually.

You could do it in XPath like this:

<xsl:template match="processing-instruction('SAE')">
  <xsl:variable name="start-token">page="</xsl:variable>
  <xsl:variable name="end-token">"</xsl:variable>
  <xsl:variable name="temp" select="substring-after(., $start-token)" />

  <xsl:value-of select="substring-before($temp, $end-token)" />
  <!-- output: "ii" -->
</xsl:template>

Answer 2

If you want to simple copy the whole content, just do the following:

<xsl:template match="node()|@*">
    <xsl:copy>
        <xsl:apply-templates select="node()|@*"/>
    </xsl:copy>
</xsl:template>

this is called an identity template. Afterwards, create template matches to override the copied nodes. In case of xref, you can try.

<xsl:template match="xref">
    <a href="{@rid}">
        <xsl:apply-templates/>
    </a>
</xsl:template>