barcodewriter zxing c# INTERPRETING RSS WITH XSLT in Font

Maker PDF417 in Font INTERPRETING RSS WITH XSLT

CHAPTER 17 INTERPRETING RSS WITH XSLT
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And the BBC1.xml document that we ll be generating from this is shown in Listing 17-5. Listing 17-5. BBC1.xml <Channel> <Name>BBC1</Name> <Program videoPlus="620"> <Start>2001-07-05T19:00:00</Start> <Duration>PT30M</Duration> <Series>A Question of Sport</Series> <Title/> <Description> Sports quiz hosted by Sue Barker. </Description> </Program> <Program videoPlus="2571" rating="5"> <Start>2001-07-05T19:30:00</Start> <Duration>PT30M</Duration> <Series>EastEnders</Series> <Title/> <Description> Mark's health scare forces him to reconsider his future with Lisa, while Jamie is torn between Sonia and Zoe. </Description> </Program> ... </Channel> The stylesheet that we ll construct for this task is RSS2Channel.xsl. This stylesheet will exercise a lot of the XSLT and XPath that you ve learned over the course of this book, so hold tight!
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Basic Stylesheet
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Before we launch into the body of the stylesheet, we need to set up the basics look at the namespaces that we need to be able to handle, consider what whitespace management we want to use, and decide what control we want over the output.
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Managing Namespaces
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RSS documents use a lot of namespaces, especially if the extra modules are used as well. The namespaces that are used in the source documents are The RDF namespace http://www.w3.org/1999/02/22-rdf-syntax-ns# The RSS namespace http://purl.org/rss/1.0/ The Dublin Core namespace http://purl.org/dc/elements/1.1/ The Syndication namespace http://purl.org/rss/modules/syndication/ The TV Review namespace http://www.example.com/reviews
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CHAPTER 17 INTERPRETING RSS WITH XSLT
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All except the Syndication namespace are used for elements or attributes that we re interested in, so our stylesheet needs to declare these namespaces, as well as the XSLT namespace, within the <xsl:stylesheet> element as follows: <xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:rss="http://purl.org/rss/1.0/" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:rev="http://www.example.com/reviews"> ... </xsl:stylesheet> In addition, we re going to need the namespaces for the XML Schema datatypes and the XPath datatypes, so we need to include their namespaces as well: <xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:rss="http://purl.org/rss/1.0/" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:rev="http://www.example.com/reviews" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xdt="http://www.w3.org/2003/05/xpath-datatypes"> ... </xsl:stylesheet> On the other hand, the result of the transformation doesn t involve any namespaces. If we leave the <xsl:stylesheet> element as shown, then any elements that we construct within the stylesheet will be given namespace nodes for each of these namespaces, with the end result that the output of the transformation will include namespace declarations for the RDF, RSS, Dublin Core, TV Review, XML Schema, and XPath datatypes namespaces, despite the fact that they are never used within the document itself. To prevent this from happening, we can use the exclude-result-prefixes attribute on <xsl:stylesheet>, listing the prefixes of the namespaces that we don t want to be included in the result. The <xsl:stylesheet> element therefore looks like the following: <xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:rss="http://purl.org/rss/1.0/" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:rev="http://www.example.com/reviews" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xdt="http://www.w3.org/2003/05/xpath-datatypes" exclude-result-prefixes="rdf rss dc rev xs xdt"> ... </xsl:stylesheet>
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CHAPTER 17 INTERPRETING RSS WITH XSLT
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Managing Whitespace
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Our next preparatory task is to decide what to do about whitespace-only text nodes in the source RSS documents. If we can strip out the whitespace-only text nodes that we re not interested in, we ll end up with a much smaller tree and run less risk of numbering going awry (if we ever add it) because we have whitespace that we don t want in the result document. Fortunately, in general RDF documents tend to avoid mixed content, so you can usually strip whitespace-only text nodes throughout the document. This is true in the case of the RSS documents that we re dealing with, so we can use <xsl:strip-space> to strip all whitespace-only text nodes from the two source documents, as follows: <xsl:strip-space elements="*" />
Managing Output
The final setup task for the stylesheet is to construct an <xsl:output> element that describes the format that we want to generate. In this case, we re generating a basic XML format, with no special media type, no DTD, and no elements that should contain CDATA sections. Therefore the <xsl:output> element is pretty simple the only things that I think we should include are instructions to the processor to indent the output and to use the ISO-8859-1 encoding, as that will make it easier for us to read and debug in standard text editors: <xsl:output indent="yes" encoding="ISO-8859-1" />
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