barcode generator github c# Tip Because the default namespace declaration is on the <xsl:stylesheet> element, the default in Font

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Tip Because the default namespace declaration is on the <xsl:stylesheet> element, the default
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namespace is in scope for the entire stylesheet. This way, it doesn t matter in which template the elements are generated; if you don t use a prefix, they will be in the XHTML namespace. If you put the default namespace declaration on the <html> element within the template, on the other hand, it will only be in scope within that element in the template itself, and only the literal result elements in that template will be in the XHTML namespace. Therefore, I always declare all the namespaces that I want to use in an XSLT stylesheet on the <xsl:stylesheet> element.
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Similarly, if we wanted to, we could add a namespace declaration for another namespace, for example MathML, to the <xsl:stylesheet> element: <xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xdt="http://www.w3.org/2005/04/xpath-datatypes" xmlns="http://www.w3.org/1999/xhtml" xmlns:math="http://www.w3.org/1998/Math/MathML"> ...
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With that namespace declaration in place, you can use the math prefix on any literal result element, and it will be associated with the MathML namespace.
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Note MathML is a markup language for mathematical expressions, developed by the W3C. You can find
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out more about MathML at http://www.w3.org/Math/.
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Summary The namespace of an element in the result tree is the same as the namespace of the literal
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result element that generates it.
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Generating Elements in the XHTML Namespace
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Our stylesheet is supposed to generate XHTML, so the elements that we create with it should be in the XHTML namespace (http://www.w3.org/1999/xhtml). The literal result elements that we re using in the stylesheet don t use a prefix, so we can just add a default namespace declaration to the <xsl:stylesheet> document element to place the generated elements in the XHTML namespace: <xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xdt="http://www.w3.org/2005/04/xpath-datatypes" xmlns="http://www.w3.org/1999/xhtml"> ... </xsl:stylesheet> When you do this, the XSLT processor adds a default namespace declaration to the <html> element that it generates. Take a look at the source of TVGuide3.html, which is the result of transforming TVGuide.xml with TVGuide3.xsl. You should see a namespace declaration for the XHTML namespace in the start tag of the <html> element: <html xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xdt="http://www.w3.org/2005/04/xpath-datatypes" xmlns="http://www.w3.org/1999/xhtml"> <head> ... </head> <body> ... </body> </html> None of the other elements in the output have a namespace declaration on them because the XSLT processor knows that the namespace declaration it s put on the <html> element remains in scope for the rest of the document. As you can see, there are also extra namespace declarations for the XML Schema and XPath datatypes namespaces. To get rid of them, we need to use the exclude-result-prefixes attribute on the <xsl:stylesheet> element,
CHAPTER 8 RESULT TREES
<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xdt="http://www.w3.org/2005/04/xpath-datatypes" exclude-result-prefixes="xs xdt" xmlns="http://www.w3.org/1999/xhtml"> ... </xsl:stylesheet> This change has been made in TVGuide4.xsl; look at TVGuide4.html, which is the result of transforming TVGuide.xml with TVGuide4.xsl, and you ll see that the unwanted namespace declarations have been removed: <html xmlns="http://www.w3.org/1999/xhtml"> <head> ... </head> <body> ... </body> </html> Now try removing the default namespace declaration from the <xsl:stylesheet> element and putting it on the <html> element where it s generated within the template matching the root node instead, as in TVGuide5.xsl: <xsl:template match="/"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> ... </head> <body> <h1>TV Guide</h1> <xsl:apply-templates /> </body> </html> </xsl:template> Transform TVGuide.xml with TVGuide5.xsl and take a look at TVGuide5.html, the result. The only literal result elements for which the default namespace declaration is in scope are those within the preceding template. Elements created in other templates are still in no namespace. The output looks like this: <html xmlns="http://www.w3.org/1999/xhtml"> <head> ... </head> <body> <h1>TV Guide</h1> <p xmlns=""><a href="#BBC1">BBC1</a>...</p>
CHAPTER 8 RESULT TREES
<h2 xmlns="" class="channel"><a name="BBC1" id="BBC1">BBC1</a></h2> <div xmlns="" class="nowShowing">...</div> ... </body> </html> Because the elements that aren t generated in the template matching the root node are in no namespace, the XSLT processor has to add namespace declarations that reset the default namespace back to no namespace on those elements.
Namespaces for Elements Generated with <xsl:element> When you use <xsl:element> to create an element, the name attribute specifies the name of the element that you generate. The name attribute is treated in exactly the same way as the name of a literal result element if you specify a prefix in the name attribute, then that prefix is resolved according to the namespace declarations in the stylesheet, to tell the XSLT processor to which namespace the element should be assigned; if you don t specify a prefix in the name attribute, then the processor uses the default namespace, if there is one. For example, if the prefix math is associated with the MathML namespace within the stylesheet, then the following generates a <matrix> element in the MathML namespace (usually with the prefix math): <xsl:element name="math:matrix"> ... </xsl:element>
Note Technically, XSLT processors are allowed to use whatever prefix they like for the elements that they
generate, as long as that prefix is associated with the correct namespace in the result document. In practice, processors use the prefix that you provide for the namespace, though if you declare a namespace twice with different prefixes, it might choose either of the prefixes you provided.
Summary Including a prefix on the name specified by the <xsl:element> instruction places the generated element in the associated namespace.
Dynamic Element Namespaces Since the name attribute of <xsl:element> is an attribute value template, you can use {}s to set the name of the element that you create dynamically. This goes for the prefix that you use for the element (and hence its namespace) as well. For example, the following sets the local name of the generated element to the value of the $name variable, and assigns it to the namespace associated with the prefix that s the value of the $prefix variable:
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