2. VS2005 will automatically format xml, auto complete the input and even can debug xslt
3. <xsl:text disable-output-escaping="yes"> </xsl:text>
4. <xsl:if test="middle"> checks for the existence of a node set rather than for
a boolean value. If any <middle> elements are found, the content of <xsl:if> is instantiated.
Checking for the existence of an attribute is very similar to checking for the existence of an
element. For example:
<xsl:if test="@someAttribute">
...execute this code if "someAttribute" is present
</xsl:if>
Inside XSLT
1. XSL = XSLT+XPath+XSL-FO
2. Root node and root element
The root node of an XSLT tree represents the entire document. It is not the same as the root element. For example, take a look at the following document; in XSLT terms, the root node represents the whole document, and the root element is <library>:
<?xml version="1.0"?>
<library>
<book>
<title>
Earthquakes for Lunch
</title>
<title>
Volcanoes for Dinner
</title>
</book>
</library>
3. "/" Matches the root node
"*" Matches element nodes (not all nodes, which is a common mistake to make)
"PLANET" Matches <PLANET> elements
"PLANET/MASS" Matches all <MASS> elements that are children of a <PLANET> element
"//PLANET" Matches all <PLANET> elements descending from the root node
"." Matches the current node
4. Using <xsl:apply-templates/> alone simply makes the XSLT processor search for all templates that match the child nodes of the context node, and that's the default usage. However, sometimes that's not good enough, because you may want to apply templates in a specific order, or otherwise choose what templates to apply, and you do that with the select attribute of the <xsl:apply-templates/>.5. To refer to an attribute value using XPath, you preface the attribute name with @ like this: "@src", "@height", "@width", and so on. To match any attribute, you can use the expression "@*".
6. By default, <xsl:text> elements escape characters that could be part of markup. For example, <xsl:text>Here is a greater-than sign:></xsl:text> gets written as "Here is a greater-than sign: >," not "Here is a greater-than sign: >." You can use <xsl:text> when you want characters such as < and & to appear in your output document, rather than < and &. To do that, set the <xsl:text> element's disable-output-escaping attribute to "yes" (the default is "no").
such as:
<td class="valueJobHistoryDevice" width="20%">
<xsl:value-of select="Barcode"></xsl:value-of>
<xsl:if test="string-length(Barcode/text())=0">
<xsl:text disable-output-escaping="yes"> </xsl:text>
</xsl:if>
</td>
7. The <xsl:copy> element enables you to copy a node from the source tree to the output tree. Note that this is a shallow copy, however, which does not copy any of the node's descendents or attributes. This element has one attribute:
use-attribute-sets . Specifies the names of attribute sets to be applied to a created element. Set to a whitespace-separated list of QNames. You can use the attribute only when the context node is an element;
However, there's an easier way of making sure that you copy all the children, attributes, and other descendents of nodes: You can use <xsl:copy-of> rather than <xsl:copy>.The <xsl:copy-of> element enables you to make a deep copy of nodes, which means that not just the node, but all attributes and descendents are copied as well. This element has one attribute:
select (mandatory). The node or node set you want copied.
8. You also can use the * character as a wildcard, standing for any element. (* can match only elements, although note that the pattern @* can match any attribute.) For example, the following rule applies to all <NAME> elements that are grandchildren of <PLANET> elements:<xsl:template match="PLANET/*/NAME">
<H3>
<xsl:value-of select="."/>
</H3>
</xsl:template>
In a pattern, the node node test matches any node except the root node
XSLT Example
1. Local variable overrides global variable
<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="Test.xslt"?>
<source>
<chapter>Chapter A</chapter>
<chapter>Chapter B</chapter>
<chapter>Chapter C</chapter>
<chapter>Chapter D</chapter>
</source>
<xsl:stylesheet version = '1.0'
xmlns:xsl='http://www.w3.org/1999/XSL/Transform'>
<xsl:variable name="text">Chapter</xsl:variable>
<xsl:template match="/">
<TABLE>
<xsl:for-each select="//chapter">
<TR>
<TD>
<xsl:variable name="text">
<xsl:choose>
<xsl:when test="position() = 1">First chapter</xsl:when>
<xsl:when test="position()=last()">Last chapter</xsl:when>
<xsl:otherwise>
<xsl:value-of select="$text"/>
</xsl:otherwise>
</xsl:choose>
</xsl:variable>
<xsl:value-of select="$text"/>
<xsl:text> : </xsl:text>
<xsl:value-of select="."/>
</TD>
</TR>
</xsl:for-each>
</TABLE>
</xsl:template>
</xsl:stylesheet>
2. The use of for-each and test
<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="Test.xslt"?>
<source>
<number>1</number>
<number>3</number>
<number>4</number>
<number>17</number>
<number>8</number>
</source>
<xsl:stylesheet version = '1.0'
xmlns:xsl='http://www.w3.org/1999/XSL/Transform'>
<xsl:template match="/">
<TABLE>
<xsl:for-each select="//number">
<TR>
<TD>
<xsl:if test=".>=3">
<xsl:value-of select="name()"/>
<xsl:text> </xsl:text>
<xsl:value-of select="."/>
</xsl:if>
<xsl:if test=".>=1">
<xsl:value-of select="name()"/>
<xsl:text> </xsl:text>
<xsl:value-of select="."/>
</xsl:if>
</TD>
</TR>
</xsl:for-each>
</TABLE>
</xsl:template>
</xsl:stylesheet>
3. Test constains muliti-conditions
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="html" />
<xsl:template match="/">
<html>
<body>
<h1>XPath Examples</h1>
Presidents elected between 1800 and 1850 were:
<ul>
<xsl:if test="presidents/president[(term/@from > 1800 ) and (term/@from < 1850)]">
<xsl:value-of select="count(presidents/president[(term/@from > 1800 ) and (term/@from < 1850)])"></xsl:value-of>
<xsl:apply-templates select="presidents/president[(term/@from > 1800 ) and (term/@from < 1850)]/name"/>
</xsl:if>
</ul>
</body>
</html>
</xsl:template>
<xsl:template match="name">
<li>
<xsl:value-of select="first"/>
<xsl:text> </xsl:text>
<xsl:value-of select="middle"/>
<xsl:text> </xsl:text>
<xsl:value-of select="last"/>
</li>
</xsl:template>
</xsl:stylesheet>
4. xsl:choose example:
<xsl:template match="presidents">
<h3>Color Coded by Political Party</h3>
<ul>
<xsl:for-each select="president">
<xsl:variable name="color">
<!-- define the color value based on political party -->
<xsl:choose>
<xsl:when test="party = 'Democratic'">
<xsl:text>blue</xsl:text>
</xsl:when>
<xsl:when test="party = 'Republican'">
<xsl:text>green</xsl:text>
</xsl:when>
<xsl:when test="party = 'Democratic Republican'">
<xsl:text>purple</xsl:text>
</xsl:when>
<xsl:when test="party = 'Federalist'">
<xsl:text>brown</xsl:text>
</xsl:when>
<xsl:when test="party = 'Whig'">
<xsl:text>black</xsl:text>
</xsl:when>
<!-- never executed in this example -->
<xsl:otherwise>
<xsl:text>red</xsl:text>
</xsl:otherwise>
</xsl:choose>
</xsl:variable>
<li>
<font color="{$color}">
<!-- show the party name -->
<xsl:apply-templates select="name"/>
<xsl:text> - </xsl:text>
<xsl:value-of select="party"/>
</font>
</li>
</xsl:for-each>
</ul>
5. call-emplate and param example:
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="html"/>
<xsl:template match="/">
<html>
<body>
<h3>Team Members</h3>
<ul>
<xsl:for-each select="team/manager|team/programmer">
<xsl:sort select="name"/>
<li>
<xsl:value-of select="name"/>
<xsl:text>, ssn = </xsl:text>
<xsl:call-template name="formatSSN">
<xsl:with-param name="ssn" select="@ssn"/>
</xsl:call-template>
</li>
</xsl:for-each>
</ul>
</body>
</html>
</xsl:template>
<!-- a named template that formats a 9 digit SSN
by inserting '-' characters -->
<xsl:template name="formatSSN">
<xsl:param name="ssn"/>
<xsl:value-of select="substring($ssn, 1, 3)"/>
<xsl:text>-</xsl:text>
<xsl:value-of select="substring($ssn, 4, 2)"/>
<xsl:text>-</xsl:text>
<xsl:value-of select="substring($ssn, 6)"/>
</xsl:template>
</xsl:stylesheet>
6. The identity Transformation:
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" version="1.0" encoding="UTF-8" indent="yes"/>
<xsl:template match="@*|node( )">
<xsl:copy>
<xsl:apply-templates select="@*|node( )"/>
</xsl:copy>
</xsl:template>
</xsl:stylesheet>
And maybe
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" indent="yes"/>
<!-- processing begins here -->
<xsl:template match="/">
<xsl:copy-of select="."></xsl:copy-of>
</xsl:template>
</xsl:stylesheet>
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