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Note You can t use <xsl:attribute> to add attributes to XSLT instructions remember you re adding
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attribute nodes to the result tree, not to the stylesheet.
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Any attributes that you add to an element with <xsl:attribute> instructions have to be added before you add any content to the element that you re generating, so usually <xsl:attribute> instructions come immediately after the start tag of the literal result element or the <xsl:element> instruction that creates the relevant element. You can use <xsl:attribute> to create some attributes, while adding others in the normal way at the same time. For example, the following creates an <img> element with width, height, src, and alt attributes.
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<img width="20" height="20"> <xsl:attribute name="src">favorite.gif</xsl:attribute> <xsl:attribute name="alt">[Favorite]</xsl:attribute> </img>
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Note If an attribute you generate using <xsl:attribute> has the same name as an attribute that s
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already on the literal result element, then the <xsl:attribute> instruction overrides the existing attribute.
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In this section, we ll look at how to use <xsl:attribute> for adding optional attributes, attributes with conditional values, and whole sets of attributes at once.
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Summary You can create attribute nodes using the <xsl:attribute> instruction, with the name of the
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attribute given in the name attribute and the value of the attribute specified by the content or the select attribute of the instruction.
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Creating Optional Attributes
When you add an attribute to a literal result element literally, you are forcing the attribute to be present. You can change the value of the literal attribute using an attribute value template, but you can t change whether it s there or not. On the other hand, because the <xsl:attribute> element is an instruction, you can put it within <xsl:if> or <xsl:choose> elements so that an attribute is only added in particular situations, or different attributes are added in different situations. The general patterns are <elementName> <xsl:if test="condition"> <xsl:attribute name="attributeName">attributeValue</xsl:attribute> </xsl:if> ... </elementName> and <elementName> <xsl:choose> <xsl:when test="condition1"> <xsl:attribute name="attributeName1">attributeValue1</xsl:attribute> </xsl:when> <xsl:when test="condition2"> <xsl:attribute name="attributeName2">attributeValue2</xsl:attribute> </xsl:when> ... <xsl:otherwise>
CHAPTER 8 RESULT TREES
<xsl:attribute name="defaultAttributeName"> <xsl:text>defaultAttributeValue</xsl:text> </xsl:attribute> </xsl:otherwise> </xsl:choose> </elementName>
Summary Wrapping <xsl:attribute> elements in <xsl:if> or <xsl:choose> allows you to control
which attributes get added to which elements.
Highlighting Interesting Programs (Again)
To illustrate how <xsl:attribute> is used to create optional attributes, we ll return to a scenario that we first discussed in 4: highlighting the interesting programs in our TV guide. The interesting programs are highlighted in the HTML using CSS if the <div> for the program has a class attribute with the value interesting, then the program is highlighted. In the solution that we re currently using in TVGuide6.xsl, we have separate templates that determine whether or not a class attribute is added to the <div> for a program, as follows: <xsl:template match="Program[@flag = ('favorite', 'interesting') or @rating > 6 or (some $n in (Series, Title, Description) satisfies contains(lower-case($n), 'news'))]"> <div class="interesting"> <xsl:apply-templates select="." mode="Details" /> </div> </xsl:template> <xsl:template match="Program"> <div> <xsl:apply-templates select="." mode="Details" /> </div> </xsl:template> The only difference between these templates is whether the <div> has a class attribute. The <div> elements have the same content and occur in the same place. So rather than repeating the same <div> and the same <xsl:apply-templates> to get the content of the <div>, we can use a single literal result element and add the class attribute conditionally, as in TVGuide7.xsl: <xsl:template match="Program"> <div> <xsl:if test="@flag = ('favorite', 'interesting') or @rating > 6 or (some $n in (Series, Title, Description) satisfies contains(lower-case($n), 'news'))">
CHAPTER 8 RESULT TREES
<xsl:attribute name="class" select="'interesting'" /> </xsl:if> <xsl:apply-templates select="." mode="Details" /> </div> </xsl:template> If you transform TVGuide.xml with TVGuide7.xsl to create TVGuide7.html, you ll see the interesting programs highlighted, exactly as they were before, as shown in Figure 8-12.
Figure 8-12. Viewing TVGuide7.html in Internet Explorer
The result of the transformation hasn t changed, but the clarity of the stylesheet has. We could even merge the Details mode template back into the main <Program> template again if we wanted.
Attribute Sets
Another aid to maintenance that is offered by XSLT is the ability to define sets of attributes, which you can then apply to elements in different places within your stylesheet. You can define an attribute set using the <xsl:attribute-set> element, which lives at the top level of your stylesheet as a direct child of the <xsl:stylesheet> document element. Each <xsl:attribute-set> element has a name attribute, which specifies the name of the attribute set so that you can refer to it later. Within the <xsl:attribute-set> element, you use <xsl:attribute> instructions to define the attributes in the set. For example, the following defines an attribute set called image, which contains the two attributes width and height:
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