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You can avoid having to define two attribute sets that perform the same function by pushing the logic into templates:
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="html"/>
<xsl:attribute-set name="gain-loss-font">
<xsl:attribute name="color">
<xsl:apply-templates select="." mode="gain-loss-font-color"/>
</xsl:attribute>
</xsl:attribute-set>
<xsl:template match="stock" mode="gain-loss-font-color">
<xsl:choose>
<xsl:when test="(current - paid) * qty >= 0">black</xsl:when>
<xsl:otherwise>red</xsl:otherwise>
</xsl:choose>
</xsl:template>
<xsl:template match="property" mode="gain-loss-font-color">
<xsl:choose>
<xsl:when test="appriasal - paid >= 0">black</xsl:when>
<xsl:otherwise>red</xsl:otherwise>
</xsl:choose>
</xsl:template>
...
</xsl:stylesheet>
You might be uncomfortable incorporating any purely stylistic attributes such as colors, fonts, and the like into your XSLT transformation. Perhaps it is not your job—but the job of a company style czar—to decide how to render gains and losses. In this case, you can simply classify the elements and defer stylizing decisions to a separately defined stylesheet:
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="html"/>
<xsl:attribute-set name="gain-loss">
<xsl:attribute name="class">
<xsl:apply-templates select="." mode="gain-loss"/>
</xsl:attribute>
</xsl:attribute-set>
<xsl:template match="stock" mode="gain-loss">
<xsl:choose>
<xsl:when test="(current - paid) * qty >= 0">gain</xsl:when>
<xsl:otherwise>loss</xsl:otherwise>
</xsl:choose>
</xsl:template>
<xsl:template match="property" mode="gain-loss">
<xsl:choose>
<xsl:when test="appriasal - paid >= 0">gain</xsl:when>
<xsl:otherwise>loss</xsl:otherwise>
</xsl:choose>
</xsl:template>
<xsl:template match="portfolio">
<html>
<head>
<title>My Portfolio</title>
<link rel="stylesheet" type="text/css" href="portfolio.css"/>
</head>
...
</xsl:template>
<xsl:template match="stock">
<tr>
<td><xsl:value-of select="symbol"/></td>
<td align="right"><xsl:value-of select="current"/></td>
<td align="right"><xsl:value-of select="paid"/></td>
<td align="right"><xsl:value-of select="qty"/></td>
<td align="right" xsl:use-attribute-sets="gain-loss">
<xsl:value-of
select="format-number((current - paid) * qty, '#,##0.00')"/>
</td>
</tr>
</xsl:template>
<xsl:template match="property">
<tr>
<td><xsl:value-of select="address"/></td>
<td align="right"><xsl:value-of select="paid"/></td>
<td align="right"><xsl:value-of select="appriasal"/></td>
<td align="right" xsl:use-attribute-sets="gain-loss">
<xsl:value-of
select="format-number(appriasal - paid, '#,##0.00')"/>
</td>
</tr>
</xsl:template>
</xsl:stylesheet>
The style czar can then decide how to render <td class="gain"> and <td class="loss"> by using portfolio.css, as shown in Example 8-1.
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Created: March 27 2003
Revised: May 5, 2003
URL: http://webreference.com/programming/xslt/cookbook/chap8/2
