Conditional variable assignment

The root node of my document has a style attribute which serves as the
default for the entire XML document. Nested subordinate elements MAY have an
attribute that overrides the document default as shown in the snipet below.

<root_element default_style="style1">
    <child>
        <grandchild style_override="style5"/>
    </child>
</root>

As you might guess the logic of my XSLT says if the grandchild has an
override use its value otherwise use the default. Once I know which value
to use I need to construct an <xsl:choose> to know what to do next.

I created a top-level  (global) variable to capture the default style so it
will be available when I instantiate the grand child node
<xsl:variable name="default_style" select="root_element/@default_style />

Now I THINK I would like to create ONE variable to use in the xsl:choose
construct.....BUT I can't quite get it right.
CONCEPTUALLY I want to say:

<xsl:variable name="style"
    <xsl:if test="@style_override">
            style = @style_override
   </xsl:if>
    <xsl:if test="not(@style_override)">
            style =$default_style
   </xsl:if>

<!-- Now with the variable "style" set -->
    <xsl:choose>
        <xsl:when text="$style=style1">
                ....call template1....
     </xsl:when>
    <xsl:when text="$style=style2">
                ....call template2....
     </xsl:when>

 Any help would be greatly appreciated....Thanks


"You already have zero privacy -- get over it !!
Melvyn Rosengarden
melrose@xxxxxxxxxxxxxxxx


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