[xsl] Copy Attribute Unless

[Alan <alan-xsl-list@xxxxxxxxx>]

    This is a coding style question.

    My document looks like this:

    <xfixture>
      <bench>
        <fixture class="com.agtrz.test.StringReverse">
          <control-point name="input"
                         class="java.lang.String"/>
          <control-point name="output"
                         trim="true"
                         class="java.lang.String"/>
        </fixture>
        <test>
          <control name="input">Hello</control>
          <control name="output" trim="false">olleH</control>
        </test>
      </bench>
    </xfixture>

    I'm using this document to generate JUnit tests.

    I run the document through two XSLT _2.0_ transforms. The first
    one "expands" the document, which makes it easier to write a
    transform that generates Java code. 

    When I expand, I want to copy properties from the control
    definiton, into the test control value, unless they have been
    overridden by the 

    <xfixture>
      <bench>
        <fixture class="com.agtrz.test.StringReverse">
          <control-point name="input"
                         class="java.lang.String"/>
          <control-point name="output"
                         class="java.lang.String"/>
        </fixture>
        <test>
          <control class="java.lang.String" name="input">Hello</control>
          <control trim="false"
                   class="java.lang.String" name="output">olleH</control>
        </test>
      </bench>
    </xfixture>

    In my expand.xslt I have a template like so...

    <xsl:template match="control">
      <xsl:variable name="definition"
                    select="ancestor::bench/fixture/control-point[
                                          @name = current()/@name]"/>
      <xsl:copy>
        <xsl:copy-of select="@*"/>
        <xsl:if test="not(@trim)">
          <xsl:copy-of select="$defition/@trim"/>
        </xsl:if>
        <xsl:if test="not(@class)">
          <xsl:copy-of select="$defition/@class"/>
        </xsl:if>
        <!--| Repeat for every attribute I add. |-->
      </xsl:copy>

    </xsl:template>

    My question... Is there a clever select statement that could
    "copy all the attributes, and all the definition attributes,
    unless they are already definied in the test instance."

--
Alan Gutierrez - alan@xxxxxxxxx