Finding if an attribute has a specific value

mphare · February 2nd, 2009, 06:51 PM

I'm using Saxon 9b

I have an XML file produced by a separate application. The structure was defined by someone besides me and I cannot change it.

I have a root node that has 0 or more 'payload-block' elements somewhere inside it. Each payload-block has an attribute ('@block) that takes on a value from 1 to 5. The child element is of type name-def-param and it also has an attribute (@name) that takes on a string name (letters, number)

What I want to do if find if there are any specific name-def-param elements with a specified @name value.

So.. I tried this:

Code:

    <xsl:template match="name-def-param" mode="doNew">
        <xsl:param name="inputMsg1"/>
        <xsl:param name="block"/>

        <xsl:variable name="name" select="upper-case(@name)"/>
        <xsl:variable name="posi" select="@posi"/>
            <xsl:if
                test="empty($inputMsg1//payload-block[@block-id='$block']/name-def-param[upper-case(@name) = $name])">

                <xsl:text>&#x0a;</xsl:text>
                <xsl:text>Named Block: </xsl:text>
                <xsl:value-of select="$block"></xsl:value-of>
                <xsl:text>&#x0a;</xsl:text>

                <xsl:text>New Attribute: </xsl:text>
                <xsl:value-of select="$name"/>
                <xsl:text>&#x0a;</xsl:text>
            </xsl:if>
    </xsl:template>

If the target values is not in the source tree, then it's marked as a 'New' item.

The problem is I'm getting false hits. Even if the value is present in the target, this is still telling me it cannot find it.

Am I misunderstanding how empty() works?

I've also tried counting the instances with count($inputMsg1//payload-block[@block-id='$block']/name-def-param[upper-case(@name) = $name]) = 0 in the test. And it's no better.

mphare · February 2nd, 2009, 06:57 PM

No.. I don't understand how attribute comparisons work.. apparently..

The single quotes around the [@block-id = '$block'] statement were throwing everything off. Removing the quotes seems to have fixed it.

Thanks!