Selecting node sets (attributes or elements) that match a string variable name

Consider this simple example of an XML element:

<parent foo="1" bar="2" foobar="3">
    <child/>
</parent>

      

        
        
        
      

    

In the xsl file, I ended up in the "parent" context (ie, inside the parent <template match = "gt"). I want to select a set of node (in the example, just one attribute) based on a string variable. For example, I want to select a node-set that matches $ attribute-name. I'll show my bad xsl example and you can probably figure out what I'm trying to do.

<xsl:template match="parent">
    <xsl:call-template name="print-value-of">
        <xsl:with-param name="attribute-type" select="'foo'"/>
    </xsl:call-template>
</xsl:template>

<xsl:template name="print-value-of">
    <xsl:param name="attribute-type"/>

    <xsl:value-of select="$attribute-type"/>
</xsl:template>

      

        
        
        
      

    

Will print the output:

foo

      

        
        
        
      

    

What I first ASSIGNED to do this (but I realize this is not what it should be doing):

1. evaluate an attribute type variable (or param if you want to be legible) as string 'foo'
2. call the value as if I were calling <xsl: value-select = "foo" / ">

those. i wanted it to print:

1

      

        
        
        
      

    

QUESTION . How can I achieve this behavior?

Notification . I know that in this simple case, I could have passed the actual node attribute as a parameter (eg <xsl: with-param name = "attribute" select = "foo" />). But this is not the solution I am looking for. I only need to pass information about the type of the attribute (or the name of the attribute if you prefer to call it)

What I am actually trying to do is create a generic function template that can:

1. Call a function (call pattern) with an attribute type as a parameter
2. A bunch of operations are done in a function which gives me a set of node stored in a variable
3. summarize all the attributes of the elements in the node set that are of the previously selected attribute type

<EDIT>
I can only use XSLT 1.0, so 1.0 is very preferred!
</EDIT>

<EDIT2>

Next question on a similar topic: Is it possible to also create a attributes with the name / type given by a string variable? I.e.

<xsl:attribute name="$attribute-type"/>

      

        
        
        
      

    

Doing it like the line above, the result in $ attribute-type is the literal name of the attribute in the xml output. Instead, I would like it to evaluate the variable again and give the evaluated value as a name.
</ EDIT2>