Here is my XSL file that does not work,
   <xsl:template match="Obj">
       <xsl:variable name="objName" select="@name"/>
       <xsl:variable name="caseString" select =
"$doc2//obj[@name = $objName]/@cases"/>
        <xsl:variable name="caseArray"
select="tokenize($caseString, ',')"/>

<xsl:for-each select="$caseArray">

<xsl:apply-templates />

And you are not in any node tree, so there is no
way to push any nodes at your stylesheet.  Your
current context item is a string value.

!0XTTE0510: Cannot apply-templates to child nodes when
the context item is an atomic value!1.

If you wanted to push the node children of Obj
then put Obj into a variable and use:

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