XSLT use value-of inside select (Nested value-of select) - xslt

Question

I am trying to pass the result of a value-of select to a parameter of another value-of select.
Here is the full code with pseudo statement (myVar)
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output omit-xml-declaration="yes" />
<xsl:variable name="data" select="document('user.xml')/user/data" />
<xsl:template match="/">
<xsl:for-each select="form/field">
<p class="field">
<xsl:attribute name="style">left:<xsl:value-of
select="left" />;top:<xsl:value-of select="top" />;
</xsl:attribute>
myVar = <xsl:value-of select="text" />
<xsl:value-of select="$data[#key = {#myVar}]/#value" />
</p>
</xsl:for-each>
</xsl:template>
</xsl:stylesheet>

Answer 1

I am trying to pass the result of a value-of select to a parameter of
another value-of select.
myVar = <xsl:value-of select="text" />
<xsl:value-of select="$data[#key = {#myVar}]/#value" />
The above line is syntactically incorrect -- select is the only attribute that doesn't accept AVT.
In order to achieve the wanted result replace the above with:
<xsl:value-of select="$data[#key = current()/text]/#value" />
Explanation: Proper use of the XSLT current() function.