select="operand[(. < 50) and (. > 30)]" : select « XSLT stylesheet « XML Tutorial

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2. XSLT stylesheet
3. select

File: Data.xml

<math>
     <operand>12</operand>
     <operand>23</operand>
     <operand>45</operand>
     <operand>56</operand>
     <operand>75</operand>
</math>

File: Transform.xslt
<?xml version="1.0"?>
<xsl:stylesheet version="1.0"
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
  <xsl:output method="text" />

  <xsl:template match="math">
    <xsl:apply-templates
      select="operand[(. &lt; 50) and (. &gt; 30)]" />
  </xsl:template>
</xsl:stylesheet>

Output:

45