Check if string exists in array of strings XSL

Is it possible to check if a string exists in an array of strings in XSL? I have the following XML:


<?xml version="1.0" encoding="UTF-8"?>
<ItemsArr>
  <it attr="DANCHO">
    <title>1</title>
  </it>
  <it attr="DAN">
    <title>2</title>
  </it>
  <it attr="IVANCHO">
    <title>3</title>
  </it>
  <it attr="DRAGANCHO">
    <title>4</title>
  </it>
  <it attr="PETKANCHO">
    <title>5</title>
  </it>
  <keys>
    <itemKey>DANCHO</itemKey>
    <itemKey>THISISONLYFORTESTING</itemKey>
  </keys>
</ItemsArr>

And the following XSL transformation:


<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://ift.tt/tCZ8VR">
<xsl:template match="/">
  <html>
  <body>
    <table border="1">
    <xsl:variable name="items" select="ItemsArr/keys/itemKey"/>

    <xsl:for-each select="/ItemsArr/it[contains($items,@attr)]">
     <tr>
        <td><xsl:value-of select="@attr"/></td>
        <td><xsl:value-of select="title"/></td>
      </tr>
    </xsl:for-each>
    </table>

  </body>
  </html>
</xsl:template>
</xsl:stylesheet>

I want to store all the keys (ItemsArr/Keys) in an array ($items) and then iterate over the it-s, which attr value exists in the $items array. Note that with the above data, both it are selected. If the two keys are swapped (DANCHO and THISISONLYFORTESTING) then nothing is selected.

Check if string exists in array of strings XSL

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