XSLT String Comparison

How can I compare strings to create a table with XSLT?

I have an xml like this:

<Os>
        <O type="xyz">
            <Count>126</Count>
            <Food>Yes</Food>
            <Owner name="Jack">
                <Phone>564815</Phone>
            </Owner>
            <Date>12/12/2014</Date>
        </O>
        <O type="zyx">
            <Count>56</Count>
            <Food>No</Food>
            <Owner name="Phill">
                <Phone>826633</Phone>
            </Owner>
            <Date>09/11/2015</Date>
        </O>
</Os

And I want to traverse in it with for each and add a row if food='yes'.

  <xsl:for-each select="Organizasyonlar/Organizasyon">
  <xsl:sort select="KişiSayısı" data-type="number" />
  <tr>
    <td><xsl:value-of select="@type"/></td>
    <td><xsl:value-of select="Count"/></td>
    <td><xsl:value-of select="Food"/></td>
    <td><xsl:value-of select="Owner/@name"/></td>
    <td><xsl:value-of select="Owner/Phone"/></td>
    <td><xsl:value-of select="Date"/></td>
  </tr>
  </xsl:for-each>

I think I can do it if I say food:1 when there is food and food:0 when there is not. And then I can write an if statement food>0 but I don't want to do that.

Thanks in advance.