APOSTROPHE in select="..."

Hi, anyone can tell me how can I generate an apostrophe character (') inside an
xsl select expression; e.g.:

<xsl:with-param name="foo" select="'''" /> <!-- this is bad!!! -->

Yes, I know!! I can write:
<xsl:with-param name="foo"><xsl:text>'</xsl:text></xsl:with-param>
but I ask myself If a solution does exist!!
I tried with:
* select="'''"
* select="'&apos;'"
* select="'&#x27'"
* select="'"
* select="&apos"
* select="&#x27"
but all are wrongs!!!
Any idea??
Thank you in advance!!

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