Generating a string containing '

I don't seem to be able to create a string in OXML containing a single 
quote.

<o:param name="list" select="''one','two''/> obviously doesn't work, but 
there seems to be no means by which to escape the ' so that it will not 
cause the parser to do this:

org.oXML.xpath.parser.ParserException: invalid expression: null
	org.oXML.xpath.parser.GeneratedParser.report_fatal_error(GeneratedParser.java:661)
	java_cup.runtime.lr_parser.unrecovered_syntax_error(lr_parser.java:409)
	java_cup.runtime.lr_parser.parse(lr_parser.java:601)
	org.oXML.xpath.parser.GeneratedParser.parse(GeneratedParser.java:649)
	org.oXML.xpath.parser.ExpressionParser.parse(ExpressionParser.java:23)

It would be nice to be able to double the single quote:

<o:param name="list" select="'''one'',''two'''/>

Can the jcup grammar be changed? I'm not familiar enough with jcup to be 
able to do this myself.

Ken