>  anyone can tell me how can I generate an apostrophe character

this is a FAQ

To get an apostrophe in a string you need to use " to delimit the
string so you just need the Xpath expression "'"

To get the three characters "'" into an XML attribute is a question
about XML not XPath or XSLT, there are several ways, for example either
of the following:

select=""'""
select='"'"'

David

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