xml generation with a quotation mark in the attribute

[SuniX]

hello,
imagine the line :
<example attributname="attributvalue"/>
i want to insert a quotation mark into the attribute value :
<example attributname="attrib"utvalue"/>
i've tried this &#34;:
<example attributname="attrib&#34;utvalue"/>
and it seems to work
but i dont know what to do if a user enter &#34; for value, i don't know 
 how to convert it

So is there an object which convert a String into another which can be 
inserted in an xml attribute value ?

thanks