A question for the rtexprvalue attribute of the tag

I'm using struts tag , and get some question for tag. In my jsp file. the code like this:
<html:hidden property="param1" value="<%=id%>otherwords"/>
note: I add some word after the express
when i run the jsp file, out of my thought, the result is :
<input type="hidden" name="param1" value="<%=id%>otherwords">I think the right result is:
I assign the id value is "2"
<input type="hidden" name="param1" value="2otherwords">but i erase the "otherwords" in the express, the result is right!!!
<input type="hidden" name="param1" value="2">not
<input type="hidden" name="param1" value="<%=id%>">What' the error?
Does the express must be closed in "<%=" and "%>"? Any titles mention it?
Many thanks.
Richard Jin

not sure why it wont work, but I think this will work
<html:hidden property="param1"><%=id%>otherwords</html:hidden>

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