How to transform XML?

Hi all,
As i am very new at this technology, maybe my question is very easy for you, but i need advice very much!
Hi, the point is that i generate some XML files using DBMS_XMLGenXML library, but that XML files are not very correct because the character ' ( for example: avión) is not well written.
So, I think i need to transform my XML, and the problem is that i don't know how to do it,
¿should i make and XSLT file, and use that file with DBMS_XMLGen.setStylesheetHeader?
or can i use and XSD file, and ¿ how can i use an XSD file to transform?
as you can see i am very new, but trying hard to learn a lot!
thx all!

( for example: avión) is not well written.Why not? What output do you get?
Seems to work fine in general:
SQL> select dbms_xmlgen.getxmltype('select ''avión'' e from dual') e from dual
E
<ROWSET>
<ROW>
<E>avión</E>
</ROW>
</ROWSET>
1 row selected.

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