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XML spec defines a subset of Unicode characters which are allowed in XML documents:
http://www.w3.org/TR/REC-xml/#charsets.
How do I filter out these characters from a String in Java?
simple test case:
Assert.equals("", filterIllegalXML(""+Character.valueOf((char) 2)))
It’s not trivial to find out all the invalid chars for XML. You need to call or reimplement the XMLChar.isInvalid() from Xerces,
http://kickjava.com/src/org/apache/xerces/util/XMLChar.java.htm