Encoding invalid XML characters

[Tom Sugden]

Hello,

Can anybody suggest the best approach for encoding invalid XML characters
into an XML document? For example, the Unicode character with the
hexadecimal code 000C can be encoded into a Java character literal as
follows:

    char c = '\u000C';

I tried encoding this character into an XML string using a standard
character reference. For example:

    String s = "<tag>&#x000C;</tag>";

However, when attempting to parse this into a DOM Document using Xerces, the
following exception is raised:

   org.xml.sax.SAXParseException: Character reference "&#x000C" is an
invalid XML character.
   ...
   at org.apache.xerces.util.ErrorHandlerWrapper.fatalError(Unknown Source)

In case anybody is curious about why I want to perform such an encoding,
I'll briefly explain. Some databases allow these characters in text fields.
I have a web service that performs a database query and encodes the results
into XML for delivery in a SOAP response. If the database query produces a
result set containing illegal XML characters, they still need to be encoded
into the SOAP response in some way.

Thanks in advance for any suggestions.

Cheers,
Tom


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