XMLUTF8Transcoder::transcodeTo  fails with an exception when transcoding single 
characters that require 3 or more bytes as UTF8.
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                 Key: XERCESC-1947
                 URL: https://issues.apache.org/jira/browse/XERCESC-1947
             Project: Xerces-C++
          Issue Type: Bug
    Affects Versions: 3.1.0, 3.1.1
         Environment: Tested on mac os and debian linux. The failure is only 
manifest on v3.1.x
            Reporter: Ben Griffin
            Priority: Critical


This can be demonstrated with the following 2 lines of code.

        const XMLCh uval [] = { 0x254B, 0x0000}; //BOX DRAWINGS HEAVY VERTICAL 
AND HORIZONTAL (needs 3 bytes for utf-8)
        char* uc = (char*)TranscodeToStr(uval,"UTF-8").adopt(); cout << uc << 
endl << flush; XMLString::release(&uc); //faulty exception;

The error is: "terminate called after throwing an instance of 
'xercesc_3_1::TranscodingException'"

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