mErrorString.Append(NS_LITERAL_STRING(" at line "));
mErrorString.AppendLiteral(" at line ");
txDriver::createErrorString(){    XML_Error errCode = XML_GetErrorCode(mExpatParser);    mErrorString.AppendWithConversion(XML_ErrorString(errCode));    mErrorString.Append(NS_LITERAL_STRING(" at line "));    mErrorString.AppendInt(XML_GetCurrentLineNumber(mExpatParser));    mErrorString.Append(NS_LITERAL_STRING(" in "));    mErrorString.Append((const PRUnichar*)XML_GetBase(mExpatParser));}