Error Messages
Error messages can be sent on three different levels.
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Errors in StringMessage
Errors on the outer level include cases like unavailable operators or invalid content. They are not version-specific.
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Errors in Content/Payload
Errors related to valid requests might be handled "inline" in the matching response if the operator is able to create a response, otherwise an ErrorResponse may be used (<GeneralErrorType> in StringError.xsd).
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Errors in Responses
The response types have their own error fields for informational messages and non-fatal errors. See the documentation of the queries by category.
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Standard Error Messages
STRING defines a set of standard error messages and matching codes. They are not stored in the XSD schemata but on the STRING web server: http://string.drv.de/message/errors_$LANG.csv. We will supply at least English and German versions of these files; other languages might follow later.
