| The XML Schema API operations only raise exceptions in "exceptional"
circumstances, i.e., when an operation is impossible to perform (either
for logical reasons, because data is lost, or because the implementation
has become unstable).
Implementations should raise other exceptions under other circumstances.
Some languages and object systems do not support the concept of
exceptions. For such systems, error conditions may be indicated using
native error reporting mechanisms. For some bindings, for example,
methods may return error codes similar to those listed in the
corresponding method descriptions.
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