XSDError

XSDError is a generic error category that arises during validation or processing of XML Schema Definition (XSD) files. The term is used by several XML parsing libraries and development environments to indicate a problem that occurs when the schema definition itself is syntactically or semantically incorrect. Common causes include missing or mismatched elements, attributes that violate constraints, or incompatible type definitions. When an XSD parser encounters such a problem it typically raises an XSDError exception or returns a validation error object containing details about the location and nature of the failure.

In many programming languages, XSDError is implemented as a subclass of a more general ValidationError or Exception type. For example, in the Python lxml library the error is represented by an etree.XMLSchemaError, whereas in Java's standard XML Validation API the error might be reported via a SAXParseException wrapped in a ValidatorException. Developers can catch XSDError to provide informative diagnostics, log detailed error reports, or automatically correct minor issues in the schema when building tooling or generating code from XSD files.

The term also appears in documentation for programming frameworks that auto‑generate data models from XML schemas, such as JAXB in Java. In these contexts XSDError conveys that the input schema is invalid and must not be used to build data-binding code. Consequently, resolving XSDError typically involves examining the reported line numbers and messages, editing the XSD file to conform to the renaming rules and hierarchical constraints defined by the W3C XML Schema specification, and re‑validating.