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
The term also appears in documentation for programming frameworks that auto‑generate data models from XML schemas,