XSD Tester

This XSD tester validates XML instances against XML Schema Definitions (XSD) to ensure conformance to data types, constraints, and namespaces. It accepts an XSD input and optional XML instance; it parses the schema, compiles type definitions, and validates the instance. When an XML input is provided, the tool reports syntax errors, type violations, missing elements, and constraint failures with line/column references. If XML is omitted, it can generate minimal test instances based on required elements to verify schema structure. Core features include support for XSD 1.0 and 1.1 (where available), multiple namespaces, simple type derivations, and global/local element resolution. The tool also outlines expected element types, occurrence constraints (minOccurs/maxOccurs), and union/intersection rules. It offers deterministic error messages and suggested fixes, helping developers iterate quickly. The output is structured for integration with CI pipelines and can be exported as JSON or XML reports. Beneficiaries include API developers, data integrators, and QA engineers who validate payloads, validate contract compliance, and debug schema issues. Unique value arises from precise diagnostics, support for common schema constructs, and the ability to validate complex type hierarchies without writing custom validators. Use cases include validating request/response payloads in XML-based APIs, data migration validation, and schema conformance checks during schema evolution. Core features and use cases are described below: schema compilation, instance validation, error reporting, namespace handling, optional test instance generation, and exportable reports.