This project does not seem to have an XML schema published, nor do the examples have a DOCTYPE or xmlns to identify which schema is to be used to validate them. The README also misstates what this is: ...

A Model Context Protocol (MCP) server that exposes OpenAPI schema information to Large Language Models (LLMs) like Claude. This server allows an LLM to explore and understand OpenAPI specifications ...

Introducing the Data Vending Machine, schema caching in Structural, strengthened synthesis in Textual, + Object and Array generators in Fabricate!