The aim of this project is to gather together the
IVOA schemata so that they can be referred to as local
files - which in turn can have benefits to software that wants to use a schema
to validate an instance or generate other artifacts offline.
The importance of local schema access is show by https://www.owasp.org/index.php/XML_External_Entity_(XXE)_Prevention_Cheat_Sheet
Warning - The schemata in the project should not be considered definitive if they differ from those at the official source http://www.ivoa.net/xml/