# Schema processing

The product build structure has been changed to generate two products, Saxon-B and Saxon-SA. Saxon-B is the open source product; Saxon-SA contains additional functionality to support schema processing. The basic hooks to plug in schema processing were already present in Saxon 7.9.1. The code in Saxon-B is all present in identical form in Saxon-SA; Saxon-SA does not change the basic open source code, it adds extra components.

The code for reading and analysing schemas was originally derived from similar code in Castor. It has been almost totally rewritten and greatly enhanced, though parts of the original design remain intact. The run-time validation code (to validate instance documents against a schema) is completely new.

For further information see Schema Processing.

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