Schema.js

Schema.js

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This class handles schema validation, persistence, and modification.

Each individual Schema object should be immutable. The helpers to do things with the Schema just return a new schema when the schema is changed.

The canonical place to store this Schema is in the database itself, in a _SCHEMA collection. This is not the right way to do it for an open source framework, but it's backward compatible, so we're keeping it this way for now.

In API-handling code, you should only use the Schema class via the ExportAdapter. This will let us replace the schema logic for different databases.

TODO: hide all schema logic inside the database adapter.

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