The AddMetaSchemaExtensions method is called immediately after SetToolParameters. This method should be used to add any metaschema extensions that are specific to the application.
Essentially there are two types of extensions the application metadata adapter might wish to add:
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Extensions for application-specific metadata properties and application-specific property types (these should be added from within AddMetaSchemaExtensions)
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Extensions for semantics to be called by the transaction manager based on user actions (these should be added from within SetTransactionManager)