Materializing properties is the process to derive a value from a property path (like Property A->Property B->Property C)  and store it as a property of a document instance.

To materialize properties of a doctype specify the property paths as a comma separated list. Only documents stored after the definition of the space properties will have the materialized properties. Existing documents need to be stored or reindexed again.

The last part of the space identifier is the identifier of the doctype whose properties are to be materialized.