The Dataspace Protocol is a set of specifications designed to facilitate interoperable data sharing between entities governed by usage control and based on Web technologies. These specifications define the schemas and protocols required for entities to publish data, negotiate Agreements, and access data in a data space
The JSON schema file at https://github.com/International-Data-Spaces-Association/ids-specification/blob/main/catalog/message/schema/catalog-schema.json only contains a few attributes. Full DCAT compliance requires also the missing ones. Same for the Shape file.