The GEO Discovery and Access Broker ( DAB ) is a middleware component which is in charge of interconnecting the heterogeneous and distributed capacities contributing to GEOSS; it became part of the GEOSS Common Infrastructure (GCI) since November 2011. The DAB provides three main functionalities:

1. Discovery of resources from brokered sources
2. Semantics-enriched discovery
3. Access of resources

Since it is a middleware component, DAB users are typically software agents, such as web-based or desktop client applications. These can exploit the DAB functionalities implementing the client-side of one (or more) of the protocols published by the DAB for the above functionalities. The available protocols include:

• OGC Catalog Service for the Web (CSW)
• OpenSearch with geo, time and semantic extensions
• Open Archive Initiative (OAI) PMH
• OGC Web Processing Service
• etc

In order to simplify the development of applications and clients making use of the DAB, we have developed the following APIs:

JavaScript API

RESTful API

Support

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