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It provides facilities for: The OData Protocol is different from other REST-based web service approaches in that it provides a uniform way to describe both the data and the data model.This improves semantic interoperability between systems and allows an ecosystem to emerge.
This document defines version 3.0 of the OData Specification.A typical OData interaction proceeds as follows: In this way, the service always remains in control.It defines what is allowed at any moment and how that will be requested.See Requesting Data and Data Modification for details.The key words “MUST”, “MUST NOT”, “REQUIRED”, “SHALL”, “SHALL NOT”, “SHOULD”, “SHOULD NOT”, “RECOMMENDED”, “MAY”, and “OPTIONAL” in this document are to be interpreted as described in RFC2119, “Key words for use in RFCs to Indicate Requirement Levels”)].are defined in metadata as individual value terms with a name and a type.
Value annotations are typically used to specify an individual fact about an element, such as whether it is read-only.
OData allows generic clients to discover the capabilities of services.
This is possible because the service is defined in a uniform way, using a comon data model.
Towards that end, the OData Protocol follows these design principles: : the abstract data model that MUST be used to describe the data exposed by an OData service.
An OData Metadata Document is a representation of a service’s data model exposed for client consumption.
A set of related type annotation terms or value annotation terms in a common namespace comprises a .