Open Data Protocol

In computing, Open Data Protocol (OData) is an open protocol that allows the creation and consumption of queryable and interoperable Web service APIs in a standard way. Microsoft initiated OData in 2007. Versions 1.0, 2.0, and 3.0 are released under the Microsoft Open Specification Promise. Version 4.0 was standardized at OASIS, with a release in March 2014. In April 2015 OASIS submitted OData v4 and OData JSON Format v4 to ISO/IEC JTC 1 for approval as an international standard. In December 2016¹, ISO/IEC published OData 4.0 Core as ISO/IEC 20802-1:2016 and the OData JSON Format as ISO/IEC 20802-2:2016. The protocol enables the creation and consumption of HTTP-based Web APIs, which allow Web clients to publish and edit resources, identified using URLs and defined in a data model, using simple HTTP messages. OData shares some similarities with JDBC and with ODBC; like ODBC, OData is not limited to relational databases.

In computing, Open Data Protocol (OData) is an open protocol that allows the creation and consumption of queryable and interoperable Web service APIs in a standard way. Microsoft initiated OData in 2007. Versions 1.0, 2.0, and 3.0 are released under the Microsoft Open Specification Promise. Version 4.0 was standardized at OASIS, with a release in March 2014. In April 2015 OASIS submitted OData v4 and OData JSON Format v4 to ISO/IEC JTC 1 for approval as an international standard. In December 2016, ISO/IEC published OData 4.0 Core as ISO/IEC 20802-1:2016 and the OData JSON Format as ISO/IEC 20802-2:2016. The protocol enables the creation and consumption of HTTP-based Web APIs, which allow Web clients to publish and edit resources, identified using URLs and defined in a data model, using simple HTTP messages. OData shares some similarities with JDBC and with ODBC; like ODBC, OData is not limited to relational databases. ==Standardization== After initial development by Microsoft, OData became a standardized protocol of the OASIS OData Technical Committee (TC). ===OASIS OData Technical Committee=== "The OASIS OData TC works to simplify the querying and sharing of data across disparate applications and multiple stakeholders for re-use in the enterprise, Cloud, and mobile devices. A REST-based protocol, OData builds on HTTP, AtomPub, and JSON using URIs to address and access data feed resources. It enables information to be accessed from a variety of sources including (but not limited to) relational databases, file systems, content management systems, and traditional Web sites. OData provides a way to break down data silos and increase the shared value of data by creating an ecosystem in which data consumers can interoperate with data producers in a way that is far more powerful than currently possible, enabling more applications to make sense of a broader set of data. Every producer and consumer of data that participates in this ecosystem increases its overall value." TC participants include CA Technologies, Citrix Systems, IBM, Microsoft, Progress Software, Red Hat, SAP SE and SDL. ==Architecture== OData is a protocol for the creation and consumption of Web APIs. OData thus builds on HTTP, AtomPub, and JSON using URIs to address and access data feed resources. ===Resource identification=== OData uses URIs to identify resources. For every OData service whose service root is abbreviated as http://host/service/, the following fixed resources can be found: Query options can be appended to a URL after a ? character and are separated by & characters; each option consists of a $ -sign prefixed name and its value, separated by a = sign, for example: OData/Products?$top=2&$orderby=Name . A number of logical operators and functions are defined for use when filtering data, for example: OData/Products?$filter=Price lt 10.00 and startswith(Name,'M') requests products with a price smaller than 10 and a name starting with the letter 'M'. { "@odata.context": "http://services.odata.org/V4/OData/OData.svc/$metadata#Products", "value": [ { "ID": 0, "Name": "Meat", "Description": "Red Meat", "ReleaseDate": "1992-01-01T00:00:00Z", "DiscontinuedDate": null, "Rating": 14, "Price": 2.5 }, { "ID": 1, "Name": "Milk", "Description": "Low fat milk", "ReleaseDate": "1995-10-01T00:00:00Z", "DiscontinuedDate": null, "Rating": 3, "Price": 3.5 }, ... ] } http://services.odata.org/v4/odata/odata.svc/Products Products 2015-05-19T03:38:50Z http://services.odata.org/V4/OData/OData.svc/Products(0) 2015-05-19T03:38:50Z 0 Bread Whole grain bread 1992-01-01T00:00:00Z 4 2.5 http://services.odata.org/V4/OData/OData.svc/Products(1) 2015-05-19T03:38:50Z 1 Milk Low fat milk 1995-10-01T00:00:00Z 3 3.5 ... ==References== ==External links== Official website Develop Service-Oriented Applications with WCF OData Basics Presentation

Text derived from https://en.wikipedia.org/w/index.php?oldid=1338038069 under CC BY-SA 4.0; modifications have been made.