Apache Marmotta is a

linked data In computing, linked data (often capitalized as Linked Data) is structured data which is interlinked with other data so it becomes more useful through semantic queries. It builds upon standard Web technologies such as HTTP, RDF and URIs, but r ...

platform that comprises several

components Circuit Component may refer to: •Are devices that perform functions when they are connected in a circuit. In engineering, science, and technology Generic systems * System components, an entity with discrete structure, such as an assem ...

. In its most basic configuration it is a

Linked Data In computing, linked data (often capitalized as Linked Data) is structured data which is interlinked with other data so it becomes more useful through semantic queries. It builds upon standard Web technologies such as HTTP, RDF and URIs, but r ...

server. Marmotta is one of the reference projects early implementing the new

Linked Data Platform Linked Data Platform (LDP) is a linked data specification defining a set of integration patterns for building RESTful HTTP services that are capable of read/write of RDF data. The Linked Data Platform allows use of RESTful HTTP to consume, create ...

recommendation that is being developed by

W3C The World Wide Web Consortium (W3C) is the main international standards organization for the World Wide Web. Founded in 1994 and led by Tim Berners-Lee, the consortium is made up of member organizations that maintain full-time staff working to ...

. It has been contributed by Salzburg Research from the Linked Media Framework, and continues its versioning, hence starting at version 3.0.0. Since April 2013, it is listed among the Semantic Web tools by the

. In November 2020, it was retired to the Apache Attic, meaning that the project is no longer being developed.

Components

The project is split in several parts: the platform itself, which includes full Read Write

SPARQL SPARQL (pronounced "sparkle" , a recursive acronym for SPARQL Protocol and RDF Query Language) is an RDF query language—that is, a semantic query language for databases—able to retrieve and manipulate data stored in Resource Description F ...

, LDP, Reasoning, and basic security. In addition to the platform, the project develops some libraries can also be used separately: * KiWi, a

Triplestore A triplestore or RDF store is a purpose-built database for the storage and retrieval of triples through semantic queries. A triple is a data entity composed of subject–predicate–object, like "Bob is 35" or "Bob knows Fred". Much like a relati ...

built on top of a

relational database A relational database is a (most commonly digital) database based on the relational model of data, as proposed by E. F. Codd in 1970. A system used to maintain relational databases is a relational database management system (RDBMS). Many relatio ...

. * LDPath, a path language to navigate across

resources. * LDClient, a Linked Data client that allows retrieval of remote resources via different protocols by making use of pluggable adapters (data providers) that wrap other data sources (such as

YouTube YouTube is a global online video platform, online video sharing and social media, social media platform headquartered in San Bruno, California. It was launched on February 14, 2005, by Steve Chen, Chad Hurley, and Jawed Karim. It is owned by ...

and

Facebook Facebook is an online social media and social networking service owned by American company Meta Platforms. Founded in 2004 by Mark Zuckerberg with fellow Harvard College students and roommates Eduardo Saverin, Andrew McCollum, Dustin M ...

). * LDCache, a

cache Cache, caching, or caché may refer to: Places United States * Cache, Idaho, an unincorporated community * Cache, Illinois, an unincorporated community * Cache, Oklahoma, a city in Comanche County * Cache, Utah, Cache County, Utah * Cache Count ...

system that automatically retrieves resources by internally using LDClient.

History

Linked Media Framework (''pre-Apache'')

Apache Marmotta is the continuation of the open source Linked Media Framework published in early 2012.

Apache Marmotta

* On November 16, 2012 it is proposed to the

Apache Software Foundation The Apache Software Foundation (ASF) is an American nonprofit corporation (classified as a 501(c)(3) organization in the United States) to support a number of open source software projects. The ASF was formed from a group of developers of the A ...

under the name of Apache Linda, later changed to Apache Marmotta in order to avoid confusion with the Linda language. * On 3 December 2012 Marmotta enters incubation. * On April 26, 2013 Marmotta 3.0.0-incubating is released. * On October 3, 2013 Marmotta 3.1.0-incubating is released. * In November 2013, it graduated as top-level project. * In April 2014, the project released its first actual release under the umbrella of the Apache Software Foundation: 3.2.0 version. * On 5 December 2014, the project published the version 3.3.0.

Notable users

* The backend of

Salzburger Nachrichten The ''Salzburger Nachrichten'' is a German language daily newspaper published in Salzburg, Austria. It has been in circulation since 1945. History and profile ''Salzburger Nachrichten'' was established in 1945 by the American forces occupying Au ...

's search and archive is powered by Marmotta. *

Enel Enel S.p.A. is an Italian Multinational corporation, multinational manufacturer and distributor of electricity and gas. Enel, which originally stood for Ente nazionale per l'energia elettrica (National Electricity Board), was first established ...

uses Marmotta for its Open Data portal. * The

cloud In meteorology, a cloud is an aerosol consisting of a visible mass of miniature liquid droplets, frozen crystals, or other particles suspended in the atmosphere of a planetary body or similar space. Water or various other chemicals may co ...

infrastructure of Redlink is powered by Marmotta. * It is being used by some European research projects such as Fusepool and MICO (''Media in Context''). *

Digital Public Library of America The Digital Public Library of America (DPLA) is a US project aimed at providing public access to digital holdings in order to create a large-scale public digital library. It officially launched on April 18, 2013, after two and a half years of dev ...

uses Marmotta to run LDP server and RDF repository. * WordLift uses Marmotta as Linked Data backend.

Bibliography

* * * * * * *

References

External links

*
Marmotta Incubation Proposal

Apache Marmotta presentation

Apache Marmotta on the W3C
{{Apache Software Foundation Marmotta Cross-platform software Free software programmed in Java (programming language) Semantic Web Triplestores