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From Rob Vesse <>
Subject Re: [PROPOSAL] OData Proposal for Incubator
Date Mon, 17 Jun 2013 16:59:37 GMT

What overlap (if any) do you see with the existing Marmotta podling?

They are building out an implementation of the Linked Data Platform which
is a ongoing W3C standardization effort
( and can be thought of as a
more RDF/Semantic Web centric alternative to the MS/Oasis OData standard.


On 6/17/13 8:35 AM, "Klevenz, Stephan" <> wrote:

>Dear ASF members,
>We would like to propose the OData project to the Incubator.
>The OData Proposal is available at:
>We welcome your feedback and suggestions.
>Stephan Klevenz
>= Apache OData =
>=== Abstract ===
>Apache OData is a generic Java language implementation of the OData 2.0
>specification which will serve as a code base for the upcoming OASIS
>OData specification.
>=== Proposal ===
>The Open Data Protocol (OData) [1] is a Web protocol for querying and
>updating data that provides a way to unlock your data and free it from
>silos that exist in applications today. OData does this by applying and
>building upon Web technologies such as HTTP, Atom Publishing Protocol
>(AtomPub) and JSON to provide access to information from a variety of
>applications, services, and stores.
>The Apache OData is a library which enables developers to implement OData
>producers and OData consumers. Basic principles of the library are to
>provide an OData 2.0 specification compliant OData Library, enhancements
>shall be possible in a compatible manner, have a clear separation between
>Core and API, to provide an option to build extensions on top. This
>library should be base for implementing future releases of the
>=== Background ===
>OData was originally developed by Microsoft and is released in a version
>2.0 under an Open Specification Promise [2]. A lot of companies did show
>interests in this protocol, used it in products and gave feedback back to
>Microsoft. This joined effort resulted in a new release OData 3.0 in
>2012, this version became the basis for the OASIS technical committee [3]
>which is currently working on a new version of the specification. This
>OASIS standard release is expected this year.
>The initial Java code of this project was developed by a development team
>that had already experience with other OData 2.0 and 3.0 implementations
>at SAP AG. The current code base implements OData 2.0 and because of this
>version is widely used it is a good starting point to build an open
>source community for the OData standard.
>The current code also comes up with an implementation of an OData sample
>service. On the one side this is an example for users which want to use
>the library to expose their own data and on the other side it illustrates
>how implemented features work.
>Additionally, the code base includes an extension which is called JPA
>processor. With this extension it is easy to expose any JPA persistence
>model via OData protocol without a lot of coding.
>=== Rationale ===
>More software vendors moving to OData means more choice for customers who
>will be able to use different implementations. For the standard to
>succeed, however, ensuring interoperability is paramount: in order to
>manage an ever growing context and leverage the enormous portability and
>interoperability issues that a globally adopted standard brings, it is
>necessary to think about how to make the related ecosystem healthy and
>sustainable. Successful modern standards are driven by:
> * Clear documentation, built iteratively with continuous feedback from
> * A clearly defined compatibility process, enforced by tools that allow
>to gauge how implementations can be compatible and interoperable
> * Accurate compliance criteria, documented in writing as well as in
>actual testing code that measure how tools and libraries are able to
> * A sample implementation to clear up potential doubts and ensure that
>the standard can actually be implemented in real life scenarios
>The above mentioned pieces are able to make the development activity,
>towards an OData implementation, easier and more successful. Having an
>healthy ecosystem will ensure a smoother implementation process, more
>compliant products, and ultimately, a wider adoption of the standard.
>The OData ecosystem has been successful in creating and documenting early
>versions of the standard, yet it might potentially lack two very
>important aspects, that is a exhaustive implementation of the complete
>protocol that can be used productively and to ensure interoperability. As
>much as such artifacts can be developed independently by any OData
>proponent, the value of having a neutral party as a steward of actual
>code is to be considered. The Apache Software Foundation has been playing
>this kind of role for many years, and can provide the perfect environment
>to foster contributions on the OData theme with a great amount of
>=== Initial Goals ===
> * Implement OData 2.0, make it final and mature
> * Start implementation of OASIS OData draft specification
> * Provide input and feedback for the draft specification to the OASIS
>OData TC based on implementation
> * Implement OData add-ons (library extensions and toolset)
>== Current Status ==
>=== Meritocracy ===
>Most of the initial committers are open source developers with different
>experience levels and many of them have already worked in other open
>source or Apache projects. We will follow standard Apache procedures in
>accepting new contributors to the project team.
>=== Community ===
>Managed by an OASIS Technical Committee, the OData standard definition
>should be based on the idea of a community driven effort.
>Apache OData aims to be a community driven initiative in developing a
>Java OData implementation. Such an approach is allowing more transparency
>and direct feedback even within the definition and improvement of OData
>We encourage everyone interested in OData to join the Apache OData effort.
>=== Core Developers ===
>The development team is international and they have all strong skills in
>OData protocol. Jens Huesken who is member of the OASIS OData TC is
>providing specification feedback since OData 2.0. Stephan Klevenz, also a
>OASIS OData TC member, was a committer of the Apache Chemistry project.
>He has experience with the Incubator and Apache and was also a speaker on
>ApacheCon 2012 in Vancouver. Christian Amend, Michael Bolz and Tamara
>Boehm did implement core parts of the library. Chandan V A, Anirban Roy,
>Chitresh Chauhan, Jobin John and Joerg Singler are working on the JPA
>processor add on.
>=== Alignment ===
>The project builds with Apache Maven, the core runtime requires Apache
>CXF for REST binding (JAX-RS) and the sample scenario can be deployed
>into any compliant Servlet or J2EE container like Apache Tomcat.
>Furthermore we see OData protocol as an option to be supported by other
>Apache projects that have to expose data via a standardized protocol
>based interface.
>== Known Risks ==
>=== Orphaned products ===
>Apache OData is a fresh new codebase that targets the still moving OData
>standardization effort. Thus the future of this project depends heavily
>on the success of the standard. We hope and expect that our
>implementation efforts will strengthen and support the OData standard.
>=== Inexperience with Open Source ===
>Some of the initial committers are experienced open source developers.
>But there are also committers which are new to open source.
>=== Homogenous Developers ===
>The initial committers are from SAP working in different teams. One team
>is from Germany and has implemented the core parts of the library and the
>other team is from India and has implemented the JPA processor add-on.
>=== Reliance of Salaried Developers ===
>All of the initial committers are paid by SAP to work on this or related
>=== Relationships with Other Apache Products ===
>Apache OData will directly use at least the following projects:
> * Apache CXF - for REST bindings
> * Apache Commons - for encoding/decoding
>Other Apache projects may be interested in using Apache OData to add
>OData support once the standard is final.
>=== An Excessive Fascination with the Apache Brand ===
>We value Apache as a neutral place where diverse communities can work
>together on implementing shared standards. We hope that this part of the
>Apache brand helps attract contributions from many potential OData
>standard consumers. However, the brand value is not the main reason why
>we prefer to have this project at Apache.
>== Documentation ==
>This project is still at an early stage, so there is not much
>documentation available. See the OASIS OData page and web site
>for information about the OData standardization effort.
>== Initial Source ==
> * [[]]
> * [[]]
>== Source and Intellectual Property Submission Plan ==
>The complete code is under Apache Software License 2.
>== External Dependencies ==
>All the external dependencies of the initial codebases comply with Apache
>licensing policies.
>== Cryptography ==
>Apache OData is not expected to implement or use cryptographic code.
>== Required Resources ==
>=== Mailing lists ===
> * odata-dev'at'
> * odata-commits'at'
> * odata-private'at'
>=== Subversion Directory ===
>writeable Git Repository (preferred)
>    [[git://]]
>or SVN Directory
>    [[]]
>=== Issue Tracking ===
>    JIRA OData (OData)
>=== Other Resources ===
>    none
>== Initial Committers ==
>|| '''Name'''       || '''Email'''                 ||
>|| Stephan Klevenz  || sklevenz'at'      ||
>|| Jens Huesken     || jens.huesken'at'     ||
>|| Christian Amend  || christian.amend'at'  ||
>|| Michael Bolz     || michael.bolz'at'     ||
>|| Tamara Boehm     || tamara.boehm'at'     ||
>|| Chandan V A      || chandan.v.a'at'      ||
>|| Anirban Roy      || anirban.roy'at'      ||
>|| Chitresh Chauhan || chitresh.chauhan'at' ||
>|| Jobin John       || jobin.john'at'       ||
>|| Joerg Singler    || joerg.singler'at'    ||
>== Affiliations ==
>|| '''Name'''          || '''Affilitation''' ||
>|| Stephan Klevenz     || SAP AG       ||
>|| Jens Huesken        || SAP AG       ||
>|| Christian Amend     || SAP AG       ||
>|| Michael Bolz        || SAP AG       ||
>|| Tamara Boehm        || SAP AG       ||
>|| Chandan V A         || SAP AG       ||
>|| Anirban Roy         || SAP AG       ||
>|| Chitresh Chauhan    || SAP AG       ||
>|| Jobin John          || SAP AG       ||
>|| Joerg Singler       || SAP AG       ||
>== Sponsors ==
> * Florian Mueller
>Nominated Mentors
> * Florian Mueller
> * tbd.
>Sponsoring Entiy
> * Incubator PMC
>==== Links ====
> * [1] [[]]
> * [2] 
> * [3] 
> * [4] 

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