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| <h1 class="page">Other Representations</h1> |
| <div class="paragraph"> |
| <p>Sometimes though you may want to extend or change the representations generated. This might be because you want to |
| write a RESTful client that uses a particular library (say a Javascript library or web components) that can only handle representations in a certain form.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Or, you might want to have Apache Isis generate representations according to some other "standard", of which there are |
| many:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Mike Kelly’s <a href="http://stateless.co/hal_specification.html">HAL</a> specification</p> |
| </li> |
| <li> |
| <p>Mike Amundsen’s <a href="http://amundsen.com/media-types/collection/">Collection+JSON</a> specification</p> |
| </li> |
| <li> |
| <p>Kevin Swiber’s <a href="https://github.com/kevinswiber/siren">Siren</a> specification</p> |
| </li> |
| <li> |
| <p>Steve Klabnik’s <a href="http://jsonapi.org/">JSON API</a> specification</p> |
| </li> |
| <li> |
| <p>Gregg Cainus' <a href="https://github.com/cainus/hyper-json-spec">Hyper+JSON</a> specification</p> |
| </li> |
| <li> |
| <p>the W3C’s <a href="https://www.w3.org/TR/json-ld/">JSON-LD</a> specification</p> |
| </li> |
| <li> |
| <p>Markus Lanthaler’s <a href="http://www.markus-lanthaler.com/hydra/">Hydra</a> specification.</p> |
| </li> |
| </ul> |
| </div> |
| <div class="paragraph"> |
| <p>A good discussion about the relative merits of several of these different hypermedia formats can be found <a href="https://groups.google.com/forum/#!msg/api-craft/NgjzQYVOE4s/EAB2jxtU_TMJ">here</a>.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Or, of course, you may have your own internal specification that you wish to use.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Supporting any of these alternative representations can be achieved by providing a suitable implementation of |
| <code>ContentNegotiationService</code>. The existing implementations (eg <code>ContentNegotiationServiceSimplified</code>) can be used as a |
| starting point.</p> |
| </div> |
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| <div class="paragraph"> |
| <p>These will, admittedly, need to access the internal APIs for the Apache Isis metamodel, and you should be aware that |
| these are not formal API; they may change over time. That said, they are very stable and have not changed |
| significantly over the last few years.</p> |
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