Hypertext Application Language (HAL) is an Internet Draft (a “work in progress”) standard convention for defining hypermedia such as links to external resources within JSON or XML code. The two associated MIME types are media type: application/hal+xml and media type: application/hal+json. HAL was created to be . Ion parsers MUST identify any JSON object as an Ion File either a type member equal to the octet sequence file or the. “Hypermedia Types are MIME media types that contain native hyper-linking semantics that induce application flow. For example, HTML is a hypermedia type; .

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It is in the draft stage at this time.

In this example, the greeting member transitively reflects reflects a value of Hola through the presence of a Value Object. A URI Template needs to be embedded in a hypermedia format. All Ion links have one or more Link Relation Types. But is this a link?

Hypermedia Types

Thanks Dieter for pointing this out. How would a computer get a representation? Ion parsers MUST ignore any discovered maxlength member if the field type equals objectarrayor set. But within their limits, they meet the semantic challenge very well. The story so far: The Claims For and Against Hypermedia Some of the most common arguments for and against hypermedia include: Promises Typefle the Response. It designates a resource: Ion parsers MUST ignore any min member if the type member value does not match one of these values.


The type member represents the type of Ion object encountered. Who says it needs to be form-encoded? Hypertext links in this case allow the developer to rely on YOUR rules and architecture, rather than trying to mimic it with their own.

Thanks for your help. This format may be referred to as “Ion 1.

By continuing to use this site you are giving us your consent to do this. Link rels should be URLs which reveal documentation about the given link, making them “discoverable”. If a field should not be considered required i. A Value Object is used to represent a primary JSON value but also allows for other peer members to provide additional contextual information or metadata regarding the value member.

Having said that, HAL is actually very human-friendly too. From Wikipedia, the free encyclopedia. If so, what should the entity-body look like? How does the client choose?

In cases where a registration decision could be perceived as creating a conflict of interest for a particular Expert, that Tyoefile should defer to the judgment of the other Expert s.


All Ion links have exactly one implicit link relation type. You can read more and make your cookie choices here.

If the Root Object is also found to be an Ion Link, it has an implicit link relation type of self. It’s also simple enough that you can just deal with it as you would any other JSON. A URI is also a short string used hipfrmedia identify a resource.


As far as this book is concerned, the difference is this: The corresponding Form Submission Object for this form might look like this: The plan is typpefile a link like in your example: By adding Hypermedia you are able to add new features more seamlessly- making them immediately available to your users. The World Wide Web works this way, and we all take it for granted hipermesia it should work this way. Hypermedia also does not play a solid role in debugging the implementation of the API when things go wrong.