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 can be defined in enough detail to convey the application semantics of a wiki or a store. It is typefild to use Internet-Drafts as reference material or to cite them other than as “work in progress.

The registry records the Type Name and a reference to the specification that defines it. If a field should not be considered required i. In fact, many RESTful hypermedia specs including HAL grant you the ability to embed documentation links for quick reference by developers. Two possible requests the client might make. Ion parsers MUST ignore both the minlength and maxlength members if hipermedai maxlength value is less than the minlength value.

The above example has an explicit link relation type of icon. The World Wide Web is full of HTML documents, and the documents are full of things people hipermexia to read—prices, statistics, personal messages, prose, and poetry.

The Hypertext Application Language

The min member value MUST conform to the data type defined by the type member value; Ion parsers MUST ignore any min member where the min value does not conform to the type data type.

The story so far: How can we get similar behavior without consulting a human at each step? They tell the client how to construct an HTTP request: Not a physical copy of the book, but an HTML document that conveys some of its resource state: The max member value MUST conform to the data type defined by the type member value; Ion parsers MUST ignore any max hipermevia where the max value does not conform to the type data type.


URLs are generally quite long and a bit nasty for use as keys. Ion parsers MUST ignore both the minsize and maxsize members if the minsize value is greater than the maxsize value. In this example, the greeting member value is a Spanish language word. If the min member is present, the max value must be greater than or equal to the min value. A Value Object might be used instead to represent hiprrmedia contextual information that might be relevant to user agents.

Hypertext Application Language – Wikipedia

If the max member is present, the min value must be less than or equal to the max value. An Ion Form may not be an Ion Link if and only if that form is nested inside another form or form field.

The type requested e. With Safari, you learn the way you learn best. Reference to the document s that specify the parameter, preferably including URI s that can be used to retrieve copies of the document s. All of them fall under the formal definition of hypermedia given in the Fielding dissertation:.

The Ion Hypermedia Type

In essence, it provides a shortcut for developers that allows them to utilize your API to its fullest without having to rely solely on documentation and writing rules that may or may not not be consistent with those in your application. This shows that hypermedia controls can bridge the semantic gap. The third job of hypermedia is to describe the relationships between resources. This specification uses “Ion” internally.

The referent of an International Resource Identifier. The placeholder member is a short hint string that describes the expected field value.

In cases where a registration decision could be perceived as creating a conflict of interest for a particular Expert, that Expert should defer to the judgment of the other Expert s. An HTML document can embed more than images. There can be multiple links in the ‘curies’ section. Hypermedia controls can guide the client into specifying all four of these. The type value is a string and must equal to one of the octet sequences defined in Ion data type.


By adding the links to your response you are increasing the amount of data that needs to be sent back, and slowly down the responses ever so slightly. The registry records the Member Name and a reference to the specification that defines it.

Other type values MAY exist.

Hypermedia Types

When I think about application semantics, I usually think on a higher level than that. However, to be truly interactive and guide the user, the crucial component of all of this is links, something we use everyday when surfing the web. Your users will thank you. Hypermedia creates more work This is absolutely true. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time.

The entity-body is defined in terms of a set of questions for the client. An HTTP user agent may submit an associated representation that conforms to any of these media types.

If specified, the pattern member string value must conform to the Pattern grammar defined in Ecma Edition hjpermedia. Link rels should be URLs which reveal documentation about the given link, making them “discoverable”.

The typeflie member is a non-negative integer that specifies the maximum number of characters the field value may contain. Associating the latest-posts link with the doc documentation CURIE results in a link ‘rel’ set to doc: It is suggested that multiple Designated Experts be appointed who are able to represent the perspectives of different applications using this specification, in order to enable broadly-informed review of registration decisions.