HIPERMEDIA TYPEFILE PDF

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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Note that other groups may also distribute working documents as Internet-Drafts. 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. It is inappropriate to use Internet-Drafts as reference material or to cite them typefild than as “work in progress. Copyright c Ion Working Group and persons identified as document authors.

HTTP is commonly used to transfer data in many different data formats. The referent of an International Resource Identifier. A JSON object with members that describe a named value that may be collected and submitted to a linked resource location.

A Form that is also a Link. A Value Object where the value member is a Base64URL-encoded byte array that also has mimetype and name members representing file metadata. Any future version will hupermedia represented with a media type parameter named v with a semantic version value.

A Value Object exists to represent a primary JSON value, but it also might have other members that are contextually relevant to the value. For example, one might add a lang member to indicate a spoken language:. For example, assume that someone named “Joe” is an employee of the “Acme” corporation.

The reason is that other members within the Collection Object may provide additional contextual information about the value array itself or the elements in the value array, something not possible with a direct array.

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For example, a Collection Object could have an eform “element form” member to represent the structural ‘form’ of each element in the value array instead of repeating this information in every array element:. Collection Objects can have other members to build up rich functionality.

More members can be added to build up rich functionality. For example, a Collection Resource with discoverable pagination:. If these words are used without being spelled in uppercase then they are to be interpreted with their normal natural language meanings, without any normative meaning. 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.

Hypertext Application Language

In this example, the greeting member value is a Spanish language word. A Value Object might be used instead to represent additional contextual information that might tjpefile relevant to user agents.

In this example, the greeting member transitively reflects reflects a value of Hola through the presence of a Value Object.

The string MAY be the empty string to indicate a file of zero length. Because this file object is not an element within a Collection Object, the type member is required. The name member is the string name of the file. This value is the unqualified file name, without path information. If the file name cannot be determined or represented, the blank string must be used.

The type member represents the type of Ion object encountered. All Ion links have one or more Link Relation Types. All Ion links have exactly one implicit link relation type. The implicit link relation type can be one of three possible values depending on where the link is located in the Ion content:. If the Root Object is also found to be an Ion Link, it has an implicit link relation type of self. The above example shows an Ion Link member named employer.

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Any Ion Link in a Collection Object ‘s value array is implicitly assigned the item link relation type. The above example has 2 Links in its value array. Each of these 2 links are implicitly assigned the item link relation type. The above example has an explicit link relation type of icon. Ion parsers MUST ignore any Link rel member with value of nullnot a string, an empty string, or a whitespace-only blank string.

If data can be submitted to a linked resource location, information about that data must be made available to a hypermedia client so it can collect and then submit the data.

An Ion Form represents named data values that may be submitted to a linked resource location. An Ion Form is then effectively a collection of form fields with additional metadata that controls how the form fields are submitted to a linked resource location.

An Ion Form may not be an Ion Link if and only if that form is nested inside another form or form field. The JSON object has a value array member with a value that is not null or empty.

The description member is a string description of the field that may be used to enhance usability, for example, as a tool tip. The name “eform” is short for “element form”. If the eform member exists and is valid, and the etype member does not exist or equals nullan Ion parser MUST assign the field an etype member with a value of object. The enabled member indicates whether or not the field value may be modified or submitted to a linked resource location.

The enabled member is a boolean; it must equal either true or false. If the enabled member is not present, or if it present and equal to truethe field may be modified or submitted a linked resource location. The name “etype” is short for “element type”.

If the etype member equals null and the eform member exists and is a valid Ion form, an Ion parser MUST assign the etype member a value of object.

Hipermediq it has been determined that the etype member should be evaluated, a validating user agent MUST ensure each element in the fields values array adheres to the specified etype and any valid eform before form submission. The form member value is either a Form object or a Link to a Form hipermeda that reflects the required object structure of the Field value. Ion parsers MUST ignore a discovered form member if the field type member does not equal object.

Where a Form contains nested Forms in this manner, the resulting collected data will form an object graph. The max member indicates that the field value must be less than or equal to the specified max value.

The max member value MUST conform to the data type defined by the type member value; Ion parsers MUST ignore any max member where the max value does not conform to the type data type. The max member value may only be defined when the type value is equal to numberintegerdecimaldatedatetimedatetimetztimeor timetz as defined in Ion Value Object Type Values.

Ion parsers MUST ignore any max member if the type typfile value does not match one of hilermedia values. If the min member is typefiile, the max value must be greater than or equal to the min value. Ion parsers MUST hipermeda both the min member and the max member if hipermediq max value is less than the min value.

The maxlength member is a non-negative integer that specifies the maximum number of characters the field value may contain.

Ion parsers MUST ignore any maxlength member that has a negative integer value. Ion parsers MUST ignore any discovered maxlength member if the field type equals objectarrayor set. Ion parsers MUST ignore both the minlength and maxlength members if the maxlength value is less than the minlength value.

The maxsize member value is a non-negative integer that specifies the maximum number of field values that may be submitted when the field type value equals array or set. Ion parsers MUST ignore any maxsize member that has a negative integer typefilr. If the ty;efile type value does not equal array or setan Ion parser MUST ignore any discovered maxsize member for that field. Ion parsers MUST ignore both the minsize and maxsize members if the maxsize value is less than the minsize value.

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The min member indicates that the field value must be greater than or equal to the specified min value. 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 min member value may only be defined when the type value is numberintegerdecimaldatedatetimedatetimetztimeor hipermeia as defined in Ion Value Object Type Values.

Hypertext Application Language – Wikipedia

Ion parsers MUST ignore any min member if the type member value does not match one of these values. If the max member is present, the min value must be less than or equal to the max value. Ion parsers MUST ignore both the min member and the max member if the min value is greater than the max value. The minlength member is a non-negative integer that specifies the minimum number of characters the field value must contain. Ion parsers MUST ignore any minlength member that has a negative integer value.

Ion parsers MUST ignore any discovered minlength member if the field type equals objectarrayor set. Ion parsers MUST ignore both the minlength and maxlength members if the minlength value is greater than the maxlength value.

hipermmedia The minsize member value is a non-negative integer that specifies the minimum number of field values that may be submitted when the field type value equals array or set.

Ion parsers MUST ignore any minsize member that has a negative integer value.

If the field type value does not equal array or set hlpermedia, an Ion parser MUST ignore any discovered minsize member for that field. Ion parsers MUST ignore both the minsize and maxsize members if the minsize value is greater than the maxsize value.

The mutable member is a boolean; it must equal either true or false. When an options member is present and the form field type does not equal set or arrayany form field value specified MUST equal one of the values found within the Option array.

If the field type is not set or arrayIon parsers MUST ignore any option where the option value type is not the same as the field type. The pattern member is a JSON string that defines a regular expression used to validate the field value.

The Hypertext Application Language

If specified, the pattern member string value must conform to the Pattern grammar defined in Ecma Edition 5. The placeholder member is a short hint string that describes the expected field value. The required member is a boolean; it must equal either true or false.

If a field should not be considered required i. The secret member indicates whether or not the field value is considered sensitive information and should be kept secret.

The secret member is a boolean; it must equal either true or false. A true value indicates that the field value is considered sensitive and should be kept secret.

If trueuser agents MUST mask the value so it is not directly visible to the user. If the secret member is not present, or if it present and equal to falsethe field value is not considered sensitive information and does not need to be kept secret.

The type member specifies the mandatory data type that the value member value must adhere to. The type value is a string and must equal to one of the octet sequences defined in Ion data type.