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A query pattern that reads data from the domain.

Hierarchy

Index

Properties

Properties

Optional @context

@context: Context

A JSON-LD Context for the query. In an API, this will frequently be implicit. For example, using json-rql as the body of a POST to http://example.com/my-api/v1/person/query might have the implicit context of a Person (possibly found at http://example.com/my-api/v1/person).

see

examples https://github.com/gsvarovsky/json-rql/search?l=JSON&q=context&type=Code

Optional @where

@where: Subject | Subject[] | Group

The data pattern to match, as a set of subjects or a group. Variables are used as placeholders to capture matching properties and values in the domain.

Examples:

Match a subject by its @id

{
  ...
  "@where": { "@id": "fred" }
}

Match a subject where any property has a given value

{
  ...
  "@where": {
    "@id": "?id",
    "?prop": "Bedrock"
  }
}

Match a subject with a given property, having any value

{
  ...
  "@where": {
    "@id": "?id",
    "name": "?name"
  }
}

The Javascript engine supports exact-matches for subject identities, properties and values. Inline filters will be available in future.

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