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A query pattern that reads data from the domain.

Hierarchy

Index

Properties

Properties

Optional @context

@context: Context

An optional JSON-LD Context for the query. Use of a query-specific Context is rarely required, as the context is typically the local application, whose needs are specified by the local clone configuration.

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 filters for subject identities, properties and values, including inline filters.

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