Keyword glossary

Denotes the beginning of a Match stage in a data pipeline, sed to match existing data instances in the database.

Denotes the beginning of a Fetch stage in a data pipeline, used to format the output of a data pipeline into JSON.

Denotes the beginning of an Insert stage in a data pipeline, used to add new data instances into the database.

Denotes the beginning of a Delete stage in a data pipeline, used to remove existing data instances from the database.

Denotes the beginning of an Update stage in a data pipeline, used to modify existing data instances in the database.

Denotes the beginning of a Put stage in a data pipeline, used to add new data instances to the database if they do not already exist.

Denotes the beginning of a Select operator in a data pipeline, used to keep specified variables for each element of the data stream and remove the rest.

Denotes the beginning of a Require stage in a data pipeline, used to remove elements from the data stream that do not contain specified optional variables.

Denotes the beginning of a Sort operator in a data pipeline, used to order the elements of the data stream based on the value of specified variables.

Denotes the beginning of a Limit operator in a data pipeline, used to keep a specified number of elements of the data stream and remove the rest.

Denotes the beginning of an Offset operator in a data pipeline, used to remove a specified number of elements from the data stream.

Denotes the beginning of a Reduce operator in a data pipeline, used to perform reduction operations on the data stream according to specified groupings.

Denotes the beginning of a With stage in a data pipeline, used to define functions on an ad-hoc basis for use in the data pipeline.

Constructs an entity statement, used to define a new entity type.

Constructs a relation statement, used to define a new relation type.

Constructs an attribute statement, used to define a new attribute type.

Constructs a struct statement, used to define a new struct type.

Constructs a fun statement, used to to define a new function.

Constructs a sub statement, used to define the supertype of a type.

Constructs a relates statement, used to define a new role for a relation type.

Constructs a plays statement, used to define a new roleplayer for a role.

Constructs a value statement, used to define the value type of an attribute type.

Constructs an owns statement, used to define a new owner of an attribute type.

Constructs an alias statement, used to define an alias label for a type.

Constructs an isa statement, used to specify the type of a data instance.

Constructs a links statement, used to specify the roleplayers in a relation.

Constructs a has statement, used to specify an attribute of an entity or relation.

Constructs an is statement, used to specify that two variables represent the same data instance.

Constructs a let …​ = statement, used to assign the result of an expression to a variable.

Constructs a let …​ in statement, used to assign a stream or list element to a variable.

Constructs a contains statement, used to specify that a stream or list contains a data instance, or that a string contains a specified substring.

Constructs a like statement, used to specify that a string matches a specified regex pattern.

Constructs a label statement, used to identify a type by its label.

Constructs an iid statement, used to identify a data instance by its internal ID.

Describes a @card annotation, used to specify cardinality ranges for roles and ownerships.

Describes a @cascade annotation, used to specify behaviour when deleting a relation’s roleplayers.

Describes an @independent annotation, used to prevent attributes without owners from being deleted automatically.

Describes an @abstract annotation, used to specify that a type or role is abstract.

Describes a @key annotation, used to specify key attributes for entities and relations.

Describes a @subkey annotation, used to specify composite keys built from multiple attributes.

Describes a @unique annotation, used to specify unique attributes for entities and relations.

Describes a @values annotation, used to specify a set of permitted values for attributes.

Describes a @range annotation, used to specify a range of permitted values for attributes.

Describes a @regex annotation, used to specify a regex pattern for permitted values of attributes.

Describes a @distinct annotation, used to restrict an owned list of attributes to distinct values.