Characteristics and Constraints

Base class of all characteristics. This Characteristics Class can also be instantiated directly (i.e., without creating a subclass).

See declaring characteristics for usage in an Aspect model.

The Trait is used to add one or more Constraints to another Characteristic, which is referred to as the "base Characteristic". A Trait itself has no samm:dataType, because it inherits the type of its samm-c:baseCharacteristic.

See declaring constraints for usage in an Aspect model.

A value which can be quantified and may have a unit, e.g., the number of bolts required for a processing step or the expected torque with which these bolts should be tightened.

See declaring characteristics for usage in an Aspect model.

A measurement is a numeric value with an associated unit and quantity kind.

See declaring characteristics for usage in an Aspect model.

An enumeration represents a list of possible values.

See declaring enumerations for usage in an Aspect model.

A state is subclass of Enumeration with a default value.

See declaring state for usage in an Aspect model.

A time duration.

A group of values which may be either of a scalar or Entity type. The values may be duplicated and are not ordered (i.e., bag semantics).

See declaring collections for usage in an Aspect model.

A subclass of Collection which may contain duplicates and is ordered.

A subclass of Collection which may not contain duplicates and is unordered.

A subclass of Collection which may not contain duplicates and is ordered.

A subclass of Sorted Set containing values with the exact point in time when the values where recorded.

See declaring time series for usage in an Aspect model.

Describes a Property which contains any kind of code. Note that this Characteristic does not define a samm:dataType, this must therefore be done when instantiating the Characteristic.

Describes a Property whose value can have one of two possible types (a disjoint union). This Characteristic does not have one explicit samm:dataType, as it can be the datatype of either the left or the right.

See declaring either for usage in an Aspect model.

Describes a Property whose data type is an Entity. The Entity used as data type may be defined in the same Aspect Model or the shared Entity namespace of the Semantic Aspect Meta Model.

See declaring characteristics for usage in an Aspect model.

Describes a Property which contains a scalar string-like value space value with a well-defined structure. The Structured Value Characteristic allows the description of the parts of the Property’s value by linking to a separate Property definition for each part. To define the parts, the value is deconstructed using a regular expression.

See declaring structured value for usage in an Aspect model.

Concatenating the values of the Properties in the elements list with the string literals in the given order should yield a value that corresponds to the original value that has this Structured Value Characteristic. While the deconstructionRule is used for deconstruction, the string literals in the elements list are used for construction. When the Property using the Structured Value Characteristic also defines an exampleValue, construction and deconstruction of the value are tested when validating the model.

Describes a Property which contains the date and time with an optional timezone.

dataType: xsd:dateTime

Describes a Property which contains plain text. This is intended exclusively for human readable strings, not for identifiers, measurement values, etc.

dataType: xsd:string

Describes a Property which contains plain text in multiple languages. This is intended exclusively for human readable strings, not for identifiers, measurement values, etc.

dataType: rdf:langString

Represents a boolean value (i.e., a "flag").

dataType: xsd:boolean

Describes a Property containing a locale according to IETF BCP 47 [bcp47], for example "de-DE".

dataType: xsd:string

Describes a Property containing a language according to ISO 639-1 [iso639], for example "de".

dataType: xsd:string

Describes a Property that contains the path to a relative or absolute resource.

dataType: xsd:anyURI

Describes a Property that contains a MIME type as defined by RFC 2046 [rfc2046], for example "application/json", "application/xls" or "image/png".

dataType: xsd:string

Describes a Property containing a reference to one of the units in the Unit catalog.
See Using Unit Reference for usage in an Aspect model.

dataType: samm:curie

Base class for other constraints that constrain a Characteristic in some way, e.g., the Range Constraint limits the value range for a Property.

The Constraint class has no attributes.

Restricts a value to a specific language.

Restricts a value to a specific locale, i.e., a language with additional region information.

Restricts the value range of a Property. At least one of samm-c:maxValue or samm-c:minValue must be present in a Range Constraint.

Whether the samm-c:maxValue and samm-c:minValue are inclusive or exclusive can be defined using the samm-c:upperBoundDefinition and samm-c:lowerBoundDefinition attributes. When one or both of them are not specified, the corresponding value defaults to inclusive.

This Constraint can be used to restrict Characteristics with one of two kinds of data types:

Restricts the encoding of a Property.

This Constraint can be used to restrict two types of Characteristics:

At least one of samm-c:maxValue or samm-c:minValue must be present in a Length Constraint.

Restricts a string value to a regular expression as defined by XQuery 1.0 and XPath 2.0 Functions and Operators [xpath-functions].

Defines the scaling factor as well as the amount of integral numbers for a fixed point number. The constraint may only be used in conjunction with Characteristics which use the xsd:decimal data type.