The CLASS_CONSTRAINT_SCHEMA schema type defines constraint definitions that can be assigned to a class (aka. category) using the Constraint schema property.

Naming convention

To easily identify pages that contain a constraint schema it is suggested to use smw/schema:Constraint:... as naming convention.

Properties

• type defines the type and is fixed to CLASS_CONSTRAINT_SCHEMA
• constraints the section that contains constraints definitions
• tags simple tags to categorize a schema

Example

{
    "type": "CLASS_CONSTRAINT_SCHEMA",
    "constraints": {
        ...
    },
    "tags": [
        "class constraint",
        "..."
    ]
}

Constraint properties

• mandatory_properties (array) specifies mandatory properties
• shape_constraint (array) specifies shapes of properties and dependent characteristics
  • property specifies the related property
  • property_type specifies expected type of the property
  • max_cardinality specifies the maximum number of values a property can contain for the given context
  • min_textlength specifies the minimum length of the characters expected for values assigned to the property
• https://github.com/SemanticMediaWiki/SemanticMediaWiki/blob/master/docs/examples/register.custom.constraint.md "`custom_constraint`" (object) specifies non-schema specific custom constraints implementations

Extending constraints

• General introduction on how to extend a https://github.com/SemanticMediaWiki/SemanticMediaWiki/blob/master/docs/architecture/extending.constraint.md "constraint" in Semantic MediaWiki
• How to register a https://github.com/SemanticMediaWiki/SemanticMediaWiki/blob/master/docs/examples/register.custom.constraint.md "custom constraint" using the custom_constraint property

Validation

/data/schema/class-constraint-schema.v1.json