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The objective of the `SMW_NS_SCHEMA` (aka Schema) namespace is to allow for a structured definition of different schemata where types define the interpreter, syntax elements, and constraints.
The namespace expects a JSON format (or if available, YAML as superset of JSON) as input format to ensure that content elements are structured and a validation a [JSON schema][json:schema] can help enforce requirements and constraints for a specific type.
The following properties are provided to make elements of a schema definition discoverable.
* Schema type (`_SCHEMA_TYPE` )
* Schema definition (`_SCHEMA_DEF`)
* Schema description (`_SCHEMA_DESC`)
* Schema tag (`_SCHEMA_TAG`)
* Schema link (`_SCHEMA_LINK`)
## Registration
Extensibility for new schema types and interpreters is provided by adding a type to the `$smwgSchemaTypes` setting.
<pre>
$GLOBALS['smwgSchemaTypes'] = [
'LINK_FORMAT_schema' => [
'validator_schema => __DIR__ . '/data/schema/...',
'group' => SMW_schema_GROUP_FORMAT,
]
];
</pre>
[json:schema]: http://json-schema.org/
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