!!! Overview
A [SCIM Resource] 

[SCIM] may be extended to define new classes of [SCIM Resources] by defining a new [SCIM meta.ResourceType]. 

Each [SCIM meta.ResourceType] defines the name, endpoint, base schema (the attributes), and any schema extensions registered for use with the resource type.  In order to offer new types of resources, a service provider defines the new resource type as specified in Section 6 and defines a schema representation (see Section 8.7 [RFC 7643]).

[SCIM] also allows [SCIM Core Resources] to have extensions in addition to their [SCIM Core Schema].

This is similar to how "[objectClasses]" are used in LDAP [RFC 4512].  However, __unlike__ LDAP, there is no inheritance model. All extensions are additive (similar to the LDAP [AUXILIARY] [objectClasses]

Each value in the [SCIM Schemas Attribute] indicates additive schema that __MAY__ exist for a [SCIM Resource] representation.  The [SCIM Schemas Attribute] __MUST__ contain at least one value, which __SHALL__ be the base schema for the [SCIM Resource]. 

The [SCIM Schemas Attribute] __MAY__ contain additional values indicating [SCIM Extended Attributes] that are in use.  [SCIM schemaExtensions] __SHOULD__ avoid redefining any attributes defined in [RFC 7643] and __SHOULD__ follow conventions defined in [RFC 7643].  Except for the base object schema, the schema extension [URI] __SHALL__ be used as a [JSON] container to distinguish attributes belonging to the extension [namespace] from base schema attributes.  

See Figure 5, which is an example of the JSON representation of an enterprise User and is also an example of a User with extended schema.

In order to determine which [URI] value in the [SCIM Schemas Attribute] is the [SCIM Base Schema] and which is an [SCIM schemaExtensions] for any given [SCIM Resource], the [SCIM Resource]'s [SCIM meta.ResourceType] attribute value MAY be used to retrieve the [SCIM Resource]'s [SCIM meta.ResourceType] schema (see Section 6).  See the "ResourceType" representation in Figure 8 for an example.

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