Last update 17 December 2002 24 October 2002 Restructured the schemas that were submitted as public draft. Created attribute groups for those attributes that are used in multiple element definitions. Created re-usable attribute groups. Defined groups for those content models that need to be extended in levels B and C. Designed modules for those elements and attributes that are re-used in levels B and C or in the global elements. Changed the namespace. This module contains elements and attributes that are used in the other levels and in the global elements. This module contains the email-data model. The attributes are declared here as reusable attribute groups, because most are re-used in several elements. Additional attributes are declared in the modules. Implementations should provide a default value (a, b or c) for each of the schema levels. This attribute is also used in level B. This attribute is also used in level B. This attribute is also used in level B. Also used in global elements This content model is used in several elements that refer to resources. This group is used to indicate the metadata schema. The schema to be used and its version must be indicated and the schema must be imported. These groups are needed for extension in level B. Include IMS Metadata here, using the correct namespace A named complex type is needed because this element is redefined in level B. Format is duration datatype (PnYnMnDTnHnMnS) Format is duration datatype: PnYnMnDTnHnMnS Simple Sequencing can be included here, using its namespace. The namespace must be defined in the instance, and the schema must be imported. Used to provide the relevant schema. Used for those elements that refer to resources. This placeholder can be used to import elements from another namespace. The namespace for the imported element must be defined in the instance, and the schema must be imported. This placeholder can be used to import elements from another namespace. The namespace for the imported element must be defined in the instance, and the schema must be imported. This simple type is defined as simple content because it needs to be extended with an attribute in level B. Format is duration datatype: PnYnMnDTnHnMnS