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# EIS One-to-One Mapping

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An EIS one-to-one mapping is a reference mapping that represents the relationship between a single source and target object. The source object usually contains a foreign key (pointer) to the target object (key on source). Alternatively, the target object may contain a foreign key to the source object (key on target). Because both the source and target object use interactions, they must both be of a root object type (see "Configuring an EIS Descriptor as a Root or Composite Type")

Table: EIS One-to-One Mapping by EIS Record Type summarizes the behavior of this mapping depending on the EIS record type you are using.

EIS One-to-One Mapping by EIS Record Type

EIS Record Type | Mapping Behavior
--- | ---

Indexed

A new indexed record is created for the target objectFoot 1 :

- With the Key on Source use case, the foreign key(s) is added to the record for the source object.

- With the Key on Target use case, the foreign key(s) is added to the record for the target object

Mapped

A new mapped record is created for the target objectFootref 1:

- With the Key on Source use case, the foreign key(s) is added to the record for the source object.

- With the Key on Target use case, the foreign key(s) is added to the record for the target object

XML

.A new XML record is created for the target object:

- With the Key on Source use case, the foreign key(s) is added to the record for the source object.

- With the Key on Target use case, the foreign key(s) is added to the record for the target object

Footnote 1 See also "Reference EIS Mappings".

This section describes the following:

- EIS One-to-One Mappings With Key on Source

- EIS One-to-One Mappings With Key on Target

See Configuring an EIS One-to-One Mapping for more information.