Extended E-R model 1:1 relationships are called nonidentifying connection relationships in IDEF1X.

Name: Extended E-R model 1:1 relationships are called nonidentifying connection relationships in IDEF1X.
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In the Extended E-R model, 1:1 relationships are represented as nonidentifying connection relationships, which means that the relationship does not create a unique identifier for either entity involved in the relationship. This terminology is used in the IDEF1X standard as well.

Extended E-R Model 1:1 Relationships Are Called Nonidentifying Connection Relationships