The Node Relationships module provides methods to complete two way relationships between content types enhancing the features of node reference fields.
Backreference Module provides a nodeapi interface to maintain 1-1 relationships between all shared instances of a nodereference field. This means that given a field instance of field_reference1, if you add a reference to NodeBeta to NodeAlpha's field_reference1 and NodeBeta has an instance of field_reference1, then NodeAlpha will be added to NodeBeta's instance of field_reference1.
The overall purpose of the Nodereference Explorer module is to provide a comfortable and user-friendly way of referencing content. Content authors should be able to link internal arbitrary nodes, e. g. content types such as pages, stories, news, images etc., to each other.
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