XmlmmCIF equivalent: entity_link Data items in the ENTITY_LINK category give details about the linkages between entities. XmlmmCIF equivalent: entity_link/details A description of special aspects of a linkage between chemical components in the structure. XmlmmCIF equivalent: entity_link/entity_id_1 The entity id of the first of the two entities joined by the linkage. This data item is a pointer to _entity.id in the ENTITY category. XmlmmCIF equivalent: entity_link/entity_id_2 The entity id of the second of the two entities joined by the linkage. This data item is a pointer to _entity.id in the ENTITY category. XmlmmCIF equivalent: entity_link/entity_seq_num_1 For a polymer entity, the sequence number in the first of the two entities containing the linkage. This data item is a pointer to _entity_poly_seq.num in the ENTITY_POLY_SEQ category. XmlmmCIF equivalent: entity_link/entity_seq_num_2 For a polymer entity, the sequence number in the second of the two entities containing the linkage. This data item is a pointer to _entity_poly_seq.num in the ENTITY_POLY_SEQ category. XmlmmCIF equivalent: entity_link/link_id This data item is a pointer to _chem_link.id in the CHEM_LINK category.