IDEF1X   Notations 

Non-identifying connection relationship (1-1 and 1-N)

  

The standard notation                                  Child-----------------Parent

                                                                      0 - - N                      1- -1

 

Adding    P                                               Child-- P ---------------Parent

                                                                 1 - - N                            1- -1

 

Adding                                                  Child---------------- Parent

                                                                 0 - - N                      0- -1

 

 Adding 1                                               Child-1----------------Parent

                                                                 1- -1                           1- -1

 

Adding Z                                                Child--Z---------------Parent

                                                                 0 - - 1                          1- -1

 

Identifying connection relationship( weak entity or ID- dependent, i.e. the Parent’s ID must be part of the Child ‘s ID).

 

The standard notation                            Child                                              Parent

                                                                 0 - - N                      1- -1

 

 

Adding    P                                               Child P                                         Parent

                                                                 1 - - N                          1- -1

 

 

Adding 1                                                 Child    1                                             Parent

                                                                 1- -1                           1- -1

 

Adding Z                                                Child        Z                                           Parent

                                                                 0 - - 1                          1- -1

  Non-Specific Relationship (N-to-N)

                                                             EntityA                                                      EntityB

                        

The IDF1X notations allow to draw a Many-to-Many relationship, however it is strongly recommended to convert it to two ID-dependent relationships (See Figure 2-21 in IDF1X2).

 

Categorization Relationship

It is basically the Super-Subtype relation relationship of the Extended ER notation (See Figures 2-22 and 2-23 in IDF1X2).

 

Comparison between IDF1X and Extended ER Model

See Figure 2-16 in IDF1X2.