Concluding and summarizing the above discussion we finally depict two possible types of relation in the UBIK metamodel:
[[File:UDOM_Relating5_RefRel.png|500 400 px]] <div style="padding: 5px; border: 1px solid black; background-color: #B7DEE8;">;UBIK metamodel:* <b>1 : n</b> relationships are called <b>“References”</b> (one pump refers to exactly one plant)* <b>n : n</b> relationships are called <b>“Relations”</b> (two pumps are controlled by two armatures, one pump is controlled by one armature)</div>