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Airí aonáin, i.e. cuireann sé síos ar an aonán ar shlí éigin. Do gach tarlú den aonán sin, socraítear na tréithe ag luach cuí, luach a thógtar ón bhfearann. Tugtar mír sonraí ar thréith, freisin. B'fhéidir go mbeadh tréith roghnach, i.e., d'fhéadfadh aonán tarlú gan luach a bheith tugtha do thréith chomh luath is a chruthaítear an tarlú.
A property of an entity, i.e., it describes the entity in some way. For each occurrence of that entity, the attributes are set to an appropriate value, the value being drawn from a domain. An attribute is also known as a data item. An attribute may be optional, i.e., an entity occurrence may exist without a value for an attribute being given as soon as the occurrence is created.