An instance of OM class DS_C_AVA (Attribute Value Assertion) is a proposition concerning the values of a directory entry.
An instance of this OM class has the OM attributes of its superclasses, OM_C_OBJECT and DS_C ATTRIBUTE, and no other OM attributes. An additional restriction on this OM class is that there must be exactly one value of the OM attribute DS_ATTRIBUTE_VALUES. The DS_ATTRIBUTE_TYPE remains single valued. The OM value syntax of DS_ATTRIBUTE_VALUES must conform to the rules outlined in XDS Interface Description.