When data elements (or members) are added to a collection, they are assigned a unique sequence ID. As you add members to a collection, the sequence ID is change in increments of 1, with the newest members having the largest ID.
You add new members to a collection using the
ADD_MEMBER function. Calling this function returns the sequence ID of the newly added member.
You can also add new members (or an array of members) to a collection using the
ADD_MEMBERS procedure. The number of members added is based on the number of elements in the first array.