Aggregate page

This page shows one aggregate, which can be attribute value or sub value
ofother aggregate. At the top type of aggregate are given in EXPRESS style.
Types can be BAG, SET, LIST and ARRAY. Operations and view are a little bit
different for all these types. After that all members are given. ForARRAY
types keywords 'UNSET' are given for non set members. At the bottomare line
where you can enter new value. By pressing 'Add' button value fromthis field
will be added at the selected position. 'Get' and 'Set' buttonsare for sdai
clipboard operations. With get you can get selected element and with set
add add new element. 'Remove' button will remove or unset selectedelement.