Sequence Diagram的Interaction Frame運算子

http://en.wiktionary.org/wiki/Appendix:Glossary_of_Unified_Modeling_Language


alt - multiple alternatives each with a Guard. Only one alternative can be true.
opt - single alternative with a guard condition.
par - each fragment is run in parallel.
loop - the fragment iterates according to a guard condition.
region - only one Thread can enter the fragment at a time.
neg - an invalid interaction.
ref - an interact defined in another diagram.
sd - inclusion of a complete Sequence diagram in the fragment.