The difference between suspend and suspendAll

What is the difference开发者_运维知识库 between suspend and suspendAll in SCORM 2004 3rd ED? Can I suspend more than one activity in one session?

In SCORM 2004, "suspending" something indicates that you want to preserve it's state. Think of it conceptually as a pause button, a way to stop and come back to the same place later.

"Suspend" and "SuspendAll" are used in two different contexts. As you probably are aware by now, the SCORM run-time and SCORM sequencing books are separate but related.

"Suspend" is a concept from the run-time book (if I read and understand your question correctly). Setting cmi.exit to suspend indicates that you want to save this set of run-time data for the current SCO so that when the activity is relaunched the data will still be available.

"SuspendAll" is a concept from the sequencing book. It is a navigation request that indicates the learner wants to pause and exit the entire activity tree. When a suspendAll navigation request is processed, the activity tree state (the sequencing data) is preserved and when the course is relaunched, the learner will resume from the current activity.

Some other thing to note:

suspendAll is not related to the preservation of run-time data. If you issue a suspendAll navigation request, that won't in itself preserve the current activity's run-time data.

To confuse matters a bit further, there are two more ways the word "suspend" is used:

"The Suspended Activity" - The activity that was current when a suspendAll navigation request was issued. This is the activity that will be resumed when the course is relaunched.

"Suspended" - a property of every activity that indicates whether it was last exited in a suspended state.

So, to answer your second question, there can only be one "suspended activity" at any given time, but many activities can be "suspended".