Hotspot creation and execution

Hello All,

I am new to Hotspot creation in isodraw as the new requirement of the S1000D 4.1.

Could any one help me out in:

1. Primitives for creating HOTSPOTs in ISODRAW.

2. What elements have to be included in the isodraw file.

3. Is Companion file required for creation and execution of HOTSPOTs in publishing.

4. How to link the Authoring XML files to .cgm files (As this is our output files).

If possible Please suggest some examples

Thanks in advance,

Mahesh C J