[IBIS] Open Drain models

Hi Experts,
                    Can the "open_drain" pin be treated  as input or 
output only ? How can it be defined it in the ibis file? I have 
generated Open_drain models and now I need them as input/output type too.

Is the following syntax correct ?
model_type        Input_Open_drain ?
model_type       Output_Open_drain ?

with best regards,
Mithlesh

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Mithlesh Shrivas (Core-id:R64034).......
Design Engineer.........................
Freescale Semiconductor India Pvt. Ltd..
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Floor Nos. 5, 6 & 7, Plot# 15 & 16......
Sector- 16A, Noida- 201301 U.P. (India).
Mobile: +91-9811824928..................
Office: +91-120-539-6149 (extn)........
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