From Tapestries MUCK

prop

{prop:propname}
{prop:propname,obj}

Returns the literal string value of the given property.

If no object parameter is passed to it, it looks for the property somewhere down the environment from the trigger object. Otherwise, it looks down the environment from the object specified.

If the property is not found, this returns an empty string. If the property that it tries to access is read restricted and the owner of the trigger object does not own the object that the property is found on, then the MPI script stops with a Permission denied error.

prop!

{prop!:propname}
{prop!:propname,obj}

Returns the literal string value of the given property.

If no object parameter is passed to it, it looks for the property on the trigger. Otherwise, it looks for the property on the object specified. If the property is not found, this returns an empty string. If the property that it tries to access is read restricted and the owner of the trigger object does not own the object that the property is found on, then the MPI script stops with a Permission denied error.