coming and going out of existence relations

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As discussed informally, in the past, I would like (all or some of) the 
following relations added to the reference.

continuant begins_to_exist_during process inverse: process 
has_participant_that_begins_to_exist continuant
continuant ceased_to_exist_during process inverse: process 
has_participant_that_ceases_to_exist continuant

c begins_to_exist_during p
<=>
continuant(c) and process(p) and first_time_point(p,t1) and 
last_time_point(p,t2) and not(exists_at(c,t1)) and exists_at(c,t2)

We don't have first_time_point and last_time_point as relations currently. This 
can be probably be expressed using only part_of and "<" but it looks more 
complicated so perhaps it is easier to just add first and last_time_point. 
relations.

etc.

Original issue reported on code.google.com by alanruttenberg@gmail.com on 25 May 2012 at 8:09

[GoogleCodeExporter]

I need (and have been using) such a relation to indicate cases in which a 
continuant (e.g., rash) begins to exist during an adverse event process. 

Original comment by mcour...@gmail.com on 15 Jun 2012 at 10:09

[GoogleCodeExporter]

I also need such a relation for IDO for modeling (among other things) when 
infections become infectious disorders.

Original comment by albertgo...@gmail.com on 21 Jun 2012 at 4:58