[OSM-dev] Ways

[ant]

I'm currently writing processing software and a couple of questions 
regarding ways have come up. None of the following examples makes 
practical sense, and I believe (hope) that the editors prevent such 
things from happening. But what about ...

... subsequent duplicate references?

<way>
	<nd ref="1"/>
	<nd ref="2"/>
	<nd ref="2"/>
	<nd ref="3"/>
</way>

... closed ways trivial enough not to represent an area?

<way>
	<nd ref="1"/>
	<nd ref="2"/>
	<nd ref="1"/>
</way>

<way>
	<nd ref="1"/>
	<nd ref="1"/>
</way>


The reason why it bothers me is that I feel my program should deal with 
these cases. So the technical part of my question is: How does the API 
handle it? Which of the above should I expect to be found in the planet 
file, which not?

cheers
ant