<div dir="ltr"><div dir="ltr"><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Mar 11, 2020 at 10:55 AM David Berry <<a href="mailto:d.berry@eaobservatory.org">d.berry@eaobservatory.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,204);padding-left:1ex">For me the distinction between an Operation and a Mapping is a bit<br>
muddled as many operations are in fact bidirectional. <br></blockquote><div><br></div><div>The alternate view (in the current model) is that <u>no</u> Operation is bidirectional, but some Operations may be trivially inverted to create an inverse Operation.</div><div> Y = X + 1 is unidirectional.. from X to Y; and can be trivially inverted to X = Y - 1; for the inverse Operation from Y to X.</div><div><br></div><div>I'll workup the model in the way we've talked about here, and see how that plays out in the example serializations for you.</div><div><br></div><div>I'm currently working through the Coords model examples, and will queue that up next.</div><div><br></div><div>Mark</div><div><br></div></div></div>