<div dir="ltr"><div><div><div><div>H Mattias,<br><br></div>Just as OSM has no notion of a named road (it can be lots of linear pieces) and the named road is deduced by proximity, so in OHM we have no notion of a single object changing through time, instead such links need to be done by both geographical and chronological proximity.<br><br></div>Te reason for this is fairly straightforward. In a full relational model the pieces of a road would be in a 1:m relationship with the road object. Similarly in a temporal relational database for a boundary there would be many entries each with a distinct non-overlapping time range. This type of direct relationship is not possible with tags, although you could use relations. <br><br></div>What we do not know is how easy it is to pull boundaries for different time periods together.<br><br></div>Jerry<br></div><div class="gmail_extra"><br><div class="gmail_quote">On 29 April 2015 at 05:20, H MK <span dir="ltr"><<a href="mailto:sockenkartor@gmail.com" target="_blank">sockenkartor@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div><div><div>Hello everybody!<br><br></div>In the Stockholm area there are now boundaries for many ecclesiastical parishes. In the city of Stockholm, the census districts for the time they existed (1877–1926) should be done, even if they need a lot of fact checking.<br><br></div>In order to separate different areas of the same entity, I have named both the parishes and the census district with the years they had that territorial extension. This is not satisfactory. Reasonably, a parish is the same object after a minor territorial change. As it is now, they become a new object whenever there is a change. Or, is it ok to have several objects with the same name? I would like to strip the years from names.<br><br></div>/Mattias<br></div>
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