Hi,
Is there /really/ any need for *six* coordinate formats? It's hard
enough to learn a new process without basics like this tripping you up.
There is nobody who is trusted enough to set an universal standard:
https://xkcd.com/927/
Basically, there is an ISO standard
https://en.wikipedia.org/wiki/ISO_6709
to have latitude before longitude. Leaflet complies, OpenLayers does not.
This is for historical reasons. When multiple projections were
commonplace as exchange formats, then they often used x and y as names
for the two numbers, and x often decoded to something loosely or tightly
related to longitude.
However, OpenLayers is too useful to be thrown out just for having the
wrong coordinate order. The same applies to a lot of other tools with
legacy coordinate order.
To have a gentle pressure towards the ISO standard, the advertised
interface is latitude-longitude. There are some precautions for inert
legacy tools:
http://dev.overpass-api.de/blog/bounding_boxes.html#lonlat_bbox
As Lester has pointed out, XML requires explicit parameter names. By the
way, I am not aware of anybody actively using the XML syntax. You can
safely ignore that.
For the delimiter question: There are programming languages with a
combined market share of almost 90% that agree to have to semanticy in
whitespace. The sole widespread-used exception is Python. Once again:
Are you seriously asking the OSM community for a crusade to throw out
Python for minor syntactic infrigement?
Beside Python, the delimiters are always commas and semi-colons. As
commas tend to be used to delimit parameters, they are for the numbers
of the bounding box the delimiters of choice.
Cheers,
Roland
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