I know nothing about it, so I can feel free to answer:-) Don’t care about the file format- look at the array format, probably in the IDE/debugger. That’s probably going to let you see how to address the individual nodes. Alex
Sent from my iPhone > On 25 Oct 2020, at 17:21, Graham Samuel via use-livecode > <use-livecode@lists.runrev.com> wrote: > > I feel stupid, but even with Sarah Reichelt’s help, there are very very > simple things I can’t do with the LC XML functions. My current problem is > this: > > I have a series of XML files which are in fact .gpx files - a collection of > GPS coordinates representing a route on the Earth’s surface. There are > thousands of files around which I can use as test data, so I don’t have to > roll my own. Taking just one of these examples, I can do the following in LC > > 1. Get the user to find the file and download it > > 2. Check it’s a .gpx file > > 3. Turn it into an LC XML data structure with an integer ID > > 4. Find out how many child nodes there are. > > Then it all goes wrong, because I don’t seem to be able to address the > individual nodes. This is obviously needed for further progress, in functions > like revXMLFirstChild and revXMLNodeContents. > > I just don’t know what format to use. Sarah’s tutorial doesn’t help because > her data structure is too simplified. > > If you’re still with me, this is what the beginning of a typical file looks > like: > >> <?xml version="1.0" encoding="UTF-8"?> >> <gpx xmlns="http://www.topografix.com/GPX/1/1"; creator="Digital Crow" >> version="1.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; >> xsi:schemaLocation="http://www.topografix.com/GPX/1/1 >> http://www.topografix.com/GPX/1/1/gpx.xsd";> >> <metadata /> >> <trk> >> <trkseg> > >> <trkpt lat="43.319729" lon="2.128369"> >> <ele>169.623637</ele> </trkpt> > >> <trkpt lat="43.319731" lon="2.128375"> >> <ele>169.744722</ele> </trkpt> > >> <trkpt lat="43.319731" lon="2.128375"> >> <ele>169.744722</ele> </trkpt> > >> <trkpt lat="43.319731" lon="2.128388"> >> <ele>169.266626</ele> </trkpt> >> > etc - there may sometimes be thousands of these “trkpt” elements. > > So, suppose I want to get the first instance of the “lon” attribute into a > local variable. How do I address the first <trk> node etc in order to do it? > I have attempted various common-sense methods, but none work. > > This must be child’s play to a lot of people, just not me. > > Hoping for some guidance. > > Graham > _______________________________________________ > use-livecode mailing list > use-livecode@lists.runrev.com > Please visit this url to subscribe, unsubscribe and manage your subscription > preferences: > http://lists.runrev.com/mailman/listinfo/use-livecode _______________________________________________ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
