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
