Prefix format reserved for internal use

[tkrajina]

Example XML (from @jedie in #115 (comment)):

<?xml version="1.0" encoding="UTF-8"?>
<gpx creator="Garmin Connect" version="1.1"
  xsi:schemaLocation="http://www.topografix.com/GPX/1/1 http://www.topografix.com/GPX/11.xsd"
  xmlns:ns3="http://www.garmin.com/xmlschemas/TrackPointExtension/v1"
  xmlns="http://www.topografix.com/GPX/1/1"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ns2="http://www.garmin.com/xmlschemas/GpxExtensions/v3">
  <metadata>
    <link href="connect.garmin.com">
      <text>Garmin Connect</text>
    </link>
    <time>2018-02-21T14:30:50.000Z</time>
  </metadata>
  <trk>
    <name>Foo Bar</name>
    <type>running</type>
    <trkseg>
      <trkpt lat="51.43788929097354412078857421875" lon="6.617012657225131988525390625">
        <ele>23.6000003814697265625</ele>
        <time>2018-02-21T14:30:50.000Z</time>
        <extensions>
          <ns3:TrackPointExtension>
            <ns3:hr>125</ns3:hr>
            <ns3:cad>75</ns3:cad>
          </ns3:TrackPointExtension>
        </extensions>
      </trkpt>
      <trkpt lat="51.43786800093948841094970703125" lon="6.6170061193406581878662109375">
        <ele>23.6000003814697265625</ele>
        <time>2018-02-21T14:30:51.000Z</time>
        <extensions>
          <ns3:TrackPointExtension>
            <ns3:hr>123</ns3:hr>
            <ns3:cad>75</ns3:cad>
          </ns3:TrackPointExtension>
        </extensions>
      </trkpt>
      <trkpt lat="51.4378472976386547088623046875" lon="6.61700570024549961090087890625">
        <ele>23.799999237060546875</ele>
        <time>2018-02-21T14:30:52.000Z</time>
        <extensions>
          <ns3:TrackPointExtension>
            <ns3:hr>124</ns3:hr>
            <ns3:cad>75</ns3:cad>
          </ns3:TrackPointExtension>
        </extensions>
      </trkpt>
    </trkseg>
  </trk>
</gpx>

I get this:

Traceback (most recent call last):
  File "test.py", line 19, in <module>
    gpx_parser.parse()
  File "gpxpy/gpxpy/parser.py", line 97, in parse
    mod_etree.register_namespace(prefix, URI.strip('"'))
  File "src/lxml/etree.pyx", line 184, in lxml.etree.register_namespace
ValueError: Prefix format reserved for internal use

[tkrajina]

@jedie I see. I pushed now a temporary branch in ns-namespace with a hotfix that should fix it, but it needs more testing.

[jedie]

It works here, thanks!

[jedie]

@tkrajina Question: Is it possible to the the values by name? e.g.: point.extensions.get("hr")

[tkrajina]

OK, so this is merged in master.

@jedie Unfortunately point.extensions.get("hr") isn't possible yet. I was thinking to create an abstraction to simplify handling of extensions (and it should definitely be part of one of 1.3.x releases), but I'm not yet sure how to implement it.

[jedie]

I created #119 for point.extensions.get("hr") ;)