Garmin GPX Extension Validation

TL;DR

I was able to get this working with xmllint by:

- Downloading the GPX, GpxExtensionsv3 and TrackPointExtensionsv1 XSDs and defining a wrapper schema to load all of them (because xmllint won't load https links and also won't load multiple schemas from the command line)

- Editing the GPX and GpxExtensionsv3 XSDs to change the latitudeType / longitudeType definitions from xsd:decimal to xsd:string, because xmllint doesn't like more than 18 decimals

I'm able to open the XSD file in a browser (Chrome or Firefox):

https:// www8 .garmin.com/xmlschemas/GpxExtensions/v3/GpxExtensionsv3 .xsd

(I split the URL up because the forum freaks out when you link to an XML file...)

But it doesn't work in xmllint (on WSL Ubuntu) -- I get the same error as you. I think the reason is that xmllint doesn't work with https urls.

If I download the file and reference it locally, then I get the following error when validating against an exported activity GPX:

[test.gpx:6: element gpx: Schemas validity error : Element '{http://www.topografix.com/GPX/1/1}gpx': No matching global declaration available for the validation root.]

Looking at xsi:schemaLocation in the exported GPX, the URL is incorrect:

xsi:schemaLocation="http://www.topografix.com/GPX/1/1 http://www.topografix.com/GPX/1/1/11.xsd"

The correct URL is: http :// www .topografix.com/GPX/1/1/gpx.xsd

Even after fixing the URL, it doesn't work, because xmllint apparently doesn't open XSD files referenced in xsi:schemaLocation.

So I downloaded gpx.xsd and created a wrapper schema. I also had to download the trackpoint extension v1 xsd (otherwise trackpoint extensions won't be validated -- invalid data will be ignored silently): https:// www8. garmin.com/xmlschemas/TrackPointExtensionv1 .xsd

gpxwrapper.xsd:

<?xml version="1.0" encoding="UTF-8"?>
<schema elementFormDefault="qualified" xmlns="http://www.w3.org/2001/XMLSchema">
    <import namespace="http://www.topografix.com/GPX/1/1" schemaLocation="gpx.xsd"/>
    <import namespace="http://www.garmin.com/xmlschemas/GpxExtensions/v3" schemaLocation="GpxExtensionsv3.xsd"/>
    <import namespace="http://www.garmin.com/xmlschemas/TrackPointExtension/v1" schemaLocation="TrackPointExtensionv1.xsd"/>
</schema>

I used this command line to validate:

xmllint --noout --schema gpxwrapper.xsd  test.gpx

Unfortunately, validation still fails because the trackpoint lat/lon attributes have 29 decimals in my exported activity GPX, but xmllint only supports 18 apparently.

https://stackoverflow.com/questions/26301369/is-this-really-not-a-valid-xsdecimal

So I changed the definition of latitudeType and longitudeType in both the Garmin GPX xsd (GpxExtensionsv3.xsd) and the Topographix xsd (gpx.xsd) to be xsd:string.

Finally my GPX file validates. As a sanity check, I changed some elements/attributes in the test GPX to be invalid, and the file fails to validate, as expected

I suggest finding a better xml linter tho.