Programming a GPX file

[+imajeep]

I am writing some code in .NET to create a GPX file, and I need a little bit of help coding the document node of a GPX file. I am using the XmlDocument class and its related classes. I'm having trouble declaring the 'xmlns:xsi' and 'xsi:schemaLocation' attributes of the document (<gpx>) node. I can declare the XSI namespace, using the XmlDocument.CreateAttribute() method, but .NET ignores the prefix in the 'xsi:schemaLocation' attribute. All that gets written is 'schemaLocation', which causes the document to be invalid.

 

Does anyone have a snippet that shows how to code a GPX document node in either VB.NET or C#? Thanks for your help!

 

David Veeneman

Foresight Systems

a/k/a 'imajeep'

Edited November 10, 2007 by imajeep

[+imajeep]

I got an answer at A href="n"tp://microsoft.public.dotnet.xml">nntp://microsoft.public.dotnet.xml. The short answer is that namespace declarations aren't done explicitly. Instead, they are set by calling the SetAttribute() overload that takes a prefix and a namespace URI.

 

Here is the code to create the root node:

 

const string gpx = "http://www.topografix.com/GPX/1/1",

xsi = "http://www.w3.org/2001/XMLSchema-instance";

XmlDocument xmlDoc = new XmlDocument();

XmlElement root = xmlDoc.CreateElement("gpx", gpx);

root.SetAttribute("version", "1.1");

root.SetAttribute("creator", "ExpertGPS 2.4.2");

XmlAttribute schemaLocation = xmlDoc.CreateAttribute("xsi", "schemaLocation", xsi);

schemaLocation.Value =

@"http://www.topografix.com/GPX/1/1

http://www.topografix.com/GPX/1/1/gpx.xsd

http://www.topografix.com/GPX/gpx_style/0/2

http://www.topografix.com/GPX/gpx_style/0/2/gpx_style.xsd

http://www.topografix.com/GPX/gpx_overlay/0/3

http://www.topografix.com/GPX/gpx_overlay/...gpx_overlay.xsd

http://www.topografix.com/GPX/gpx_modified/0/1

http://www.topografix.com/GPX/gpx_modified...px_modified.xsd";

root.SetAttributeNode(schemaLocation);

xmlDoc.AppendChild(root);