[aprssig] Live Telemetry Data Through a Simple Web Page

Brad McConahay brad at n8qq.com
Sun Apr 24 18:59:28 EDT 2005


XSLT is definitely the XML way to get APRS data into an HTML document.  It's
definitely the way of the future, and arguably the best way overall.

But the script described by Steve targets people who know enough HTML to put
together a page, and nothing more.  (maybe described as end-users, as
opposed to developers/programmers)  This way there's no need for them to
learn XML, XSLT, perl, or anything else, in order to create their own
dynamic page.  They can just put together a quick page in an HTML editor (or
by hand), paste in some variables, and send the URL through this script ...

But, your experiment demonstrates another excellent reason to have the data
available in XML format for developers right now, and eventually end-users

Brad N8QQ
-----Original Message-----
From: aprssig-bounces at lists.tapr.org [mailto:aprssig-bounces at lists.tapr.org]
On Behalf Of Arne Stahre
Sent: Sunday, April 24, 2005 8:55 AM
To: TAPR APRS Mailing List
Subject: Re: [aprssig] Live Telemetry Data Through a Simple Web Page

  I'm not quite sure what you are trying to do, but if you want to 
create HTML from one or more XML files you should look into XSLT.

  As a little try I made a very simple XML file (4 lines) on my server 
and also a XSL file (30 lines) for the transformation. This 
transformation loads additional XML from n8qq.com and extracts the 
fields I want and creates the HTML document. The nice thing is that this 
is done in the browser (Mozilla) - in theory! There is a security thing 
here. Mozilla does not allow the loading of the XML/XSL from different 

  However, this can be done in Perl using XML::LibXML and XML::LibXSLT. 
The transformation code in Perl should be about 10 lines. The XSLT 
files, though, are larger - XSLT is verbose, but powerful.

  73 de SM6VYF/Arne

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