Is the byhand attribute value always required to generate gpx XML file ?

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C++

GPS

Hello Everyone,

Happy New Year 2021 to all of you !!

I have searched the web to collect information about gpx file format and almost all the examples are included the attribute value byHand in the header part.
Is it something always required ? Can we assign anykind of value, like the name of the tool generating the gpx file and maybe adding to it some revision number ?

<?xml version="1.0" encoding="UTF-8" standalone="no" ?>
<gpx xmlns="http://www.topografix.com/GPX/1/1" creator="byHand" version="1.1" 
    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">
 
  <wpt lat="39.921055008" lon="3.054223107">
    <ele>12.863281</ele>
    <time>2005-05-16T11:49:06Z</time>
    <name>Cala Sant Vicenç - Mallorca</name>
    <sym>City</sym>
  </wpt>
</gpx>

What I have tried:

I could not see a real reason why this is used.  Maybe I missed something.

Does somebody have an idea why this is mostly used ?

Thank you very much in advance.
Best regards.
MiQi