There is a technology, which is very old, named URL rewrite.

It basically allows to receive a http request for:
https://www.ibm.com/support/knowledgecenter/en/SSLTBW_2.1.0/com.ibm.zos.v2r1.ieaa700/GETMAIN_Execute_form.htm

and process it as:
https://www.ibm.com/support/knowledgecenter/en/SSLTBW_2.3.0/com.ibm.zos.v2r3.ieaa700/GETMAIN_Execute_form.htm

In the web server configuration you could use variables for the rewrite.

One could ask, why IBM does not use this technology? Its probably OLD IT style?!

Furthermore, for future IBM could replace fixed version numbers in the URL as 
something fixed and let google index an URL like this:
https://www.ibm.com/support/knowledgecenter/en/SSLTBW_recent/com.ibm.zos.recent.ieaa700/GETMAIN_Execute_form.htm

And use URL rewrite to replace the recent with the appropriate values, so lets 
say for the next couple of releases - until KC is "improved" again and new link 
structures are used - the URLs remain unchanged.

?!
Denis.

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