I usually use XML::XSH2:

open file ;
rename Heading_1 /root/H1 ;
rename Heading_2 /root/H2 ;
save :b ;
[download]

Or, more elaborate:

rename :i { s/h/Heading_/ } /root/*[xsh:match(name(),'H[12]')] ;
[download]

Note that I use an underscore instead of a space, see mirod's Re: Replacing XML Tag name with another.

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