Go 1.22 introduced a new [for-range](https://go.dev/ref/spec#For_range)
construct that looks a tad better than the usual `for i := 0; i < N; i++`
construct. I also tool the liberty of replacing some
`for i := 0; i < len(myitemsarray); i++ { … myitemsarray[i] …}`
with `for item := range myitemsarray` when `myitemsarray` contains only pointers.
As per [OPML 2.0 specification]:
> Each sub-element of the body of the OPML document is a node of type rss or an outline element that contains nodes of type rss.
> Required attributes: type, text, xmlUrl.
[OPML 2.0 specification]: http://opml.org/spec2.opml#subscriptionLists
