RFR: 7419: Update XML parsing [v2]

[Marcus Hirt]

On Tue, 12 Oct 2021 19:50:09 GMT, Evgeny Astigeevich <duke at openjdk.java.net> wrote:

>> This patch fixes [JMC-7419](https://bugs.openjdk.java.net/browse/JMC-7419).
>> Testing: `man verify`
>
> Evgeny Astigeevich has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fixed formatting of the new code

Marked as reviewed by hirt (Lead).

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PR: https://git.openjdk.java.net/jmc/pull/320