RFR: 7419: Update XML parsing

[Marcus Hirt]

"Backport." Prepping 8.1.1 release.

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Commit messages:
 - 7419: Update XML parsing

Changes: https://git.openjdk.java.net/jmc/pull/328/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jmc&pr=328&range=00
  Issue: https://bugs.openjdk.java.net/browse/JMC-7419
  Stats: 10 lines in 1 file changed: 10 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jmc/pull/328.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/328/head:pull/328

PR: https://git.openjdk.java.net/jmc/pull/328