RFR: 8167002: JAXP schema validator: Use HashSet instead of ArrayList for tracking XML IDs

[Lance Andersen]

This looks fine to me also


> On Sep 30, 2016, at 8:41 PM, Martin Buchholz <martinrb at google.com> wrote:
> 
> https://bugs.openjdk.java.net/browse/JDK-8167002
> http://cr.openjdk.java.net/~martin/webrevs/openjdk9/xml-id-validation-by-hash/

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