RFR: JDK-8289948: Improve test coverage for XPath functions: Node Set Functions [v4]

[Bill Huang]

> Provided coverage for XPath node set functions. Functions include:
> - id()
> - last()
> - position()
> - count()
> - local-name()
> - namespace-uri()
> - name()

Bill Huang has updated the pull request incrementally with one additional commit since the last revision:

  Added documentation/comments and test cases using namespace.

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/9633/files
  - new: https://git.openjdk.org/jdk/pull/9633/files/2029ce13..0db77643

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=9633&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=9633&range=02-03

  Stats: 144 lines in 4 files changed: 111 ins; 0 del; 33 mod
  Patch: https://git.openjdk.org/jdk/pull/9633.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9633/head:pull/9633

PR: https://git.openjdk.org/jdk/pull/9633