RFR: 8289511: Axes: child [v3]

[Joe Wang]

On Thu, 14 Jul 2022 20:52:18 GMT, Bill Huang <duke at openjdk.org> wrote:

>> This is a subtask of [JDK-8286091](https://bugs.openjdk.org/browse/JDK-8286091) which is aiming to improve XPath expression test coverage. The goal of this subtask is validating the XPath child axis specifier in various ways.
>
> Bill Huang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Renamed XPahtExpChildTest.java and moved NPE test cases from invalid test case to zero children test case.

Thanks for the update. The update looks good. One more comment below.

test/jaxp/javax/xml/jaxp/unittest/xpath/XPathExpChildTest.java line 99:

> 97:                 // position
> 98:                 {"/store/child::book[position()=1]/author", AUTHOR_1},
> 99:                 {"/store/child::book[last()]/author", AUTHOR_2},

If the intention is to test the last() function, it would be good to have more books than 2 (e.g. at least 3). But if the focus is on Axes: child, plus functions will be tested in the other subtask, I'm ok if you don't want to make further changes.

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PR: https://git.openjdk.org/jdk/pull/9484