How to check a node value against a set?

[jinfengnarvar]

Input xml:

<root>
  <a>
    <b>10</b>
    <c>ten</b>
  </a>
  <a>
    <b>20</b>
    <c>twenty</b>
  </a>
</root>

Desired XPATH:

/root/a[b = ('10', '15')]/c

But right now have to:

/root/a[b = '10' or b = '15']/c

Or am I missing something?

[jf-tech]

@zhengchun with matches added, this can be worked around like the following:

/root/a[matches(b, '^(10|15)$')]/c

You can close the issue if you agree with this assessment.

[zhengchun]

#58