1. Dart
2. dart:html
3. XPathResult
4. numberValue property

XPathResult class

1. Properties
2. booleanValue
3. invalidIteratorState
4. numberValue
5. resultType
6. singleNodeValue
7. snapshotLength
8. stringValue
9. hashCode
10. runtimeType
11. Methods
12. iterateNext
13. snapshotItem
14. noSuchMethod
15. toString
16. Operators
17. operator ==
18. Constants
19. ANY_TYPE
20. ANY_UNORDERED_NODE_TYPE
21. BOOLEAN_TYPE
22. FIRST_ORDERED_NODE_TYPE
23. NUMBER_TYPE
24. ORDERED_NODE_ITERATOR_TYPE
25. ORDERED_NODE_SNAPSHOT_TYPE
26. STRING_TYPE
27. UNORDERED_NODE_ITERATOR_TYPE
28. UNORDERED_NODE_SNAPSHOT_TYPE

num get numberValue native;