Minecraft wiki entry for Experience, associated text: 1 Sources
1.1 Experience orbs
1.2 Experience amounts by source
2 Leveling up
2.1 Useful numbers
3 Score
4 Sounds
5 Data values
5.1 ID
5.2 Entity data
6 Video
7 History
7.1 Values from Java Edition Beta 1.8 to 1.3.1 (12w23a)
7.2 Values from Java Edition 1.3.1 to 1.8 (14w02a)
8 Issues
9 Trivia
10 Gallery
11 References