General requirements for the soundness of metadata models

1
General requirements for the soundness of
metadata models

• Tjalling Gelsema
• Statistics Netherlands

2
Contents

• General requirements
• Completeness
• No junk
• No confusion
• The logic of classification structures
• Leisure activities
• Concluding remarks

3
General idea
4
Classification structures
5
I. Incompleteness
6
II. Junk
7
III. Confusion
8
Classification structures junk
9
Why junk is bad
10
Why confusion is bad
11
The logic ofclassification structures

• identify synonymous categories
• maintain backward compatibility

12
Adding two categories

• Reading Biking Economical
• Biking Shopping Relaxing

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But what about these

• Group synonymous with Outdoor (no confusion)
• Piano playing not backward compatible

14
Conclusion

• Avoid junk (if possible)
• Avoid confusion (if possible)
• Classification structures are Boolean algebras