google app engine - Datastore Category vs. String: what is the difference? -

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By viewing the category it appears that it is basically a string I see in view of any advantage of using the range on the string I'm unsuccessful.
What is the difference, and why should I use the category instead of the string?

If you call entity.to_xml () , then a The range will come back as one.

Beyond that, it's just a string.


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