google cloud datastore - App Engine - why are there PhoneNumber, Link, Rating etc classes? -

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I have not found any reason for the existence of some of the app engine classes, including a phone number, a link, postal post, A geopit, a rating etc. Why are they given special treatment? They do not have any smart - eg Geo Search I know that the link has more space than the string property, but the rest?

See:

Those types of 'semantic' types are those with python APIs The Java APIs for similarity are present. In Python APIs, they define special behaviors in relation to the .to_xml () method - for example, a PhoneNumberProperty issues this way:

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