How is data stored on a CardDav server?

I wanted to ask a question about server data. I am new to server programming, but I have to l开发者_开发技巧earn about the CardDav server (CardDav is developed by the WebDav).

I only know the CardDav server is used to hold the address book data, but what form of the data does the server actually hold (e.g. .CSV or .txt)? Can anyone help me? Thank you very much.

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The format on the server is up to the server. The format on the wire is vCard (RFC 2426, to be updated soonish).

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The file format used is vCard; the wikipedia entry contains a basic explanation of the file format: http://en.wikipedia.org/wiki/VCard

For the gory details, take a look at RFC2426: https://www.rfc-editor.org/rfc/rfc2426