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The property map consists of a set of 'property' entries, each of which specifies how to handle a particular property of the model on import and on export. for our Permission kind, the bulkloader has identified 4 properties, plus the __key__ pseudo-property. Each has an 'external_name', and optional import and export transforms, which specify how to translate between the App Engine datastore representation and an external representation.

All we had to do here was to remove some of the boilerplate and the extraneous invite_nonce entry, and fill in the kind names for the two reference properties, and we're sorted.

we didn't have to write a single line of Python code, or set up an app.yaml, or anything else Python-specific in order to achieve it! Further, the bulkloader took care of generating a mostly-finished configuration file for us, in a format that ensures the data we download can be re-uploaded again without loss of fidelity.

Once you've enabled OpenID authentication for your app, a few things change: URLs generated by create_login_url without a federated_identity parameter specified will redirect to the OpenID login page for Google Accounts. URLs that are protected by "login: required" in app.yaml or web.xml will result in a redirect to the path "/_ah/login_required", with a "continue" parameter of the page originally fetched. This allows you to provide your own openid login page. URLs generated by create_login_url with a federated_identity provider will redirect to the specified provider.

many users, when asked for their "openid URL" will simply look at you in puzzlement. What we need is a solution that avoids the need for most users to enter their URL themselves, while still allowing savvy users to do just that. Fortunately, there are a number of such solutions. One of them is clickpass. After signing in there and setting up an entry for your site, they'll provide you with code for a button that you can embed in your login page, and which allows users to choose from a number of well-known identity providers, including Hotmail, Yahoo!, Google, and Facebook, as well as entering their own URL.