when to use http://schema.openid.net/contact/email and when to use http://axschema.org/contact/email in openid request.
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Unfortunately there is no standard schema for Attribute Exchange (AX). But the axschema.org seems to be the closest thing to it. To know which one to use, the best way I know of is to look for a "hint" about which schema(s) are supported in the OP's XRDS document. DotNetOpenAuth does this, for example, and has a good success rate. When the XRDS doesn't contain any of the AX schema URIs, you can send all three (yes, there are three) AX attribute URI formats to best ensure a useful response.
Andrew Arnott
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What would those "hints" in XRDS look like? – Mewp Jul 22 '10 at 12:34
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A TypeURI in the XRDS that contains any of the AX attributes the OP supports. – Andrew Arnott Jul 22 '10 at 19:44
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Nowadays, it seems the preferred AX schema url is always schema.openid.net. The axschema.org domain has been down for almost a year (not that it's needed).
Refs: Chris Messina on OpenID list and StackOverflow: Google only responds to schema.openid.net.
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Graham King
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