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What's New in PHP OpenID 2.0
============================
+This library implements both the OpenID 1 and OpenID 2 protocols. The
+API changes in this version of the library are minimal and mostly
+backwards-compatible with current RP and Server implementations. If
+you're already using this library for OpenID 1, only a few small
+changes (see Summary below) will be needed once you upgrade.
+
The big news here is compatibility with version 2.0 of the OpenID
protocol. Highlights include: