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The name attribute on anchors, for instance, is now replaced by the id attribute. And instead of three different doctypes, there is only one: not transitional, strict or frameset but just XHTML 1.1.
The purpose of the change is making XHTML documents that will be portable across many kinds of devices.
Introduction to XHTML 1.1 [w3.org]
Changes from XHTML 1.0 [w3.org]