Navigational Map Nav Reference 2.5 

2.5 Document Type Declaration

The second line is the Document Type Declaration--

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "">

This is the DTD used for XHTML 1.1. In XHTML 1.1, there is only the Strict version, and no frames or deprecated code.

This sets the level of compliancy with W3C recommendations. This is the only place that upper case letters are used in the code-- all the rest is lower case.

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