Auto created teext when opening new html-page in Expression web -

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I'm learning to use Expression Web 4.0 when creating a new HTML page, the following text is automatically created: 

  & lt ;! DOCTYPE html public "- // W3C // DTD XHTML 1.0 Transcription // N" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional DTD" & gt; & Lt; Html xmlns = "http://www.w3.org/1999/xhtml" & gt;

Is this code redundant, is it necessary (or demanded by the owners), or what?

doctype A special edition of html used to create web pages for web browsers is also responsible for triggering a particular browser rendering mode. Check it out

is standardized by the World Wide Web Consortium (W3C)

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