Describes the property or state of the page. If the value of the tag is different from "Document", then the search engines do not index it or can use special indexing algorithms. The meta tag is intended for scaling document (used by default), rating , version , operator , formatter , creation and others. Has a narrowly focused application, to avoid misunderstandings I recommend not to use without proper understanding.
< meta name = "resource-type" content = "document" />