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Kids and Teachers alike are still familiar with sections in their school library classified by the Dewey Decimal system. Librarians and Technology Coordinators in K-12 use it daily. If search engines supported search by explicit classifications (Dewey, Library of Congress, others), it could make use of existing taxonomies.
Add a microformat to a piece of educational content so a search engine's bot or crawler knows its educational.
Extend XML Site Maps so one can specify that a resource is "educational."