Deep Web - Deep Resources

Deep Resources

Deep Web resources may be classified into one or more of the following categories:

  • Dynamic content: dynamic pages which are returned in response to a submitted query or accessed only through a form, especially if open-domain input elements (such as text fields) are used; such fields are hard to navigate without domain knowledge.
  • Unlinked content: pages which are not linked to by other pages, which may prevent Web crawling programs from accessing the content. This content is referred to as pages without backlinks (or inlinks).
  • Private Web: sites that require registration and login (password-protected resources).
  • Contextual Web: pages with content varying for different access contexts (e.g., ranges of client IP addresses or previous navigation sequence).
  • Limited access content: sites that limit access to their pages in a technical way (e.g., using the Robots Exclusion Standard, CAPTCHAs, or no-cache Pragma HTTP headers which prohibit search engines from browsing them and creating cached copies).
  • Scripted content: pages that are only accessible through links produced by JavaScript as well as content dynamically downloaded from Web servers via Flash or Ajax solutions.
  • Non-HTML/text content: textual content encoded in multimedia (image or video) files or specific file formats not handled by search engines.
  • Text content using the Gopher protocol and files hosted on FTP that are not indexed by most search engines. Engines such as Google do not index pages outside of HTTP or HTTPS.

Read more about this topic:  Deep Web

Famous quotes containing the words deep and/or resources:

    “In love’s deep womb our fears are held;
    there God’s rich tears are sown
    and bring to birth, in hope new-born,
    the strength to journey on.”
    —Rob Johns (20th century)

    “Everywhere we are told that our human resources are all to be used, that our civilization itself means the uses of everything it has—the inventions, the histories, every scrap of fact. But there is one kind of knowledge—infinitely precious, time- resistant more than monuments, here to be passed between the generations in any way it may be: never to be used. And that is poetry.”
    —Muriel Rukeyser (1913–1980)