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  2. Ebook - Wikipedia

    en.wikipedia.org/wiki/Ebook

    Focused on portability, Open eBook as defined required subsets of XHTML and CSS; a set of multimedia formats (others could be used, but there must also be a fallback in one of the required formats), and an XML schema for a "manifest", to list the components of a given e-book, identify a table of contents, cover art, and so on.

  3. Empty string - Wikipedia

    en.wikipedia.org/wiki/Empty_string

    Formal theory. Formally, a string is a finite, ordered sequence of characters such as letters, digits or spaces. The empty string is the special case where the sequence has length zero, so there are no symbols in the string.