An atom of information, for example a letter or a digit.
            Graphic characters have associated glyphs, whereas
            control characters have associated processing semantics.

    character encoding
    scheme
            A function whose domain is the set of sequences of
            octets, and whose range is the set of sequences of
            characters from a character repertoire; that is, a
            sequence of octets and a character encoding scheme
            determines a sequence of characters.

    character repertoire
            A finite set of characters; e.g. the range of a coded
            character set.

    code position
            An integer. A coded character set and a code position
            from its domain determine a character.

    coded character set
            A function whose domain is a subset of the integers and
            whose range is a character repertoire. That is, for some
            set of integers (usually of the form {0, 1, 2, ..., N}
            ), a coded character set and an integer in that set
            determine a character. Conversely, a character and a
            coded character set determine the character's code
            position (or, in rare cases, a few code positions).

    conforming HTML user
    agent
            A user agent that conforms to this specification in its
            processing of the Internet Media Type `text/html'.





 
RFC 1866            Hypertext Markup Language - 2.0        November 1995


    data character
            Characters other than markup, which make up the content
            of elements.

    document character set
            a coded character set whose range includes all
            characters used in a document. Every SGML document has
            exactly one document character set. Numeric character
            references are resolved via the document character set.

    DTD
            document type definition. Rules that apply SGML to the
            markup of documents of a particular type, including a
            set of element and entity declarations. [SGML]

    element
            A component of the hierarchical structure defined by a
            document type definition; it is identified in a document
            instance by descriptive markup, usually a start-tag and
            end-tag. [SGML]

    end-tag
            Descriptive markup that identifies the end of an
            element. [SGML]

    entity
            data with an associated notation or interpretation; for
            example, a sequence of octets associated with an
            Internet Media Type. [SGML]

    fragment identifier
            the portion of an HREF attribute value following the `#'
            character which modifies the presentation of the
            destination of a hyperlink.

    form data set
            a sequence of name/value pairs; the names are given by
            an HTML document and the values are given by a user.

    HTML document
            An SGML document conforming to this document type
            definition.

    hyperlink
            a relationship between two anchors, called the head and
            the tail. The link goes from the tail to the head. The
            head and tail are also known as destination and source,
            respectively.




 
RFC 1866            Hypertext Markup Language - 2.0        November 1995


    markup
            Syntactically delimited characters added to the data of