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Later, HTML was reformulated (version 2.0) to be more of an SGML application; however, the HTML markup language has many legacy- and exception-handling features that differ from SGML's requirements. HTML 4 is an SGML application that fully conforms to ISO 8879 – SGML. [14]
One of the most noticeable differences between HTML and XHTML is the rule that all tags must be closed: empty HTML tags such as <br> must either be closed with a regular end-tag, or replaced by a special form: <br /> (the space before the '/' on the end tag is optional, but frequently used because it enables some pre-XML Web browsers, and SGML ...
HTML 4 is an SGML application conforming to ISO 8879 – SGML. [20] April 24, 1998 HTML 4.0 [21] was reissued with minor edits without incrementing the version number. December 24, 1999 HTML 4.01 [22] was published as a W3C Recommendation. It offers the same three variations as HTML 4.0 and its last errata [23] were published on May 12, 2001 ...
SGML / XML: Tag Yes Yes [7] Yes Encoded Archival Description (EAD) Finding aids: XML: Tag Yes No Extensible HyperText Markup Language (XHTML) Hypertext documents XML: Tag Yes Yes [8] Yes FictionBook: Multi-purpose XML: Tag Yes Yes Yes Halibut: Technical documents Control code Yes Yes Yes HyperText Markup Language (HTML) Hypertext documents SGML ...
There are various differences between XHTML and HTML. The Document Object Model (DOM) is a tree structure that represents the page internally in applications, and XHTML and HTML are two different ways of representing that in markup. Both are less expressive than the DOM – for example, "--" may be placed in comments in the DOM, but cannot be ...
In SGML, HTML and XML documents, the logical constructs known as character data and attribute values consist of sequences of characters, in which each character can manifest directly (representing itself), or can be represented by a series of characters called a character reference, of which there are two types: a numeric character reference and a character entity reference.
HTML that has been written to conform to both the HTML and XHTML specifications and therefore produces the same DOM tree whether parsed as HTML or XML is known as polyglot markup. [124] There is no DTD for XHTML5. [125]
Standard Generalized Markup Language (SGML) – a standard pattern for markup languages to which HTML and DocBook adhere. Extensible Markup Language (XML) – a newer standard pattern for markup languages; a restricted form of SGML that is intended to be compatible with it.