In chemistry, the incorporation of two- and three-dimensional molecular structures into documents is of utmost importance. Currently structural formulas are supplied as graphics for print media. For hypermedia presentation, chemical MIME (Multipurpose Internet Mail Extensions) may be used to supply coordinates and allow interactive online viewing of molecular models. As an extension of HTML, CML (Chemical Markup Language) has been suggested by Peter Murray-Rust, Henry S. Rzepa and Christopher Leach (see their poster) to include 2D and 3D structural information directly in SGML (CML) documents. Likewise, diagrams or (uuencoded or PostScript) figures may be included as well as numeric data in scalar or matrix form. Currently CML is in an experimental stage, there is a prototype viewer (cmlcost) for CML or ESIS files (End System-Intermediate System, generated by an SGML parser such as sgmls or nsgmls). CML documents are not supposed to be created manually but by means of tools.