The GELLMU ArchiveThe files in this directory are all examples under the didactic document type that is called articleFrom early days of the project until mid 2006 the translator that converted the SGML form of an article to the (only) XML form of article automatically generated section numbers, tables of contents, and crossreferencing informationSince mid 2006, this stage of the standard pipeline has been split in two, and there are now two XML versions of article The one produced directly from SGML (with suffix .xml) is authorlevel and very nearly equivalent to original source It resides under a strict document type definition for the XML version of article that may be regarded as suitable for authors who wish to write article originally as XML source With the new standard pipeline these XML document instances qualify as standalone XML documentsThe second XML form of article (with suffix .exml) is very nearly equivalent to what was previously the only XML form of article in the production system For maximum efficiency in subsequent generation of end formats the translator producing the second XML form simultaneously produces various auxiliary files containing xet(xet) XML entity definitions (suffix .xet)Some of the entity definitions may be superfluous, but they cause no harm (There is more than one conceivable way to generate the XML version of an article.), xlb(xlb) label information (suffix .xlb), and xcn(xcn) a table of contents (suffix .xcn) as appropriateThe items (xet) and (xcn) represent included entities in the second XML version of an article and, therefore, must be present in order to produce conforming XML This means that the second XML form of an article does not qualify as a standalone XML instance The current formatters for the HTML and targets make use of item (xlb)In early 2002, motivated by CSS handling in the browser Opera6, the author began very tentatively building a CSS style sheet for browserbased rendering of the XML version of the GELLMU article document type The CSS sheet remains very much under construction, and, at best, CSS is a cruder rendering vehicle for arbitrary XML tag vocabularies than a finely honed translation to standard HTML or XHTML with appropriate use of CSS stylingIn general, there is an expectation that a web browser with XML capability will render an XML document that is accompanied by a CSS style sheet, but such browsers, as a general rule, should not be expected to handle document instances except when standaloneIn particular, the first XML form of an article is the one that should be considered most suitable for CSSstyled rendering