All directory names in this section are relative to the SGML_BASE_DIR and SGML_EXTRA_BASE_DIR variables. This will be indicated by three leading dots in the directory names.
Location of document type definitions. Document type definitions should go into subdirectories named after the document type definitions themselves ("jade", "docbook", "html", "html/3.2", etcetera).
Location of entity collections, like the standard ISO 8879:1986 entity definitions. Entity collections should go into subdirectories with applicable names like "iso-entities-8879-1986.2".
Location of stylesheets. Stylesheets are put into subdirectories according to the naming pattern [language/dtd/variant]. Examples are "dsssl/docbook/nwalsh" and "css2/html-3.2/netscape".
Everything that doesn't fit one of the above categories.