. This document aims at describing main issues in the area of structured multimedia documents. Documents can be modelled through four main dimensions (logical, hypermedia, spatial and temporal) and will be illustrated by the main corresponding standards (SGML/XML, HTML, CSS, DSSSL/XSL, SMIL). Building authoring tools that are capable to deal with these dimensions (and specially the temporal one) is still a great challenge. We describe some authoring applications and develop temporal aspects of documents through the analysis of new specification and authoring needs required for handling multimedia documents. Keywords: structured document, style sheet, hypermedia, multimedia document, authoring tool, XML, CSS, HyTime, SMIL 1 Introduction Electronic documents have been the scope of numerous research activities for years. These works have lead to the identification of the main characteristics attached to documents and to their modeling through several dimensions such as the logical, physi..