In anticipation of a world-wide deployment of an XML authoring environment for documents modeledaccording to a community-standard vocabulary, differing presentation requirements need to be ac-commodated in different installations using a single presentation architecture. Legacy applicationsand local presentation conventions guide the expectations of users to produce reports in the new en-vironment that are identical or similar to the reports they have worked with in some cases for manyyears. Only a stylesheet architecture designed for specialization and customization can accommodatesuch a diverse set of presentation expectations. The large-scale and widely-deployed Intelligence Production Environment (IPE) uses both XSLTand XSL-FO to produce both HTML and PDF renditions of an XML document authored accordingto a standardized community document model. XSLT is used to express the construction of theresult presentations from the source documents. XSL-FO is used to express the presentation semanticsfor both HTML and PDF, thus promoting fidelity between the two renderings.