. We consider assembling documents using, as a source, a digital library containing SGML documents. The assembly process contains two parts: 1) ønding interesting fragments, and 2) constructing a coherent document. We present a general document assembly framework. First, we describe a system for tailoring control engineering textbooks. Its assembling facilities are rather restricted but, on the other hand, the quality of documents produced is high. Second, we address the problem of øltering and combining interesting information from a large heterogeneous document collection. The methods presented ooeer various ways to ønd the interesting document fragments. Moreover, the elements found in the fragments are mapped to generic elements, like sections, paragraph containers, paragraphs and strings, which have known semantics. Hence, even arbitrary compositions can be formatted and printed. 1 Introduction In an on-going research and development project called Structured and Intelligent Docu..