Funding was provided by nsF grant IRI-9503109, the NSF/DARPA/NASA Dig ital Libr ary project(NSF IRI-9411306, NSF grant IRI-9220645, and ArPa grant F49620-94-1-0900. The implementations to be described were con structed with the help of a lot of free Software. Thanks. therefore are also cue to the authors and maintainerS of Apache, Sub Arctic [Hudson and Smith, 1996, Berkeley DB[Seltzer andYigit, 1991, mSQL [Hughes, 1993], CH ACO [Hendrick Son and Leland, 1994]and above all the Python programming langu age [van Rossum, 1995 A number of user tests were performed as part of this work. I am grateful to all of the people who took the time to partici pate, either on the web or in perSon here at stanford rrentlydocumentedathttp://www.apache.orgFunding was provided by NSF grant IRI-9503109, the NSF/DARPA/NASA Dig￾ital Library pro ject (NSF IRI-9411306), NSF grant IRI-9220645, and ARPA grant F49620-94-1-0900. The implementations to be described were constructed with the help of a lot of free software. Thanks, therefore, are also due to the authors and maintainers of Apache1 , SubArctic [Hudson and Smith, 1996], Berkeley DB [Seltzer and Yigit, 1991], mSQL [Hughes, 1993], CHACO [Hendrickson and Leland, 1994] and above all the Python programming language [van Rossum, 1995]. A number of user tests were performed as part of this work. I am grateful to all of the people who took the time to participate, either on the Web or in person here at Stanford. 1Currently documented at http://www.apache.org viii