greenstone digital library user's guide - Index of

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54 MAKING GREENSTONE COLLECTIONS 3.4 The Collector The Collector is a facility that helps you create new collections, modify or add to existing ones, or delete collections. To do this you will be guided through a sequence of web pages which request the information that is needed. The sequence is self-explanatory: this section takes you through it. As an alternative to using the Collector, you can also build collections from the command line—the first few pages of the Developer’s Guide give a detailed walk-through of how to do this. The Collector predates the librarian interface described in Section 3.1, and for most practical purposes the librarian interface should be used instead of the Collector. Building and distributing information collections carries responsibilities that you should reflect on before you begin. There are legal issues of copyright: being able to access documents doesn’t mean you can necessarily give them to others. There are social issues: collections should respect the customs of the community out of which the documents arise. And there are ethical issues: some things simply should not be made available to others. The pen is mightier than the sword!—be sensitive to the power of information and use it wisely. To access the Collector, click the appropriate link on the digital library home page. In Greenstone, the structure of a particular collection is determined when the collection is set up. This includes such things as the format of the source documents, how they should be displayed on the screen, the source of metadata, what browsing facilities should be provided, what full-text search indexes should be provided, and how the search results should be displayed. Once the collection is in place, it is easy to add new documents to it—so long as they have the same format as the existing documents, and the same type of metadata is provided, in exactly the same way. The Collector has the following basic functions: 1. create a new collection with the same structure as an existing one; 2. create a new collection with a different structure from existing ones; 3. add new material to an existing collection; 4. modify the structure of an existing collection; 5. delete a collection; and 6. write an existing collection to a self-contained, self-installing CD- ROM. Figure 16 shows the Collector being used to create a new collection, in this case from a set of HTML files stored locally. You must first decide
Figure 16 Using the Collector to build a new collection (continued on next pages) Logging in (a) MAKING GREENSTONE COLLECTIONS 55 whether to work with an existing collection or build a new one. The former case covers options 1 and 2 above; the latter covers options 3–6. In Figure 16a, the user opts to create a new collection. Either way it is necessary to log in before proceeding. Note that in general, people use their web browser to access the collection-building facility on a remote computer, and build the collection on that server. Of course, we cannot allow arbitrary people to build collections (for reasons of propriety if nothing else), so Greenstone contains a security system which forces people who want to build collections to log in first. This allows a central system to offer a service to those wishing to build information collections and use that server to make them available to others. Alternatively, if you are running Greenstone on your own computer you can build collections locally, but it is still necessary to log
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