In this part of the information literacy course we are introducing databases. We will explain which types of databases are available at the University of Groningen Library and how you can use them to find scholarly literature. We will go into Google Scholar as well.
We will show three types of databases:
Further on you will find examples of the different types of databases and about the way to use them.
After studying this chapter you will understand about the different search systems that are available in the University of Groningen Library and be able to use them. You will also be able to select the relevant search systems for your specific research question.
In English the list of references at the end of a publication is sometimes called 'bibliography'. This reference list shows which publications the author used in his research. In Dutch we call this a 'literatuurlijst'.
In this information literacy course we use the word 'bibliography' for something else. A bibliography or 'bibliographic database' is a database that is used for searching publications. It contains tens of thousands of descriptions of publications and has refined search facilities.
You won't get confused though, because there is such a large difference in size. A reference list contains a few hundred titles at most, while a bibliographic database can contain millions. When your teacher wants you to compile a bibliography, he/she is referring to the reference list. When you search for literature you use a bibliographic database.
Library databases contain information about publications, and sometimes also the full-text of publications. A database has a record for every publication. This record has separate fields for each element of the description. Common fields are:
All the above elements are used for the identification of the publication.
Bibliographic databases in particular have extra elements which describe the subject of the publication.
A bibliographic database is a database with references to literature. Like library catalogues they contain descriptions of publications. Bibliographic databases are designed as a tool to find scholarly literature.
Their content is selected with this purpose in mind. They are usually specialised in a specific field of study. They try to cover the most important journals in their fields. Bibliographic databases often publish the lists of journals that are covered on their website. The public can see which scholarly journals are covered by a bibliographic database.
One of the most important bibliographic databases for Archaeology is Zenon DAI. The Library also has other bibliographic databases that can be very useful to students of Archaeology. They are listed further on in this chapter.
Bibliographies have excellent search facilities and are the best tool for finding publications about a subject with precision.
When you do a basic search the database searches the complete records. In the ADVANCED search you can limit your search to specific fields. Limiting your search to a specific field gives more precise results.
In the next chapter you will be introduced to a few specific databases for archaeology.
What is 'precision' in literature research? When you search for publications about a topic and you find 10 results, and it turns out that all 10 publications are exactly right for the topic you searched for, then you have a precision of 100%. That is extremely high and not realistic. Usually a considerable part of your results is not quite what you want. SmartCat for instance is not scoring high on precision. Bibliographic databases score better.
Bibliographies use controlled vocabulary. This means that they work with a fixed set of subject terms. When descriptions of publications are added to a bibliographic database an indexer (a person who is familiar with the field and with the terminology of the database) reads the publication and tags the description with useful subject terms. The indexer decides which subjects are important enough to be tagged. The indexer uses the standardized terminology (= controlled terminology) of the bibliography.
Controlled terminology has many advantages in searching. When you perform a search with an index term in the subject index you will only retrieve publications where the indexer decided that the subject was important in the publication. Controlled terminology reduces NOISE, it reduces the number of non-relevant hits.
Another important advantage: controlled terminology often searches in a language other than just the language of the controlled language. E.g. subject term "city walls" finds titles about "city walls", "Stadtmauern", "murs de la ville" or "murallas".
Bibliographic databases use controlled terminology. Full-text journal databases and Google Scholar don't use controlled terminology. When you search these you are searching with keywords; natural language terms that you choose yourself.
If you want to use the controlled vocabulary of the database in your search, you first have to know which ones they are. The best way to find them is:
Most bibliographic databases have a controlled list of the subject terms they use: a thesaurus. You can browse the thesaurus to find the subject terms.