Search for an document by seeking word matches on ALL bibliographic fields or on SPECIFIC bibliographic fields. You can specify how your search results will be sorted.
The simple search form presents a single text entry box. Enter keywords in this box (e.g., digital library) to search the author, title, and abstract fields of the bibliographic entries for all documents in the NCSTRL collection. The search returns documents whose bibliographic entries contain all the words you entered in either the author, title, type, language, archive, accession date, discovery date or abstract fields. If you wish to enter a phrase, put it in quotes.
There is a pulldown menu to specify how your search results will be grouped and
sorted .
There is a pulldown menu for either type of searching that allows you to
specify the sorting of search results. Search results can be sorted
by rank, by discovery date, by archive. If there is a "tie" (e.g.
there are many documents with the same archive), the secondary sort is by Oracle
Intermedia search rank.
There is a pulldown menu for choosing the manner in which the results are to be grouped. Search results may be grouped according to Archive and accession year.
In this you may specify the author,the title or some keywords appearing in
the abstract. The search form below the three text entry fields for
bibliographic keyword entry, has two radio buttons to specify whether the field
match specifications entered should be "anded" or "ored" together.
To
specify search criteria, enter keywords in one or more of the text entry boxes
beside the author, title and abstract labels (see the rules for bibliographic keyword
matching). A keyword may be a quoted phrase (e.g., "digital library")
to specify that the words should be contiguous.
and select the "AND" or "OR" radio button to indicate how you want the different field search specifications to be combined.
Please note that not all documents in the collection have abstracts. If you want your search request to include documents without abstracts, enter your search criteria under Title as well as Abstract.
The filters provide a means by which a user can specify some details of
the document he is seeking.
The filters are
Words that you enter in the three bibliographic keyword fields (Author, Title, Abstract) are matched to bibliographic entries according to the following rules:
They are the same as mentioned above.
A Cluster is a collection of documents all of them sharing the same value for
a particular attribute. For example all the documents in the archive type xxx,
have the same attribute of the source digital library being that of XXX. This
type of organization of documents improves the searching capabilities of the
digital library. This allows users to specify the exact type of document they
are looking for. For example a user may wisht to view documents by a specific
author which has been published in a specific archive. This can be
done by specifying the necessary filters.
Cluster information for Digital libraries
The entier document database has been
indexed along the following indices
Working of the Advanced search
When the user types in the search string and a few of the filter arguments, the search engine searches the respective indices for the matches and retrieves the "sets" of document Id of the matches for that index and then it does an intersection of these "sets" and displays its results based on type of grouping (Eg. group by Archive type) that is expected by the user.
The current OAI-NCSTRL search engine has a few limitations:
1. Browsing by cluster (i.e., a search with no keywords, just cluster values) no longer returns all members of a cluster. Only a partial list is returned. This is caused by different authority file (subject, type, language, publication date) used by data providers. Please be aware that browsing gives incomplete results.
We apologize for these limitations and we are working to resolve them by
refinng the search engine.
Need more help? Feel free to e-mail us at root@cs.odu.edu