OAI-NCSTRL Search TIPS
Limitations Of OAI-NCSTRL Search Service
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.
Help on Searching
The top of the 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 OAI-NCSTRL collection. The search returns documents whose bibliographic entries contain all the words you entered in either the author, title, type, language,,archive,subject, 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 accession
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.
Grouping of results
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, accession year, ,subject.
Words that you enter in the three bibliographic keyword fields (Author, Title, Abstract) are matched to bibliographic entries according to the following rules:
Rules for advanced search
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.
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.
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
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.
Need more help? Feel free to e-mail us at firstname.lastname@example.org