Database search is performed using the Lucene Query Syntax, but be aware that while Lucene uses OR as the default conjunction operator, DDF uses the AND operator. So when no boolean operator is specified between search terms, AND will be used.
The available search parameters are:
au: or author: or authors:
Example: au:"Smith, Bob"
|Editor||ed: or editor: or editors:|
|Affiliation||af: or affiliation:|
|Title||ti: or title:|
|Journal title / abbreviated title / original title||jo: or journal: or journaltitle: or journal_title:|
|Abstract||ab: or abstr: or abstract:|
|Publication year||y: or year:|
|Publisher||pu: or pub: or publisher:|
|Volume||v: or vol: or volume:|
|Issue||i: or iss: or issue:|
|Page start||p: or page:|
kw: or ke: or key: or keyword: or keywords: or su: or subj: or subject:
There are no controlled keywords in the Danish National Research Database, however, searching for keywords might return highly relevant records.
Any search term is by default reduced to its elemental root in order to retrieve all forms of the term, just like applying truncation. If you search for the term test you will also retrieve hits on tests, tested, testing, tester, etc.
Truncation and wild card matching
In most cases truncation is not necessary because of the default stemming of search terms. Asterisk is used as wildcard symbol, representing any character within a word. Searching for wom*n will retrieve woman and women.
The following examples illustrate the difference between a query without truncation (query 1) and a query with truncation (query 2):
Query 1: ti:water
Retrieves hits on: water and waters (default stemming)
Query 2: ti:water*
Retrieves hits on: water, waters and waterlogged.
Search results can be ranked on various parameters. The default is “relevance”, giving a priority boost to the title data element.
To refine search results, the database offers a selection of facets, which allows for narrowing down of the various parameters.
For publications found in the database, it provides: backlinks to the research institutions' CRIS systems; links to Open Access versions of full texts; and links to publishers' editions.
Thus, access to the full texts of publications found in the database is handled by the user interfaces of the CRIS systems in which the publications were originally registered. They may offer different and differentiated access options – based on user role, affiliation, existence of deposited Open Access versions, etc.
This database does not contain digital copies of any of the publications and has no service with regard to ordering of material. For ordering, please refer to the data providers’ CRIS, a library and/or the publishers of the publications.