There are two lists which contain all keywords currently attributed to at least one of the
papers in the ERPA database:
1. In the first list you may mark one or several keywords
that the papers must contain.
- Marking is done by simply clicking with the mouse on the
respective keyword. Use the mouse and the scroll bar on the right to move up
and down the list.
- Note that you may mark more than one keyword by
clicking on as many keywords as you wish while holding the Control (CTRL)
button of your keyboard pressed down.
If you mark more than one keyword,
these are linked with the logical expression "OR" which means that papers fit
your choice if they contain at least one of the keywords marked.
- At the top of the list, there is a line of dashes ("-----").
If this line is marked, no keywords are chosen; the same is true for the
"titles", that is the words in all upper case they only serve as a
structure to the list. By default, no keywords are marked. If you have already
marked one keyword, marking the "-----" top line is the only way to "unmark"
- Note: if the line of dashes ("-----") and one or more
keywords are marked at the same time, the search-engine assumes that no
keyword was chosen.
2. Also the second list contains the same choice of
keywords and they can be marked the same way as in the first list. Again,
several keywords marked are linked with an "OR".
The second list differs,
however, from the first insofar as you may chose whether it should be linked
with the logical expression "AND NOT" (i.e. "must not contain") or with
"AND" (i.e. "must also contain"). The latter is the default option.
- Example: If you have marked keyword A in the first
list and keyword B in the second and did not alter the default option, the
search-engine will search for all papers containing A and B in their
list of keywords.
- Example: I you have marked keyword A and B in the
first list and C in the second without altering the default option, the
search-engine will search for all papers containing either A or B,
but in any case C.
- Example: Extending from the last example, if you have
chosen the option "must not contain", then the search-engine would go for all
papers with either A or B, but not containing C.
For most papers in the ERPA database a series of keywords have been
attributed. You may have a look at this list by scrolling through one of the
two keyword lists on the search form or by checking the current
keywords file (there is also a
non-structured list here).
- PLEASE NOTE:
- 1. Note that this list is
not (yet) a well structured list. It grew out of practical experience rather
than systematic elaboration. The ERPA network team is
trying hard to harmonise and to restrict the common keywords list to a useful
set of notions and to avoid different expressions for similar ideas.
- 2. Note that the list
includes some keywords not yet attributed to one of the papers in the
- 3. Note that the list
is growing slowly, but steadily over time. This means that some of the
older papers may not have been attributed a particular keyword, although it
would deserve this keyword, because at the time of keywording the
particular keyword did not yet exist in the list. Hence it would not be found
through this specific keyword search. The ERPA team, however, is constantly working together with
the authors to update older keywords.