Intern:Keyword

Following is an instruction for the usage of technical keywords (16.11.2004):


 * 1) Technical keywords should be used to produce non-ambiguous selections of records. E.g. you must define a technical keyword @IMAGES for the project IMAGES, because the scope of the term images is ambiguous and therefore it is likely that you will not get an exclusive selection of records for that project.
 * 2) Characters to be used are: {A-Z,a-z,0-9} (not allowed are {-,_, ,} all special characters and umlauts etc.)
 * 3) The first character is @.
 * 4) The first character after the @ character must not be a cipher.
 * 5) Do not define keywords having only meaningless or general terms that could be used also for another context.
 * 6) Put the general terms in front, followed by more specialized terms.
 * 7) Inner capitels (Binnenkapitele) could be used for better readability of composites.

Examples: @JGOFS, @JGOFSAustralia, @SummerSchoolBremen2003, @Zhao2004

Additional technical keywords,; (a) not visible, b) for internal use only): @EventXXX, @ProjectXXX, @AuthorXXX, @PiXXX, @datasetXXX, paramXXX (XXX=ID of related table).
 * 1) ) all queries including those for technical keywords are not case sensitive. So, using capital letter, inner capitels etc. is only for our internal work with these keywords. But technical keywords are case sensitive once defined, so please do not define a tecnical keyword again with another spelling!!!!! This is important for Sets on OAI and the Portals.
 * 2) ) The @Ref… keywords are reserved for usage by the PANGAEA system. It is an implicite mechanism that links references and data sets through these keywords.

Examples:
 * All data sets of PI Hannes Grobe (ID=9) => @pi9
 * All data sets of project IMAGES (ID=12) => @project12
 * All data sets of the reference with the ID=12345 => @ref12345