Halo - bibliography at the 10th Conference 'Color and Light in Nature'
from 16th to 20th of June 2010 at St. Mary's College of Maryland

Why was it developed?
It has been shown that the search and find of specific articles about atmospheric halo phenomena is very time consuming.
The following problems occur here:
•   Different terms used for the elements of the class of atmospheric halo phenomena in the past.
In Romance, Gallo-Romance and Anglo-Saxon literature was used the term halo in previous centuries to
distinguish between halo and Corona. The current meaning of the term halo was gradually taken around
the year 1901 in the German language area.
•   The term halo is used in several scientific disciplines and is emerging also in the language of daily life.
The term halo is used, among other things, in astrophysics, nuclear physics and medicine.
There is also a novel called Halo and a computer game for the X-Box.
•   Articles are in different journals and newspapers.
These are mainly astronomical, meteorological, physical and popular journals and all newspapers.
•   Observer reports are often inadequate or not entitled.
Many observer reports are often grouped together and under the column "Kurz berichtet",
"Notes and Queries," "Letters to the Editor" and so on, published.
The networking of digital media to make literature searches more convenient, but not necessarily easier. In addition to the above-mentioned problems will be joined by the following.
•   The growing semantic scattering of the term "Halo" leads inevitably to an increase of search results.
•   The poor quality of the original documents is a problem for the digitization.
The quality of many original historical documents is due to corrosion of paper so bad that the
Optical Character Recognition (OCR) is reaching its limits.
•   Documents that were digitized with older procedures are difficult to find on the Internet.
These documents are not adequately referenced in metadata, so that by the conventional search engines can not be found.
These documents are hidden in the Deep Web and can be found only by special inquiry.

When the work began on this project, I expected a maximum number of 6000 entries. But in 2009, approximately 1300 new entries have been added. According to new estimates, I must assume a maximum number of 15,000 entries. From this data set results in the need to develop the halo bibliography as a database. In the next five years are planned following extensions of the bibliography:
•   Database (MySQL)
•   Multilingual input and output (german, english, french and spanish)
•   Crosspresentation (input and output for mobile devices, mobile Web.),
next ten years:
•   Structuring of data for the semantic Web.
(The goal is to develop a semantic data structure that allows full automatic processing.)