Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Status of the Polarized Parton Densities   A survey is given on the present knowledge of the polarized parton
distribution functions. We give an outlook for further developments desired
both on the theoretical as well on the experimental side to complete the
understanding of the spin--structure of nucleons in the future.

16
The categories of this paper are: stat
29
The categories of this paper are: funct-an
26
The categories of this paper are: bayes-an
28
The categories of this paper are: alg-geom
13
The categories of this paper are: quant-ph
11
The categories of this paper are: hep-lat
25
The categories of this paper are: patt-sol
21
The categories of this paper are: adap-org
7
The categories of this paper are: hep-th
18
The categories of this paper are: econ
15
The categories of this paper are: nucl-ex
20
The categories of this paper are: acc-phys
27
The categories of this paper are: comp-gas
1
The categories of this paper are: cs
31
The categories of this paper are: ao-sci
2
The categories of this paper are: math