Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: nanopub-java: A Java Library for Nanopublications   The concept of nanopublications was first proposed about six years ago, but
it lacked openly available implementations. The library presented here is the
first one that has become an official implementation of the nanopublication
community. Its core features are stable, but it also contains unofficial and
experimental extensions: for publishing to a decentralized server network, for
defining sets of nanopublications with indexes, for informal assertions, and
for digitally signing nanopublications. Most of the features of the library can
also be accessed via an online validator interface.

17
The categories of this paper are: q-fin
15
The categories of this paper are: nucl-ex
37
The categories of this paper are: supr-con
23
The categories of this paper are: solv-int
31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
16
The categories of this paper are: stat
3
The categories of this paper are: physics
35
The categories of this paper are: mtrl-th
11
The categories of this paper are: hep-lat
13
The categories of this paper are: quant-ph
0
The categories of this paper are: hep-ph
30
The categories of this paper are: q-alg
9
The categories of this paper are: nlin
18
The categories of this paper are: econ
19
The categories of this paper are: eess