Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: AstroCloud, a Cyber-Infrastructure for Astronomy Research: Data Access
  and Interoperability   Data access and interoperability module connects the observation proposals,
data, virtual machines and software. According to the unique identifier of PI
(principal investigator), an email address or an internal ID, data can be
collected by PI's proposals, or by the search interfaces, e.g. conesearch.
Files associated with the searched results could be easily transported to cloud
storages, including the storage with virtual machines, or several commercial
platforms like Dropbox. Benefitted from the standards of IVOA (International
Observatories Alliance), VOTable formatted searching result could be sent to
kinds of VO software. Latter endeavor will try to integrate more data and
connect archives and some other astronomical resources.

20
The categories of this paper are: acc-phys
32
The categories of this paper are: atom-ph
28
The categories of this paper are: alg-geom
34
The categories of this paper are: chem-ph
5
The categories of this paper are: gr-qc
14
The categories of this paper are: math-ph
10
The categories of this paper are: q-bio
36
The categories of this paper are: cmp-lg
13
The categories of this paper are: quant-ph
30
The categories of this paper are: q-alg
37
The categories of this paper are: supr-con
1
The categories of this paper are: cs
17
The categories of this paper are: q-fin
0
The categories of this paper are: hep-ph
9
The categories of this paper are: nlin
24
The categories of this paper are: dg-ga