Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Fairness as a QoS Measure for Web Services   Service Oriented Architectures (SOAs) are component-based architectures,
characterized by reusability, modularization and composition, usually offered
by HTTP (web services) and often equipped with a Quality of Services (QoS)
measure. In order to guarantee the fairness property to each client requesting
a service, we propose a fair version of the (Soft) Concurrent Constraint
language to deal with the negotiation phases of the Service Level Agreement
(SLA) protocol.

12
The categories of this paper are: nucl-th
18
The categories of this paper are: econ
25
The categories of this paper are: patt-sol
35
The categories of this paper are: mtrl-th
19
The categories of this paper are: eess
30
The categories of this paper are: q-alg
37
The categories of this paper are: supr-con
16
The categories of this paper are: stat
26
The categories of this paper are: bayes-an
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The categories of this paper are: q-fin
36
The categories of this paper are: cmp-lg
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The categories of this paper are: astro-ph
28
The categories of this paper are: alg-geom
3
The categories of this paper are: physics
24
The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph