Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: What is an Ontology?   In the knowledge engineering community "ontology" is usually defined in the
tradition of Gruber as an "explicit specification of a conceptualization".
Several variations of this definition exist. In the paper we argue that (with
one notable exception) these definitions are of no explanatory value, because
they violate one of the basic rules for good definitions: The defining
statement (the definiens) should be clearer than the term that is defined (the
definiendum). In the paper we propose a different definition of "ontology" and
discuss how it helps to explain various phenomena: the ability of ontologies to
change, the role of the choice of vocabulary, the significance of annotations,
the possibility of collaborative ontology development, and the relationship
between ontological conceptualism and ontological realism.

28
The categories of this paper are: alg-geom
14
The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
16
The categories of this paper are: stat
19
The categories of this paper are: eess
35
The categories of this paper are: mtrl-th
25
The categories of this paper are: patt-sol
27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
22
The categories of this paper are: chao-dyn
6
The categories of this paper are: astro-ph
30
The categories of this paper are: q-alg
13
The categories of this paper are: quant-ph
9
The categories of this paper are: nlin
18
The categories of this paper are: econ
4
The categories of this paper are: cond-mat