Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The evolution of the parametric models of drawings (modules) in the
  enterprises reconstruction CAD system   Progressing methods of drawings creating automation is discussed on the basis
of so-called modules containing parametric representation of a part of the
drawing and the geometrical elements. The stages of evolution of modular
technology of automation of engineering are describing alternatives of applying
of moduluss for simple association of elements of the drawing without
parametric representation with an opportunity of its commenting, for graphic
symbols creating in the schemas of automation and drawings of pipelines, for
storage of the specific properties of elements, for development of the
specialized parts of the project: the axonometric schemas, profiles of outboard
pipe networks etc.

20
The categories of this paper are: acc-phys
14
The categories of this paper are: math-ph
15
The categories of this paper are: nucl-ex
33
The categories of this paper are: plasm-ph
22
The categories of this paper are: chao-dyn
30
The categories of this paper are: q-alg
3
The categories of this paper are: physics
13
The categories of this paper are: quant-ph
6
The categories of this paper are: astro-ph
18
The categories of this paper are: econ
7
The categories of this paper are: hep-th
26
The categories of this paper are: bayes-an
5
The categories of this paper are: gr-qc
12
The categories of this paper are: nucl-th
8
The categories of this paper are: hep-ex
35
The categories of this paper are: mtrl-th