Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: XString: XML as a String   Extensible markup language (XML) is a technology that has been much hyped, so
that XML has become an industry buzzword. Behind the hype is a powerful
technology for data representation in a platform independent manner. As a text
document, however, XML suffers from being too bloated, and requires an XML
parser to access and manipulate it. XString is an encoding method for XML, in
essence, a markup language's markup language. XString gives the benefit of
compressing XML, and allows for easy manipulation and processing of XML source
as a very long string.

13
The categories of this paper are: quant-ph
16
The categories of this paper are: stat
0
The categories of this paper are: hep-ph
30
The categories of this paper are: q-alg
18
The categories of this paper are: econ
9
The categories of this paper are: nlin
6
The categories of this paper are: astro-ph
25
The categories of this paper are: patt-sol
8
The categories of this paper are: hep-ex
31
The categories of this paper are: ao-sci
34
The categories of this paper are: chem-ph
32
The categories of this paper are: atom-ph
28
The categories of this paper are: alg-geom
17
The categories of this paper are: q-fin
33
The categories of this paper are: plasm-ph
11
The categories of this paper are: hep-lat