Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Web Table Extraction, Retrieval and Augmentation: A Survey   Tables are a powerful and popular tool for organizing and manipulating data.
A vast number of tables can be found on the Web, which represents a valuable
knowledge resource. The objective of this survey is to synthesize and present
two decades of research on web tables. In particular, we organize existing
literature into six main categories of information access tasks: table
extraction, table interpretation, table search, question answering, knowledge
base augmentation, and table augmentation. For each of these tasks, we identify
and describe seminal approaches, present relevant resources, and point out
interdependencies among the different tasks.

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The categories of this paper are: nucl-th
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The categories of this paper are: ao-sci
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The categories of this paper are: chao-dyn
36
The categories of this paper are: cmp-lg
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The categories of this paper are: gr-qc
0
The categories of this paper are: hep-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: quant-ph
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The categories of this paper are: math
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The categories of this paper are: funct-an
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The categories of this paper are: hep-lat
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The categories of this paper are: nlin
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The categories of this paper are: mtrl-th
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The categories of this paper are: eess
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The categories of this paper are: alg-geom
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The categories of this paper are: acc-phys