[GRASS5] [bug #3141] (grass) v.out.ascii: support for outputting attribute columns

this bug's URL: http://intevation.de/rt/webrt?serial_num=3141
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Subject: v.out.ascii: support for outputting attribute columns

see http://grass.itc.it/pipermail/grass5/2005-April/017933.html

Radim:

The possibility to export attributes should be added to v.out.ascii,
but it must be done better than in v.out.ogr. All attributes must be
selected by one query and read points using category index and keep an
array of flags if the point was printed. At the end output points
without attributes.

agreed, best solution.

option
key: columns ("where="?? "sql="??)
type: string
description: attribute columns to export
required : no
multiple: yes

cats= can be done with the above option too, right?

Hamish

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