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Hash::MultiKey provides hashes that accept arrayrefs of strings as keys.

Hash::NoRef is a Perl module to create HASH that store values without increase the reference count (weak references). This can be used to store objects but without interfere in the DESTROY mechanism, since the reference in this HASH won't count.

Geo::JSON converts to and from geojson using Perl objects. GeoJSON objects represent various geographical positions - points, lines, polygons, etc. Currently supports 2 or 3 dimensions (longitude, latitude, altitude). Further dimensions in positions are ignored for calculations and comparisons, but will be read-from and written-to.

The Geo::ShapeFile module reads ESRI ShapeFiles containing GIS mapping data, it has support for shp (shape), shx (shape index), and dbf (data base) formats.

Smart hashes merging

The Getargs::Long module allows usage of named parameters in function calls, along with optional argument type-checking. It provides an easy way to get at the parameters within the routine, and yields concise descriptions for the common cases of all-mandatory and all-optional parameter lists. Seamus Venasse <svenasse@polaris.ca>

This module implements hashes that support "defaults". That is you may specify several more hashes in which the data will be looked up in case it is not found in the current hash.

This is yet another Getopt related module. Getopt::Compact is geared towards compactly and yet quite powerfully describing an option syntax. Options can be parsed, returned as a hashref of values, and/or displayed as a usage string or within the script POD.

Hook::LexWrap allows you to install a pre- or post-wrapper (or both) around an existing subroutine.

Getopt::Tabular is a Perl 5 module for table-driven argument parsing, vaguely inspired by John Ousterhout's Tk_ParseArgv.