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NAME Data::Domain - Data description and validation DESCRIPTION A data domain is a description of a set of values, either scalar or structured (arrays or hashes). The description can include many constraints, like minimal or maximal values, regular expressions, required fields, forbidden fields, and also contextual dependencies. From that description, one can then invoke the domain's C<inspect> method to check if a given value belongs to the domain or not. In case of mismatch, a structured set of error messages is returned, giving detailed explanations about what was wrong. The motivation for writing this package was to be able to express in a compact way some possibly complex constraints about structured data. Typically the data is a Perl tree (nested hashrefs or arrayrefs) that may come from XML, L<JSON|JSON>, from a database through L<DBIx::DataModel|DBIx::DataModel>, or from postprocessing an HTML form through L<CGI::Expand|CGI::Expand>. C<Data::Domain> is a kind of tree parser on that structure, with some facilities for dealing with dependencies within the structure, and with several options to finely tune the error messages returned to the user. The main usage for C<Data::Domain> is to check input from forms in interactive applications : the structured error messages make it easy to display a form again, highlighting which fields were rejected and why. Another usage is for writing automatic tests, with the help of the companion module L<Test::InDomain>. COPYRIGHT AND LICENCE Copyright 2006, 2007, 2012 by Laurent Dami. This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.