/*
* Copyright (c) 2014, Francis Galiegue (fgaliegue@gmail.com)
*
* This software is dual-licensed under:
*
* - the Lesser General Public License (LGPL) version 3.0 or, at your option, any
* later version;
* - the Apache Software License (ASL) version 2.0.
*
* The text of both licenses is available under the src/resources/ directory of
* this project (under the names LGPL-3.0.txt and ASL-2.0.txt respectively).
*
* Direct link to the sources:
*
* - LGPL 3.0: https://www.gnu.org/licenses/lgpl-3.0.txt
* - ASL 2.0: http://www.apache.org/licenses/LICENSE-2.0.txt
*/
/**
* Format attribute base classes
*
* <p>The {@code format} keyword plays a particular role in JSON Schema
* validation, since it is the only keyword performing semantic validation.
* Note that supporting it is <i>optional</i>, and that implementations are
* asked to provide a way to deactivate format checking on demand. This
* implementation offers this option.</p>
*
* <p>Draft v4 defines a narrower subset of format attributes than draft v3.
* The following format attributes are common to both draft v3 and draft v4:</p>
*
* <ul>
* <li>{@code date-time};</li>
* <li>{@code email};</li>
* <li>{@code host-name};</li>
* <li>{@code ipv6};</li>
* <li>{@code regex};</li>
* <li>{@code uri}.</li>
* </ul>
*
* <p>Draft v3 defines the following additional attributes:</p>
*
* <ul>
* <li>{@code date};</li>
* <li>{@code phone};</li>
* <li>{@code time};</li>
* <li>{@code utc-millisec};</li>
* <li>{@code color} (<b>unsupported</b>);</li>
* <li>{@code style} (<b>unsupported</b>).</li>
* </ul>
*
* <p>Additionally, there is an attribute named {@code ip-address} in draft v3,
* and {@code ipv4} in draft v4, which can validate IPv4 addresses.</p>
*/
package com.github.fge.jsonschema.format;