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<p>Contains interfaces for the data layer, mainly for binding typed
data and data collections to components, and for validating data.</p>
<h2>Data binding</h2>
<p>The package contains a three-tiered structure for typed data
objects and collections of them:</p>
<ul>
<li>A {@link com.vaadin.data.Property Property} represents a
single, typed data value.
<li>An {@link com.vaadin.data.Item Item} embodies a set of <i>Properties</i>.
A locally unique (inside the {@link com.vaadin.data.Item Item})
Property identifier corresponds to each Property inside the Item.</li>
<li>A {@link com.vaadin.data.Container Container} contains a set
of Items, each corresponding to a locally unique Item identifier. Note
that Container imposes a few restrictions on the data stored in it, see
{@link com.vaadin.data.Container Container} for further information.</li>
</ul>
<p>For more information on the data model, see the <a
href="http://vaadin.com/book/-/page/datamodel.html">Data model
chapter</a> in Book of Vaadin.</p>
<h2>Buffering</h2>
<p>A {@link com.vaadin.data.Buffered Buffered} implementor is able
to track and buffer changes and commit or discard them later.</p>
<h2>Validation</h2>
<p>{@link com.vaadin.data.Validator Validator} implementations are
used to validate data, typically the value of a {@link
com.vaadin.ui.Field Field}. One or more {@link com.vaadin.data.Validator
Validators} can be added to a {@link com.vaadin.data.Validatable
Validatable} implementor and then used to validate the value of the
Validatable. </p>
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