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<p>validation;<br/>
* Code and cross-reference validation;<br/>
* <a href="page.php?w=Structure_validation">Structured validation</a>; and<br/>
* Consistency validation</p>

<p><big>Data-type check</big></p>
<p>Data type validation is customarily carried out on one or more simple data fields.</p>

<p>The simplest kind of data type validation verifies that the individual characters provided through user input are consistent with the expected characters of one or more known <a href="page.php?w=Primitive_data_type">primitive data types</a> as defined in a programming</p><p>
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