>An attribute is a parameter to an element declared in the
DTD. An attribute's type and value range, including a possible
default value, are defined in the DTD.</dd>

<dt>DTD</dt>

<dd>A DTD, or document type definition, is a collection of XML
declarations that, as a collection, defines the legal structure,
<span class="term">elements</span>, and <span class="term">
attributes</span> that are available for use in a document that
complies to the DTD.</dd>

<dt>Document</dt>

<dd>A document is a stream of dat