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This package contains interfaces and classes representing various CSS concepts.

<p>
An <code>ICSSDocument</code> represents all the CSS code in a
<code>.css</code> file or within a <code>&lt;Style&gt;</code> tag in MXML.
It is the root of a tree of objects of type <code>ICSSNode</code>.
</p>

<p>
For example, CSS such as as
<pre>
Button { color: red; font-size: 12 }
</pre>
is represented by an <code>ICSSRule</code> which has one simple
<code>ICSSSelector</code> named <code>"Button"</code> and two
<code>ICSSProperty</code> objects named <code>"color"</code>
and <code>"font-size"</code>.
Each <code>ICSSProperty</code> has an <code>ICSSPropertyValue</code>;
in this case they represent the two values <code>red</code>
and <code>12</code>.
</p>

<p>
A rule can have a list of selectors, each of which can be a complex combination
of simple selectors; they are  stored in a linked-list-like data structure,
where an <code>ICSSCombinator</code> in the link between between selectors.
<p>

<p>
Unlike AS and MXML source files, a CSS source file doesn't create a compilation
unit in a project. There are three reasons for this:
<ul>
<li>The dependency discovery loop for compilation units
doesn't work for CSS.</li>
<li>CSS syntax trees are not used by other sub-systems.</li>
<li>The output of CSS is different than other compilation units' output.
A CSS file does not contribute to a SWF tag of its own,
and all of its content does not get generated into ABC code.</li>
</ul>
</p>

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