FLEX3笔记！

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To obtain an object reference to an XML instance contained by parentNode.
childNodeName, you must use the form parentNode.childNodeName[index], even if
the XML instance you want is the only item in the XMLList (in which case it is
referred to as parentNode.childNodeName[0]).

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If an XML element contains text only (and does not contain child elements), converting
it to a string yields the text it contains, stripped of enclosing tags (e.g.,
converting <TITLE>Ulysses</TITLE> to a string yields "Ulysses" not "<TITLE>
Ulysses</TITLE>").

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If an XML element contains text and contains child elements, converting it to a
string yields the element’s source code, complete with tags.

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DisplayObject, the root of the core-display class hierarchy, defines the display API’s
first tier of graphical functionality: on-screen display. All classes that inherit from
DisplayObject gain a common set of fundamental graphical characteristics and capabilities.

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DisplayObject’s direct concrete subclasses—Video, Bitmap, Shape, MorphShape, and
StaticText—represent the simplest type of displayable content: basic on-screen
graphics that cannot receive input or contain nested visual content.

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DisplayObject’s only abstract subclass, InteractiveObject, establishes the second tier
of functionality in the display API: interactivity. All classes that inherit from
InteractiveObject gain the ability to respond to input events from the user’s mouse
and keyboard.

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InteractiveObject’s only abstract subclass, DisplayObjectContainer, is the base of the
third and final functional tier in the display API: containment. All classes that inherit
from DisplayObjectContainer gain the ability to physically contain any other
DisplayObject instance

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DisplayObjectContainer’s subclasses—Sprite, MovieClip, Stage, and Loader—each
provide a unique type of empty containment structure, waiting to be filled with content.
Sprite is the centerpiece of the container classes. As a descendant of both the
InteractiveObject the DisplayObjectContainer classes, Sprite provides the perfect foundation
for building custom user interface elements from scratch.

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The display list is the hierarchy of all graphical objects currently displayed
by the Flash runtime. When a display object is added to the display list and is
positioned in a visible area, the Flash runtime renders that display object’s content to
the screen.

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The root of the display list is an instance of the Stage class, which is automatically
created when the Flash runtime starts. This special, automatically created Stage
instance serves two purposes. First, it acts as the outermost container for all graphical
content displayed in the Flash runtime
Second,
it provides information about, and control over, the global characteristics of the
display area.