Use DOM to directly manipulate the information stored in the document (which DOM turns into a tree of nodes). This document object is created by the DOM XML parser after it reads in the XML document. This option leads to messy and hard-to-understand code. Also, this works better for document-type data rather than just computer generated data (like data structures and objects used in your code).

Create your own Java object model that imports information from the XML document by using either SAX or DOM. This kind of object model only uses SAX or DOM to initialize itself with the information contained in the XML document(s). Once the parsing and initialization of your object model is completed, DOM or SAX isn't used anymore. You can use your own object model to accessed or modify your information without using SAX or DOM anymore. So you manipulate your information using your own objects, and rely on the SAX or DOM APIs to import the information from your ApplicationML file into memory (as a bunch of Java objects). You can think of this object model as an in-memory instance of the information that came was "serialized" in your XML document(s). Changes made to this object model are made persistent automatically, you have to deal with persistence issues (ie, write code to save your object model to a persistence layer as XML).

Create your own Java object model (adapter) that uses DOM to manipulate the information in your document object tree (that is created by the parser). This is slightly different from the 2nd option, because you are still using the DOM API to manipulate the document information as a tree of nodes, but you are just wrapping an application specific API around the DOM objects, so its easier for you to write the code. So your object model is an adapter on top of DOM (ie, it uses the adapter pattern). This application specific API uses DOM and actually accesses or modifies information by going to the tree of nodes. Changes made to the object model still have to be made persistence (if you want to save any changes). You are in essence creating a thin layer on top of the tree of nodes that the parser creates, where the tree of nodes is accessed or modified eventually depending on what methods you invoke on your object model.

Depending on which of the three options you use to access information using your Java classes, this information must at some point be saved back to a file (probably to the one from which it was read). When the user of your application invokes a File->Save action, the information in the application must be written out to an ApplicationML file. Now this information is stored in memory, either as a (DOM) tree of nodes, or in your own proprietary object model. Also note that most DOM XML parsers can generate XML code from DOM document objects (but its quite trivial to turn a tree of nodes into XML by writing the code to do it yourself). There are 2 basic ways to get this information back into an ApplicationML file:

Thursday 28th of August 2008 08:10:07 PM

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"as high as possible" (which could be, and in fact hasbeen, argued to mean "as high as conveniently possible"),you cannot rely on consistent behavior even among browsers that areconsidered CSS1-compliant. Most browsers will follow historicalpractice and float the image down into the next line, but afew -- Opera 3.6, for one -- will float the image into thecurrent line if it has room to do so.

9. A left-floating element must be put as far to the left

Figure 8-41. Backgrounds "slide under" floated elements

Because the floated element is both within and without the flow, this sort of thing is bound to happen. What's going on? Well, the content of the paragraphs is being "displaced" by the floated element. However, each paragraph's element width is still as wide as its parent element. Therefore, its content area spans the width of the parent, and so does the background. The actual content doesn't flow all the way across its own content area in order to avoid being obscured behind the floating element.
RGB color. In fact, if you were to open up acomputer monitor, or even a television, and you got far enough intothe projection tube, you would discover that there are three"guns." (Remember, however, that actually looking forthese guns will pretty much void your monitor's warranty.)These guns shoot out beams of light in varying levels of light anddark, in one of the three RGB colors, at each point on the screen.The brightnesses of each of these beams combine at each point to formall of the colors you see on your screen. Each point, by the way, isknown as a pixel, which is a term to which we'll
(To resurrect the old paper-and-plastic analogy, the plastic marginsaround an image never overlap the plasticsurrounding other elements.)
If you do float a textelement, realize that unless you declare awidth for that element, the CSSspecification says that its width will tend toward zero. Thus, afloated paragraph could literally be one character wide, assuming