Thursday 17th of May 2012 09:58:49 AM

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although they are not quite so fuzzy. As you can see from Figure 8-38, it is pretty easy to tell when an element has gone as far as possible to the right or left.

Figure 8-38. Get as far to the left (or right) as possible

8.3.2. Applied Behavior

There are a number of interesting consequences of the above rules, both because of what they say and what they don't say. The first thing to discuss is what happens

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Figure 11-8. Why we float twice

This is entirely consistent with the rules for floating, but it obviously isn't what we want. By floating the second column, we avoid this possibility altogether, and the columns stay straight.

Now let's place the pictures. There are two of them, both in the first column, so that makes things XML documents are also naturally committed to a database (relational or object) or any other kind of XML document store. There are commercial products available which allow you to save XML documents to an XML storage layer (which is not a database per se), like Datachannel's XStore and ODI's eXcelon. These XML store solutions are quite expensive ($10,000 to $20,000 range).

XML documents are also quite naturally retrieved from a persistence layer (databases, file systems, XML stores). This lends XML to be used in real world applications where the information being used by different parts of a system is the most important thing.

Information in an XML document is stored in plain-text. This might seem like a restriction if were thinking of embedding binary information in an XML document. There are several advantages to keeping things plain text. First, it is easy to write parsers and all other XML enabling technology on different platforms. Second, it makes everything very interoperable by staying with the lowest common denominator approach. This is the whole reason the web is so successful despite all its flaws. By accepting and sending information in plain text format, programs running on disparate platforms can communicate with each other. This also makes it easy to integrate new programs on top of older ones (without rewriting the old programs), by simply making the interface between the new and old program use XML.

For example, if you have an address book document stored in an XML file, created on a Mac, that you would like to share with someone who has a PC, you can simply email them the plain text address book XML document. This cant be done with binary encoded information which is totally platform (and program) dependent.

5.4.1. Fonts with Style

font-style is very simple: it's used toselect between normal text,italic text, and oblique text.That's it! The only complications are in recognizing thedifference between italic and oblique text and knowing why browsersdon't always give you a choice anyway.

Figure 9-20. An absolutely positioned paragraph

The paragraph is now positioned at the very beginning of thedocument, half as wide as the document's width and overwritingthe first few elements!

In addition, if the document is scrolled, the paragraph will scrollright along with it. This is because the element's containingblock is the BODY element's content area,not the viewport. If you want to position elements so thatthey're placed relative to the viewport and don't scroll