Wal-Mart priced it at $2.97--a year's

These style sheets are enabled by default (they are “on” when the page is loaded). They can then be disabled if the user selects an alternate style sheet.

To make a style sheet preferred, the rel attribute is set to “stylesheet” and the style sheet is named with the title attribute.

Several preferred style sheets can be grouped together by giving them identical title attributes. These grouped style sheets are then all enabled and disabled together. If more than one group of preferred style sheets are declared, the first group takes precedence.

To make paul.css preferred, a title attribute is added, giving the default style a name.
Components and Services
The topic of wiring elements together drags me almost immediately into the knotty terminology problems that surround the terms service and component. You find long and contradictory articles on the definition of these things with ease. For my purposes here are my current uses of these overloaded terms.

I use component to mean a glob of software that's intended to be used, without change, by application that is out of the control of the writers of the component. By 'without change' I mean that the using application doesn't change the source code of the components, although they may alter the component's behavior by extending it in ways allowed by the component writers.

A gallon-sized jar of whole pickles is something to behold. The jar is the size of a small aquarium. The fat green pickles, floating in swampy juice, look reptilian, their shapes exaggerated by the glass. It weighs 12 pounds, too big to carry with one hand. The gallon jar of pickles is a display of abundance and excess; it is entrancing, and also vaguely unsettling. This is the product that Wal-Mart fell in love with: Vlasic's gallon jar of pickles.

Wal-Mart priced it at $2.97--a year's supply of pickles for less than $3! "They were using it as a 'statement' item," says Pat Hunn, who calls himself the "mad scientist" of Vlasic's gallon jar. "Wal-Mart was putting it before consumers, saying, This represents what Wal-Mart's about. You can buy a stinkin' gallon of pickles for $2.97. And it's the nation's number-one brand."

Therein lies the basic conundrum of doing business with the world's largest retailer. By selling a gallon of kosher dills for less than most grocers sell a quart, Wal-Mart may have provided a ser-vice for its customers. But what did it do for Vlasic? The pickle maker had spent decades convincing customers that they should pay a premium for its brand. Now Wal-Mart was practically giving them away. And the fevered buying spree that resulted distorted every aspect of Vlasic's operations, from farm field to factory to financial statement.


A service is similar to a component in that it's used by foreign applications. The main difference is that I expect a component to be used locally (think jar file, assembly, dll, or a source import). A service will be used remotely through some remote interface, either synchronous or asynchronous (eg web service, messaging system, RPC, or socket.)

I mostly use service in this article, but much of the same logic can be applied to local components too. Indeed often you need some kind of local component framework to easily access a remote service. But writing "component or service" is tiring to read and write, and services are much more fashionable at the moment.