listing13-06_build.xml_usingextensionconditionally

着几乎所有智能机厂商都将有自己配套的App Store,甚至并非智能手机制造商的三星也有意加入本次混战. 当然,我们也不能忘记苹果最先从iTunes中得到的灵感,从而带来了应用程序商店,一个正确

<!-- use your extension conditionally by specifying the "if" or "unless" attributes: -->

<preprocessor
	name="fullscreen"
	if="polish.classes.fullscreen:defined"
>
	<parameter name="logfile" value="log.txt" />
</preprocessor>