Ubuntu users, please note that this extension might not enabled for you by default. You may need to install by doing "sudo apt-get install php-xml" followed by web server restart.
This extension is enabled by default. It may be disabled by using the following option at compile time: --disable-xml
These functions are enabled by default, using the bundled expat library. You can disable XML support with --disable-xml. If you compile PHP as a module for Apache 1.3.9 or later, PHP will automatically use the bundled expat library from Apache. If you don't want to use the bundled expat library, configure PHP with --with-expat-dir=DIR, where DIR should point to the base installation directory of expat.
The Windows version of PHP has built-in support for this extension. You do not need to load any additional extensions in order to use these functions.
Ubuntu users, please note that this extension might not enabled for you by default. You may need to install by doing "sudo apt-get install php-xml" followed by web server restart.
Trying to look at the Oolite wiki, I was diverted to a page reading:
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MediaWiki 1.31 internal error
Installing some PHP extensions is required.
Required components
You are missing a required extension to PHP that MediaWiki requires to run. Please install:
xml (more information)
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Clicking on (more information) brought me here. Don't understand a word of the gubbins on this page. A complete mystery. "More information" for somebody with silicon chips for a brain, maybe, but not for an ordinary human being! No idea what PHP is. No idea what an xml is. No idea what a parser is. Or how to download whatever I'm supposed to download.