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This template is used in system messages, and on approximately 3,940,000 pages, or roughly 6% of all pages. Changes to it can cause immediate changes to the Wikipedia user interface. To avoid major disruption and server load, any changes should be tested in the template's /sandbox or /testcases subpages, or in your own user subpage .
This template provides a WCAG/ISO standards–compliant accessible alternative to <br />-separated lists, per WP:UBLIST and WP:PLIST. It uses proper HTML list markup, which is more standards-compliant and more accessible than separating list items with <br />. Detailed reasons for using this template can be found at WP:UBLIST.
This template is used in system messages, and on approximately 3,940,000 pages, or roughly 6% of all pages. Changes to it can cause immediate changes to the Wikipedia user interface. To avoid major disruption and server load, any changes should be tested in the template's /sandbox or /testcases subpages, or in your own user subpage .
Maintenance template to be placed in sections that are empty, containing neither text nor sub-sections. Before tagging an empty section, consider removing the section heading instead – for example, an empty "Gallery", "See also" or "External links" section can safely be deleted. Puts articles into [[Category:Articles with empty sections]] and [[Category:Articles to be expanded]]. Template ...
The empty string has several properties: |ε| = 0. Its string length is zero. ε ⋅ s = s ⋅ ε = s. The empty string is the identity element of the concatenation operation. The set of all strings forms a free monoid with respect to ⋅ and ε. ε R = ε. Reversal of the empty string produces the empty string, so the empty string is a palindrome.
Maintenance template to be placed in sections that are empty, containing neither text nor sub-sections. Before tagging an empty section, consider removing the section heading instead – for example, an empty "Gallery", "See also" or "External links" section can safely be deleted. Puts articles into [[Category:Articles with empty sections]] and [[Category:Articles to be expanded]]. Template ...
This template is used on approximately 114,000 pages. To avoid major disruption and server load, any changes should be tested in the template's /sandbox or /testcases subpages, or in your own user subpage .
The class null is a subclass of the symbol class, because nil is a symbol. Since nil also represents the empty list, null is a subclass of the list class, too. Methods parameters specialized to symbol or list will thus take a nil argument. Of course, a null specialization can still be defined which is a more specific match for nil.