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{{{{SITENAME}}/Help}}
For help on MediaWiki templates in general, including how to create new templates, see [http://meta.wikimedia.org/wiki/Template Template]. <!-- keywords: how to edit a template editing -->

For a guide to existing {{qed}} templates, see [[{{SITENAME}}:Templates|Templates]].

For information about navigational templates, see [[Help:Navigational Templates]].

==Transcluding one page within another==
In general, it is possible to [[wikipedia:Transclusion|transclude]] the contents of a page (the source page) within another page (the master page). If the source page is in the main namespace, simply use the following syntax: 
:: <nowiki>{{:Page title}}</nowiki> 
where ''Page title'' is the title of the source page.

For example:
<pre>
= Big Headings =
{{:Quantum Electrodynamics}}
{{:Quantum Foam}}
</pre>

The content of each target page will be displayed at the point of transclusion when the master page is rendered. Any change to the content of one of the target pages will automatically be seen when the master page is next rendered. To force re-rendering, see [[Help:Refresh]].

==Using "=", "|", "{{((}}" and "{{))}}" within a template parameter value==

When a literal "=" cannot be used, one option is to use [[Template:eq]], e.g.
<pre>
{{dotted box
|The equation is E {{eq}} mc<sup>2</sup>
}}
</pre>

produces:

{{dotted box
|The equation is E {{eq}} mc<sup>2</sup>
}}

Similarly:
* [[Template:((|<nowiki>{{((}}</nowiki>]] and [[Template:))|<nowiki>{{))}}</nowiki>]] can be used when literal {{((}} or {{))}} strings are required.
* [[Template:((|<nowiki>{{!}}</nowiki>]] can be used when | is required.
* [[Template:((|<nowiki>{{!-}}</nowiki>]] can be used when |- is required.

There may be other options. For example, for URLs, it is probably a good idea to [[Help:URL Encoding|"urlencode"]] them anyway.

Another way to handle "=" within template parameters is to use the numbered-parameter syntax, e.g. the following are equivalent and produce {{target|http://abc.def.org?x{{eq}}y|x{{eq}}y}}:
* <nowiki>{{target|1=http://abc.def.org?x=y|2=x=y}}</nowiki> 
* <nowiki>{{target|http://abc.def.org?x{{eq}}y|x{{eq}}y}}</nowiki>

==Named values==

One way to define a set of named values (i.e. defined constants) would be to define a corresponding set of templates but it is usually better to define a single template that maps names to values.

For example, the standard color for "Cambrian" is <span style="background:{{period color|Cambrian}};">Cambrian</span>, and one could define a set of templates accordingly, but it is usually better to define a single template as a mapping.

This is illustrated by [[Template:period color]], which is defined so that for example <nowiki>{{period color|Cambrian}}</nowiki>
produces {{period color|Cambrian}}.  For an illustration of how this is used in practice, see [[Help:Timeline]].

For details about how to implement such a mapping, see [[Template:period color]].

==See also==
* [[Help:Functions]]
* [[Help:subst]]
* [[Help:Variables]]

Templates used on this page: