The value for the option specified by <var>$1optionname</var>, can contain pipe characters.

List of changes, formatted name=value (e.g. skin=vector). Value cannot contain pipe characters. If no value is given (not even an equals sign), e.g., optionname|otheroption|..., the option will be reset to its default value.

The name of the option that should be set to the value given by <var>$1optionvalue</var>.

The value you specified is not a valid option.

{{exif-qqq}}

This message labels the author or artist of the work. Usually this means who took the photograph, or who drew the picture. The corresponding value field most commonly contains a single author, however it can contain an ordered (or unordered depending on which metadata standard is used to store the information) list of authors. Sometimes the persons position is prefixed before their name such as "Photographer, John Smith". The exif standard recommends multiple authors be specified by "position, Author 1; position for author 2, Author 2's name" however this doesn't seem to happen in practice very often. If multiple authors are specified using a non-exif standard, then a billeted (or numbered) list is used.

This property can be specified by exif Artist tag, XMP's tiff:Artist, XMP's dc:creator, iptc-iim's 2:80 byline, PNG's author textual chunk, PNG's (unofficial) artist textual chunk. XMP's photoshop:AuthorsPosition and iptc 2:85 byline-title can also affect display of this property.

{{Identical|Author}}

Some parameter types in API requests need further explanation:
;boolean
:Boolean parameters work like HTML checkboxes: if the parameter is specified, regardless of value, it is considered true. For a false value, omit the parameter entirely.
;timestamp
:Timestamps may be specified in several formats. ISO 8601 date and time is recommended. All times are in UTC, any included timezone is ignored.
:* ISO 8601 date and time, <kbd><var>2001</var>-<var>01</var>-<var>15</var>T<var>14</var>:<var>56</var>:<var>00</var>Z</kbd> (punctuation and <kbd>Z</kbd> are optional)
:* ISO 8601 date and time with (ignored) fractional seconds, <kbd><var>2001</var>-<var>01</var>-<var>15</var>T<var>14</var>:<var>56</var>:<var>00</var>.<var>00001</var>Z</kbd> (dashes, colons, and <kbd>Z</kbd> are optional)
:* MediaWiki format, <kbd><var>2001</var><var>01</var><var>15</var><var>14</var><var>56</var><var>00</var></kbd>
:* Generic numeric format, <kbd><var>2001</var>-<var>01</var>-<var>15</var> <var>14</var>:<var>56</var>:<var>00</var></kbd> (optional timezone of <kbd>GMT</kbd>, <kbd>+<var>##</var></kbd>, or <kbd>-<var>##</var></kbd> is ignored)
:* EXIF format, <kbd><var>2001</var>:<var>01</var>:<var>15</var> <var>14</var>:<var>56</var>:<var>00</var></kbd>
:*RFC 2822 format (timezone may be omitted), <kbd><var>Mon</var>, <var>15</var> <var>Jan</var> <var>2001</var> <var>14</var>:<var>56</var>:<var>00</var></kbd>
:* RFC 850 format (timezone may be omitted), <kbd><var>Monday</var>, <var>15</var>-<var>Jan</var>-<var>2001</var> <var>14</var>:<var>56</var>:<var>00</var></kbd>
:* C ctime format, <kbd><var>Mon</var> <var>Jan</var> <var>15</var> <var>14</var>:<var>56</var>:<var>00</var> <var>2001</var></kbd>
:* Seconds since 1970-01-01T00:00:00Z as a 1 to 13 digit integer (excluding <kbd>0</kbd>)
:* The string <kbd>now</kbd>

List of types of options to reset when the <var>$1reset</var> option is set.

List of types of options to reset when the <var>$1reset</var> option is set.

Message displayed instead of an input value's preview when no value is specified yet or when the specified value could not be interpreted by the system.

Error message indicating the value needs to contain $1 or more characters

Short descriptive title of a some-value snak (see [[d:Wikidata:Glossary]]) used in a drop-down menu allowing to select the snak type when adding or editing a snak. The drop-down menu can be opened by clicking an anchor right next to the input element(s) used to specify a claim's value. Although this is regarded a 'special', seldom used feature, the term 'snak' should be avoided here since the concept of snaks is a technical abstraction that does not give any additional meaning within the user interface. The basic meaning of this option is that a value exists but it is unknown.

A short descriptive title of a no-value snak (see [[d:Wikidata:Glossary]]) used in a drop-down menu allowing to select the snak type when adding or editing a snak. The drop-down menu can be opened by clicking an anchor right next to the input element(s) used to specify a claim's value. Although this is regarded a 'special', seldom used feature, the term 'snak' should be avoided here since the concept of snaks is a technical abstraction that does not give any additional meaning within the user interface. The basic meaning of this option is that no value exists.

Label displayed above the preview of a value that is being entered by the user. The preview is the system's interpretation of the specified value and - since there is no strict definition for a user how to specify values - visualizes how the value will be displayed later on after the value has been saved.

radius of the circle must be a numeric value, but specified "$1"

Error message stating the bio must contain more characters. Parameters:
* $1 is the minimum number of characters.

Error message stating the bio must contain more characters. Parameters:
* $1 is the minimum number of characters.

Similar to <var>filter</var>, but the provided value serves as a filter only for the <var>value</var> field of an ExtJS component

The value you specified is above the maximum of $1.

The value you specified is below the minimum of $1.

Default value for the option of a different project namespace name in the MediaWiki installer.

Following Wikipedia's example, many wikis keep their policy pages separate from their content pages, in a '''project namespace'''.
All page titles in this namespace start with a certain prefix, which you can specify here.
Usually, this prefix is derived from the name of the wiki, but it cannot contain punctuation characters such as "#" or ":".

Error message indicating that a value is too short. Parameters:
* $1 - the minimum number of characters required for the field

Error message indicating that a value is too short. Parameters:
* $1 - the minimum number of characters required for the field

List of module names (values of the <var>action</var> and <var>format</var> parameters, or <kbd>main</kbd>). Can specify submodules with a <kbd>+</kbd>.

A maximum of thirty characters can be entered.