This syntax represents some variables which can be used in Tiki, like: user, page, itemId. With a simple Wiki Syntax using double curly brackets around them, (once this preference is enabled in "Editing & Plugins" control panel) you can put them in your wiki syntax enabled text area and have them to become automatically replaced by their actual value anywhere where they are used.

The feature must be set at : Admin (tiki-admin.php) -> Editing and Plugins -> Wiki argument variables

 {{itemId}}      (on a tracker item)
 {{page}}        (on a wiki page)
 {{pageid}}      (id from a wiki page; added in Tiki 12.1)
 {{user}}        (when a user is logged in)
 {{domain}}      (site domain; added in Tiki 12.1)
 {{domainslash}} (site domain ending with a slash; added in Tiki 12.1)
 {{domainslash_if_multitiki}} (only when in a multitiki installation, 
                 site domain ending with a slash;
                 if the page doesn't belong to a multitiki installation,
                 nothing is returned; added in Tiki 12.1)
 {{lastVersion}} (last version of the wiki page; added in Tiki 12.2)
 {{lastAuthor}}  (last editor of the wiki page; added in Tiki 12.2)
 {{lastModif}}   (last modification date, in short format, 
                 of the wiki page; added in Tiki 12.2)
 {{lastItemVersion}} (last version of the tracker item 
                 indicated in the url; added in Tiki 12.2)
 {{lastItemAuthor}} (last editor of the tracker item 
                 indicated in the url; added in Tiki 12.2)
 {{lastItemModif}} (last modification date, in short format, 
                 of the tracker item indicated in the url; added in Tiki 12.2)
 {{lastApprovedVersion}} (last approved version of the wiki page
                 when revision approval is on; added in Tiki 12.3)
 {{lastApprover}} (last approver of the wiki page
                 when revision approval is on; added in Tiki 12.3)
 {{lastApproval}} (last approval date, in short format, of the wiki page
                 when revision approval is on; added in Tiki 12.3)
 {{currentVersion}} (current version being displayed of the wiki page
                 when revision approval is on; added in Tiki 14.0)
 {{currentVersionApprover}}  (approver of the current version being displayed
                 when revision approval is on; added in Tiki 14.0)
 {{currentVersionApproval}}   (approval date, in short format, of the current version being displayed
                 when revision approval is on; added in Tiki 14.0)
 {{currentVersionApproved}}  (indicate whether current version being displayed of the wiki page
                   is approved or not when revision approval is on; added in Tiki 14.0)

{{user}} will display the user login as per the settings on the log-in control panels. If you enabled "Use email as username" it will display the user email. (this variable value is not synchronised with the display real name options)

Example

If you put this syntax on a page named "My Profile":

* #{{itemId}}
* {{page}}
* {{user}}
* {{domain}}
* {{domainslash}}

it will produce (assuming you're viewing the page logged in as user admin):

• #1
• My Profile
• admin
• doc.tiki.org
• doc.tiki.org/

This:

You are currently on the page ID -+{{pageid|undefined}}+- with the name "''{{page}}''". Check the [tiki-pagehistory.php?page=Wiki+Argument+Variables&source=0|wiki source]!.
Your username is __{{user|nothing}}__.

Renders as:
You are currently on the page ID 4091 with the name "Wiki Argument Variables". Check the wiki source!.
Your username is .

When this option is active, it is possible to show the value of variables passed by argument on the URL. Note that a default value can be provided.

*''lalala'' is: {{lalala}}
*''lalala'' is:  {{lalala|nothing}} 

Shows:

Follow the link to give a value to lalala: tiki-index_raw.php?page=Wiki+Argument+Variables&lalala=trololo

You can see it in action in this profile:

• GeoCMS_Maps_22 - See the "Sant Andreu" page created by the profile

You can use URL parameter to pass and create a variable to be displayed on a Wiki page or be used in a plugin.

Click on this link (Wiki-Argument-Variables?testVar=Nice) to populate the variable "testVar" on this page that will be displayed below. (empty when you load the page without the URL parameter)
The variable testVar =

Alias names for this page:
ArgumentVariables | argvars | Argument Variables | arg vars | ArgumentVariable | argvar | Argument Variable | arg var | Wiki Argument Variable | WikiArgumentVariable | WikiArgumentVariables