Tags syntax for MODx Revolution (source : http://modxcms.com/forums/index.php/topic,55574.msg320386.html#msg320386)

gistfile1.txt

[[ (opening tags)
! (optional non-cacheable flag)
elementToken (optional token identifying the element type if it's not a snippet, $=chunk, *=resource field/tv, +=placeholder, etc.)
elementName
@propertyset (optional PropertySet identifier)
:filterName=`modifier`:... (optional one or more output filters)
? (optional; indicates beginning of property string)
&propertyName=`propertyValue` &... (optional; any additional properties separated by &)
]] (closing tags)