Keywords are used for Elements and can be used for Attributes and Values. All keywords are prefixed by ‘@'.
@general which refers to the ‘clash’,
@element-1 which refers to one of the clashing elements,
@element-2 which refers to the other element.
Attribute may be a
Keyword related to the Item, or may be any
Attribute, for example SHOP, or NAME etc.
Value may be selected from a list-of-values related to the given attribute, or a
Regular Expression, (Refer to
Notes on Wildcards) or a
Keyword (Refer to
Expression Syntax).