Property Expressions

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Property expressions are used as querycond arguments in ade_querydefine calls that define Property conditions.

They have the following format:

(property operator value [subclasses])

property	Property name (string). See the Property and Value Arguments table below.
operator	"=", ">", "<", "<=", ">=", "<>". Note that the only valid operator in a string context is "=".
value	Depends on the property argument. See the Property and Value Arguments table below.
subclasses	Optional. T or nil. The default if the argument is omitted is nil. This setting has no effect unless property is "feature". T means return all objects belonging to the feature class identified by the value argument, including objects belonging to any subclass of that feature. nil means do not include objects belonging to such a subclass.

Property and Value Arguments
Property	Value
area	Area value (string).
blockname	Block name (string).
color	Color (string).
elevation	Z coordinate (string).
"feature"	Feature name (string).
group	Group name (string).
layer	Layer name (string).
length	Length (string).
linetype	Line type (string).
"lineweight"	Line weight (string).
"plotstyle"	Plot style (string).
style	Text style (string).
thickness	Thickness (string).
objtype	Object type (string), or "unknown".
value	Text value (string).

The following examples define Property conditions. The first specifies a layer:

(setq qry_id 
    (ade_qrydefine  
         '("and" "" "" "property" ("layer" "=" "WATER") "" ) 
    ) 
)

And the second specifies a color:

(setq qry_id 
    (ade_qrydefine 
         '("or" "(" "not" "property" ("color" "=" "RED") "" ) 
    ) 
)