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Property Expressions
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 Expression Parameters
| 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 | 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). |
Property Expression Examples
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") "" )
)
)