gis:property-value
gis:property-value vector-feature property-name
Reports the value of the property with the given name for the given VectorDataset. The reported value may be a number, a string, or a boolean value, depending on the type of the field in the underlying data file.
For shapefiles, values from dBase CHARACTER and
DATE fields are returned as strings, values from
NUMBER and FLOAT fields are returned as numbers,
and values from LOGICAL fields are returned as boolean
values. MEMO fields are not supported. DATE
values are converted to strings using ISO 8601 format
(YYYY-MM-DD).