@Override
    public Object convert(Inspector value) {
        if (value.type() == Type.OBJECT || value.type() == Type.ARRAY) {
            return new PositionsData(value);
        }
        return convert(value.asString(""));
    }
Class converting data (historically XML-encoded) from a document summary field.
This has only been used to represent geographical positions.
@author Steinar Knutsen
container-search/src/main/java/com/yahoo/prelude/fastsearch/XMLField.java