dap4/d4core/src/main/java/dap4/core/ce/CEConstraint.java
public String toConstraintString()
    {
        StringBuilder buf = new StringBuilder();
        boolean first = true;
        for(int i = 0; i < segments.size(); i++) {
            Segment seg = segments.get(i);
            if(!seg.var.isTopLevel())
                continue;
            if(!first) buf.append(";");
            first = false;
            dumpvar(seg, buf, true);
        }
        return buf.toString();
    }
public String toConstraintString()
    {
        StringBuilder buf = new StringBuilder();
        boolean first = true;
        for(int i = 0; i < segments.size(); i++) {
            Segment seg = segments.get(i);
            if(!seg.var.isTopLevel())
                continue;
            if(!first) buf.append(";");
            first = false;
            dumpvar(seg, buf, true);
        }
        return buf.toString();
    }
Convert the view to a constraint string suitable
for use in a URL, except not URL encoded.

@return constraint string