Documentation and minor changes

import java.util.Map;

/** Represents a data dependency in an object-oriented SDG or PDG. */

public class FlowDependencyArc extends Arc {

    public FlowDependencyArc() {

        super();

import java.util.Map;

/** Represents a data dependency between objects or between a field

 *  and its parent in an object oriented SDG or PDG. */

public class ObjectFlowDependencyArc extends Arc {

    public ObjectFlowDependencyArc() {

        super();

import java.util.Map;

/** Replaces control dependencies that were used to generate a tree-like

 *  structure in the PDG and SDG. Some examples include the connection

 *  of actual/formal-in/out and object trees. They should always be traversed. */

public class StructuralArc extends Arc {

    @Override

    public Map<String, Attribute> getDotAttributes() {

import java.util.Map;

/** Represents a dependence where the source completely defines

 *  the target. This is used when the type of an object or just

 *  its existence is required, but not any specific field. */

public class TotalDefinitionDependenceArc extends Arc {

    @Override

    public Map<String, Attribute> getDotAttributes() {

        return graphNode;

    }

    /** Represents an input/output arc with an additional traversal restriction.

     *  It merges the functions of an interprocedural input/output arc and an

     *  object-flow arc. */

    public static class ObjectFlow extends ParameterInOutArc {

        @Override

        public boolean isObjectFlow() {