subject-path.js
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subject-path.js
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	var clone = require("clone");

	var SubjectPath = function(subject_path){

	this.elements = [];
	this.subject_type_instance = null;

	this._init(subject_path);
	}

	SubjectPath.prototype = new function(){

	this._init = function(subject_path){
	this._load_path_elements(subject_path);
	}

	this._load_path_elements = function(subject_path){
	if (subject_path instanceof SubjectPath){
	this._from_path(subject_path);
	} else if (typeof subject_path === "string"){
	this._from_string(subject_path);
	} else if (subject_path instanceof Array){
	this._from_array(subject_path);
	}
	}

	this._from_string = function(description_string){
	this.elements = description_string.split(".");
	}

	this._from_array = function(description_array){
	this.elements = clone(description_array);
	}

	this._from_path = function(subject){
	this.elements = clone(subject.elements);
	}

	this.clone = function(){
	var cloned_elements = clone(this.elements);
	return new SubjectPath(cloned_elements);
	}

	this.tail = function(){
	return new SubjectPath(this.elements.slice(1))
	}

	this.head = function(){
	return this.elements[0];
	}
	}

	module.exports = SubjectPath;