function scopeCatalog(){
	this.scopes=new Array()

	// ====== Interface =========
    this.addScope=_add_scope

    function _add_scope(scope){
        if (scope){
			this.scopes[this.scopes.length]=scope
		}
    }
}
//------------------------------------------------

function scope(topic){
    // Just one topic to a scope
	// A scope holds the topic id, not a
	// topic itself
	this.topic=topic||''
	//this.erase=_erase
}

	function _erase(){
		this.topic=''
	}


scope.prototype.erase=_erase
scope.prototype.toString=scopeToString

function scopeToString(){
	return "[scope]"
}

//------------------------------------------------