public void ReactionElement(Hashtable attrs)
{
Reaction reaction = new Reaction(this.model, attrs);
Boolean fast = false;
Boolean reversible = true;
if (attrs.Contains("fast"))
fast = Boolean.Parse((String)attrs["fast"]);
if (attrs.Contains("reversible"))
reversible = Boolean.Parse((String)attrs["reversible"]);
reaction.AddProperties(fast, reversible);
this.model.listOfReactions.Add(reaction);
elementStack.Push(reaction);
}