Contains a library of <see cref="T:Facepunch.ActionGraphs.NodeDefinition" />s, each with a unique identifier. Custom node definitions can be added with <see cref="M:Facepunch.ActionGraphs.NodeLibrary.Add(Facepunch.ActionGraphs.NodeDefinition)" />, or from methods marked with either <see cref="!:ActionNodeAttribute" /> or <see cref="!:ExpressionNodeAttribute" /> when using <see cref="M:Facepunch.ActionGraphs.NodeLibrary.AddAssembly(System.Reflection.Assembly)" />.