Creating a shaderdriven engine

My old 3d engine had no shaderprogram support at all, so I decided to re-design it with shaders as the primary functionality. I've designed a simple shaderformat with focus on reuseability of shader elements

# Shader Default // name Default

	# Declaration VNT // name VNT (VertexNormalTexture)

		# Stream 0 Vertex
		# Stream 1 Normal
		# Stream 2 Texture

	# End Declaration

	# Material MyMaterial // name MyMaterial

		# Ambient  255 255 255 255
		# Diffuse  255 255 255 255
		# specular 255 255 255 255
		# Emissive 255 255 255 255

		# Pass 0 Streamsource 2 // fetch texcoord from stream 2
	
			# Texture 	"Texture.png" Texture // name Texture
	
			# Operation	ColorOperation
			# Arguments	Arg0 Arg1
	
		# End Pass

		# Pass 1 Streamsource 2 // fetch texcoord from stream 2

			# Texture	"Texture2.png" Texture2 // name Texture2
		
			# operation	ColorOperation
			# Arguments	Arg0 Arg1

			# Operation	ColorOperation
			# Arguments	Arg0 Arg1

		# End Pass

	# End Material

	# Program
		# "../program.fx" 	ShadowVolumeExtraction
		# "../program2.fx"	StencilShadow	
		# "../program3.fx"	PerPixelLighting
	# End Program

# End Shader

As you might notice, each subset except texture passes has an identifier assigned to it and here is where I can see some design flaws, can you? I'd appreciate if you could give me your opinions about my shader format and what I can improve