I just wanted to list out the basic parts of a WSDL and what they map to when you use/generate metadata.

WSDL Part

 WCF Config/Code

WSDL service 
            Groups of ports

Service

WSDL port

            Address Binding,PortType

Endpoints

WSDL portTypes

             Group of operations

Contracts

WSDL Bindings 

            Group of protocols

Binding