By including the code file below, any Unity project can access RelationsInspector's API without depending on it to be present. This is useful when a tool should offer optional controls when the user has RelationsInspector installed, and hide them if he does not. For example, an optional button could create a graph window like this:
string backendTypeName = "TheBackendTypeNameYouWantToAccess";
// check if the backend as well as RelationsInspector are installed
if ( RelationsInspectorLink.HasBackend( backendTypeName ) )