How would I convert this to a simple Linq expression? I got a bit confused on the edges and subpaths.

            RelationPredicateBucket bucket = new RelationPredicateBucket();
            bucket.Relations.AddRange(CompanyEntity.Relations.GetAllRelations());
            bucket.PredicateExpression.AddWithAnd(NameFields.Name == Name);
            bucket.PredicateExpression.AddWithAnd(LocationFields.LocationAddress == Street);
            bucket.PredicateExpression.AddWithAnd(LocationFields.LocationCity == City);
            bucket.PredicateExpression.AddWithAnd(LocationFields.LocationState == State);

Company's have Names and Locations.

Prefetch paths are for fetching graphs in 1 go. filtering on related entities is something else: you want to fetch a single set, and limit that set on related entities.

Say I want to fetch all orders, from customers which are from Germany:

var q = from o in metaData.Order where o.Customer.Country=="Germany" select o;

here, I navigate over 'Customer', and the provider knows what relation that is and does the join for you

With this info, could you formulate the query yourself, or did you run into a wall while trying?

Ah.

I thought I have to add Relations with prefetches in Linq.

It seems I was making the simple complex.

Ian