A few simple tests

A few simple tests for the simplest triple matching. Test set is
attached (Steve - wasn't sure what to do about naming - can we discuss
this please?).

To get complete coverage, there would need to be more tests than just
these for this area but here is something to start the process.

Tests below from the attached file:

	Andy


---------------------------

==== Data:
@prefix : <http://example.org/data/> .

:x :p :v1 .
:x :p :v2 .

==== Query 1:
PREFIX : <http://example.org/data/>

SELECT *
WHERE { :x ?p ?q }

==== Result:
------------
| p  | q   |
============
| :p | :v1 |
| :p | :v2 |
------------


==== Query 2:
PREFIX : <http://example.org/data/>

SELECT *
WHERE { ?x :p ?q }

==== Result (same data):
------------
| x  | q   |
============
| :x | :v1 |
| :x | :v2 |
------------

---------------------------

==== Data:
@prefix : <http://example.org/data/> .

:y :y :x .
:x :y :y .
:y :x :y .

==== Query 3:

SELECT *
WHERE { ?a ?a ?b }

==== Result:
-----------
| a  | b  |
===========
| :y | :x |
-----------

---------------------------
==== Data:
dawg-data-01.n3 (already in test area)

==== Query 4: 
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> 
PREFIX  foaf:       <http://xmlns.com/foaf/0.1/>

SELECT ?name
FROM <file:dawg-data-01.n3>
WHERE
  { ?x rdf:type foaf:Person .
    ?x foaf:name ?name . }

==== Result:
-----------
| name    |
===========
| "Alice" |
| "Eve"   |
| "Bob"   |
-----------