Default Query, saying WHERE some node has some relation to some object (All nodes are found)

SELECT DISTINCT ?node FROM DEFAULT
WHERE {
?node ?p ?o .
}


Select nodes with a certain type:

SELECT DISTINCT ?node FROM DEFAULT
WHERE {
?node <member-key> <type-id> .
}


Restrict nodes by relation 

SELECT DISTINCT ?node FROM DEFAULT
WHERE {
?node <relation-name> ?o .
}


Restrict nodes by attribute:

SELECT DISTINCT ?node FROM DEFAULT
WHERE {
  ?node attribute ?attr .

  FILTER (?attr = '100')
}


Restrict nodes by multiple relations to a single value:

SELECT DISTINCT ?node FROM DEFAULT
WHERE {
?node <relation1> ?node2 .
?node2 <relation2> ?node3 .
?node3 attribute ?attr .
FILTER (?attr = 5) .
}