see also: [[xl_programming_language:queries|Graph queries in XL]]

In the following a set queries is listed and the results of them applied on the graph in the image. This graph is created by the turtle query: ''A[F A][R F A] F A ;'' 

{{:tutorials:graph_query_example.png?400|}}
 
|Query | Result | Description |
|**Basic** |||
|A  or a:A | {a1,a2,a3,a4} | addresses all instances of module A  |
|a:A,a.len==1  or A(1) | all A with len==1 | unary predicates |
|**Node based path pattern** |||
|(* A F *) A  | {a3} | direct combination of nodes |
|(* F *) A | {a2,a3,a4} | other example |
|**Edge based path pattern** |||
|**ANY_EDGE** |||
| %%(* A --> *) F %% | {f1,f2} | next node |
| %%A (*<-- F*) %% | {a2,a3,a4} | prev node |
| %%(* F -- *) A  %% | {a1,a2,a3,a4} | undirected | 
|**SUCCESSOR_EDGE** |||
| %%(* A > *) F %% | {f2} | next  node |
| %%A (* < F *) %% | {a2,a3,a4} | prev  node |
| %%(* F --- *) A  %% | {a1,a2,a3,a4} | undirected | 
|**BRANCH_EDGE** |||
| %%(*A +>*) F %% | {f1} | next  node |
| %%A (* <+ F *) %% | {} | prev  node |
| %%(*F -+- *) A  %% | {a1} | undirected | 
|**Single Match, Late Match and Optional Patterns** |||
| %%A (: --> F)%% | {f1} | find first pattern |
| %%A (& --> F)%% | {f1} | find last pattern |
| %%A (? +> F)%% | {Null} | changes nothing to NULL |
|**Transitive closures** |||
| %%(* A > > *) A %% | {a3} | Path described by single edges |
| %%(* A +> > *) A %% | {a2} | other example |
| %%(* A (-->)* *) A %% | {a1,a2,a3,a4} |(0-to-n edges possible) |
| %%(* A (-->)+ *) A %% | {a2,a3,a4} | (1-to-n edges possible) |
| %%(* A (-->)? *) F %% | {f1,f2} | (0-to-1 edges possible) |
| %%(* A (-->){2} *)F %%  | {f2} | 2 edges |
| %%(* A (-->){1,2} *) A %% | {a2,a3} | min 1 max 2 edges | 
|**Combined** |||
| %%f:F, A +> f, A < f %% | {f1} | patterns combined by comma |