xl_programming_language:queries
Table of Contents
Graph queries in XL
Description
Queries are used to query existing graphs for specific features. They are used to analyse the actual graph and search for a specific pattern.
XL syntax
Queries are enclosed in asterisked parenthesis: (* *)
The elements are given in their expected order. For example, (* Internode Internode Apex *)
searches for a subgraph which consists of a sequence of nodes of the types Internode Internode Apex
, connected by successor edges.
Examples
- Find all
Internode
nodes, and print them out:
println( (* Internode *) )
- Find all newly created
Internode
nodes (with age 0):
(* i:Internode, (i[age] == 0) *)
- Search for all
Internode
nodes with diameter greater than 0.01:
(* i:Internode, (i[diameter] > 0.01) *)
- Find all pairs of segments
F
with distance smaller than 1:
(* f:F, g:F, ( (f != g) && (distance(f, g) < 1) ) *)
- Find all
Internode
nodes, connected to aLeaf
node with a branching edge:
(* Internode +> Leaf *)
xl_programming_language/queries.txt · Last modified: 2024/03/11 11:05 by ksmolen