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--- groimp-platform:xl-operators [2024/04/30 18:23] – [Analytical Operators] timOb
+++ groimp-platform:xl-operators [2025/01/10 15:08] (current) – [Pattern predicates] gaetan
@@ Line 1: / Line 1: @@
-XL-Operators are designed to simplify the usage of XL queries and rewriting rules. Moreover these operators can improve the performance of a query due to there deep integration into the model.
+===== Production operators =====
-In the following the operators a separated into Analytical and selection operators to either get a value for analysis or a node/ a collection of nodes for rewriting.
-====== Analytical Operators ======
+Production operators are operators that can be used in a production statement.
-| Command | description | example |
+==== Edge operators ====
-| min((*//query//*)[//value//]) | returns the smallest value | min((*F*)[length]) |
-| max((*//query//*)[//value//]) | returns the largest value | max((*F*)[length]) |
-| sum((*//query//*)[//value//]) | calculate the sum of the values | sum((*F*)[length]) |
-| prod((*//query//*)[//value//]) | unclear | prod((*F*)[length]) |
-| count((*//query//*) )| returns the number of pattern matching the query | count((*F*) ) |
-| empty((*//query//*) ) | returns true if no pattern matches the query | empty((*F*) ) |
-====== Selection Operators ======
-|command | description|example|
-|selectWhere()|  |  |
-|selectWhereMin()|  |  |
-|selectWhereMax()|  |  |
-|selectRandomly()|  |  |
+| whitespace | add node and connect with previous node, if any, by a successor edge |
+| > | connect node with previous by a successor edge |
+| < | connect node with previous by a reverse successor edge |
+| %%<->%% | connect node with previous by successor edges in both directions |
+| %%---%% | connect node with previous by a successor edge if there does not yet exist such an edge in either direction |
+| %%+>%%, %%<+%%, %%<+>%%, %%-+-%% | as before, but branch instead of successor edges |
+| %%/>%%, %%</%%, %%</>%%, %%-/-%% | as before, but refinement instead of successor edges |
+| %%-e->%%, %%<-e-%%, %%<-e->%%, %%-e-%% with an int-valued expression e | as before, but edges of type e instead of successor edges |
+| %%-n->%% with a node-valued expression n | create a compound edge with n encoding the edge data |
+| %%<-n-%% with a node-valued expression n | as before, but reverse direction |
+| [, ] | define the starts and the end of a branch connected subgraph |