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Corese is a Semantic Web Factory (triple store and SPARQL endpoint) implementing RDF, RDFS, SPARQL 1.1 Query and Update, Shacl. STTL. LDScript.

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#
# Event driven functions to trace Rule Engine
#

@public @beforeEntailment 
function us:beforeEntailment (re, path) {
        set(countLoop = 0);
	xt:print("before entailment:", path, xt:size(xt:graph()))
}

@public @afterEntailment 
function us:afterEntailment(re, path) {
	xt:print("after entailment:", path, xt:size(xt:graph()))
}

@public @prepareEntailment 
function us:prepareEntailment(re, q) {
	xt:print("prepare entailment:", xt:size(xt:graph()));
        xt:print(q)
}

@public @loopEntailment 
function us:loopEntailment(re, path) {
	xt:print("loop entailment:", set(countLoop = countLoop + 1), xt:size(xt:graph()))
}

#@public
@beforeRule
function us:beforeRule(re, q) {
    xt:print("@beforeRule");
    xt:print(java:getAST(q))
}

@public @afterRule
function us:afterRule(re, q, res) {
    if (xt:size(res) > 0) { # && java:hasMetadata(java:getAST(q), "@test")) {
        xt:print("@afterRule");
        xt:print(java:getAST(q));
        xt:print("result:", xt:size(res));
        xt:print()
    }
}