diff --git a/src/main/java/eu/dnetlib/validator2/validation/guideline/SyntheticGuideline.java b/src/main/java/eu/dnetlib/validator2/validation/guideline/SyntheticGuideline.java
index a00716a..9faecb1 100644
--- a/src/main/java/eu/dnetlib/validator2/validation/guideline/SyntheticGuideline.java
+++ b/src/main/java/eu/dnetlib/validator2/validation/guideline/SyntheticGuideline.java
@@ -32,13 +32,11 @@ public final class SyntheticGuideline extends AbstractGuideline<Document> {
         String canonical = Helper.ensureNonEmpty(name, () -> new IllegalArgumentException("Name cannot be empty"));
 
         // Here we define a guideline with a specific elementSpec as origin, we cannot allow null
-        if (elementSpec == null) {
+        if ( elementSpec == null )
             throw new IllegalArgumentException("ElementSpec cannot be empty");
-        }
 
-        if (weight < 0) {
+        if ( weight < 0 )
             throw new IllegalArgumentException("Weight cannot be negative");
-        }
 
         SyntheticGuideline guideline = new SyntheticGuideline(canonical, weight);
         guideline.compilationResult = new ElementSpecCompiler().compile(elementSpec, evaluation::get);
@@ -49,17 +47,14 @@ public final class SyntheticGuideline extends AbstractGuideline<Document> {
     public static SyntheticGuideline of(String name, int weight, RequirementLevel requirementLevel, Rule<Document> rule) {
         String canonical = Helper.ensureNonEmpty(name, () -> new IllegalArgumentException("Name cannot be empty"));
 
-        if (weight < 0) {
+        if ( weight < 0 )
             throw new IllegalArgumentException("Weight cannot be negative");
-        }
 
-        if (requirementLevel == null) {
+        if ( requirementLevel == null )
             throw new IllegalArgumentException("Requirement level cannot be empty");
-        }
 
-        if (rule == null) {
+        if ( rule == null )
             throw new IllegalArgumentException("Rule cannot be empty");
-        }
 
         SyntheticGuideline guideline = new SyntheticGuideline(canonical, weight);
         CompilationResult compilationResult = new CompilationResult();
diff --git a/src/main/java/eu/dnetlib/validator2/validation/guideline/openaire/AbstractOpenAireProfile.java b/src/main/java/eu/dnetlib/validator2/validation/guideline/openaire/AbstractOpenAireProfile.java
index 88e6bf4..4f97071 100644
--- a/src/main/java/eu/dnetlib/validator2/validation/guideline/openaire/AbstractOpenAireProfile.java
+++ b/src/main/java/eu/dnetlib/validator2/validation/guideline/openaire/AbstractOpenAireProfile.java
@@ -42,7 +42,7 @@ public abstract class AbstractOpenAireProfile implements XMLApplicationProfile {
         final Map<String, Guideline.Result> results = new HashMap<>();
 
         // Validate the document against all guideline-elements.
-        for (Guideline<Document> guidelineElement : guidelines())
+        for ( Guideline<Document> guidelineElement : guidelines() )
         {
             String guidelineElementName = guidelineElement.getName();
             if ( logger.isTraceEnabled() )
@@ -79,10 +79,10 @@ public abstract class AbstractOpenAireProfile implements XMLApplicationProfile {
             // The nodes contain all the elementName nodes
             int len = nodes.getLength();
             if (len == 0) { return false; } // element is not present
-            for(int i = 0; i < len; i++) {
+            for ( int i = 0; i < len; i++ ) {
                 Node elem = nodes.item(i);
                 String value = Helper.getAttributeValue(elem, attrName);
-                if (!attrValue.equals(value)) { return false; }
+                if ( !attrValue.equals(value) ) { return false; }
             }
             return true;
         });
diff --git a/src/test/groovy/eu/dnetlib/validator2/engine/XMLHelper.groovy b/src/test/groovy/eu/dnetlib/validator2/engine/XMLHelper.groovy
index aea8094..1eb1eb0 100644
--- a/src/test/groovy/eu/dnetlib/validator2/engine/XMLHelper.groovy
+++ b/src/test/groovy/eu/dnetlib/validator2/engine/XMLHelper.groovy
@@ -1,5 +1,6 @@
 package eu.dnetlib.validator2.engine
 
+import eu.dnetlib.validator2.engine.Helper
 import groovy.xml.DOMBuilder
 import groovy.xml.FactorySupport
 import org.w3c.dom.Document