diff --git a/src/main/java/es/elixir/bsc/json/schema/model/impl/AbstractJsonSchemaElement.java b/src/main/java/es/elixir/bsc/json/schema/model/impl/AbstractJsonSchemaElement.java
index e1b272d..55b6375 100644
--- a/src/main/java/es/elixir/bsc/json/schema/model/impl/AbstractJsonSchemaElement.java
+++ b/src/main/java/es/elixir/bsc/json/schema/model/impl/AbstractJsonSchemaElement.java
@@ -84,6 +84,7 @@ public String getJsonPointer() {
     public AbstractJsonSchemaElement getParent() {
         return parent;
     }
+    
 
     /**
      * This is a marker whether this element is in the dynamic scope and 
@@ -127,33 +128,22 @@ public Object clone() throws CloneNotSupportedException {
     }
     
     /**
-     * Predicate to clone provided element.
-     * Method just omits possible (impossible) CloneNotSupportedException.
+     * Predicate to create a clone of this element linked another parent.
      * 
-     * @param <T> returned type inferred from caller
-     * @param element the element to be cloned
+     * @param parent - the parent to be assigned to the cloned element
      * 
-     * @return the clone of provided element
+     * @return the clone of this element
      */
-    protected <T extends AbstractJsonSchemaElement> T clone(T element) {
-        if (element != null) {
+    protected AbstractJsonSchemaElement relink(AbstractJsonSchemaElement parent) {
+        if (this.parent != parent) {
             try {
-                return (T)element.clone();
-            } catch (CloneNotSupportedException ex) {}
+                AbstractJsonSchemaElement e = (AbstractJsonSchemaElement)this.clone();
+                e.parent = parent;
+                return e;
+            } catch (CloneNotSupportedException ex) {
+                return null;
+            }
         }
-        return null;
-    }
-    
-    /**
-     * Predicate used in streams to replace parent for this element
-     * 
-     * @param parent new parent for this element
-     * 
-     * @return affected element (this)
-     */
-    protected AbstractJsonSchemaElement setParent(AbstractJsonSchemaElement parent) {
-        this.parent = parent;
         return this;
     }
-
 }
diff --git a/src/main/java/es/elixir/bsc/json/schema/model/impl/BooleanJsonSchemaImpl.java b/src/main/java/es/elixir/bsc/json/schema/model/impl/BooleanJsonSchemaImpl.java
index a905adc..74c08bf 100644
--- a/src/main/java/es/elixir/bsc/json/schema/model/impl/BooleanJsonSchemaImpl.java
+++ b/src/main/java/es/elixir/bsc/json/schema/model/impl/BooleanJsonSchemaImpl.java
@@ -57,7 +57,7 @@ public BooleanJsonSchemaImpl(AbstractJsonSchemaElement parent,
     
     @Override
     public Stream<JsonSchemaElement> getChildren() {
-        return Stream.of();
+        return Stream.empty();
     }
 
     @Override
diff --git a/src/main/java/es/elixir/bsc/json/schema/model/impl/JsonArraySchemaImpl.java b/src/main/java/es/elixir/bsc/json/schema/model/impl/JsonArraySchemaImpl.java
index 48c4327..75ab910 100644
--- a/src/main/java/es/elixir/bsc/json/schema/model/impl/JsonArraySchemaImpl.java
+++ b/src/main/java/es/elixir/bsc/json/schema/model/impl/JsonArraySchemaImpl.java
@@ -84,8 +84,7 @@ public Stream<AbstractJsonSchemaElement> getChildren() {
                 Optional.ofNullable(items).map(Collection::stream).orElseGet(Stream::empty),
                 Stream.of(additionalItemsSchema, unevaluatedItemsSchema, contains)
                         .filter(Objects::nonNull))
-                        .map(this::clone)
-                        .map(c -> c.setParent(this));
+                        .map(c -> c.relink(this));
                         
         return Stream.concat(
                 super.getChildren(),
diff --git a/src/main/java/es/elixir/bsc/json/schema/model/impl/JsonDependentPropertiesImpl.java b/src/main/java/es/elixir/bsc/json/schema/model/impl/JsonDependentPropertiesImpl.java
index 03862b3..6a04a84 100644
--- a/src/main/java/es/elixir/bsc/json/schema/model/impl/JsonDependentPropertiesImpl.java
+++ b/src/main/java/es/elixir/bsc/json/schema/model/impl/JsonDependentPropertiesImpl.java
@@ -31,6 +31,7 @@
 import es.elixir.bsc.json.schema.ParsingError;
 import es.elixir.bsc.json.schema.ParsingMessage;
 import es.elixir.bsc.json.schema.model.JsonDependentProperties;
+import es.elixir.bsc.json.schema.model.JsonSchemaElement;
 import es.elixir.bsc.json.schema.model.StringArray;
 import javax.json.JsonObject;
 import javax.json.JsonValue;
@@ -55,8 +56,8 @@ public JsonDependentPropertiesImpl(AbstractJsonSchema parent,
     }
     
     @Override
-    public Stream<AbstractJsonSchemaElement> getChildren() {
-        return Stream.empty(); // TODO
+    public <T extends JsonSchemaElement> Stream<T> getChildren() {
+        return Stream.empty();
     }
 
     @Override
diff --git a/src/main/java/es/elixir/bsc/json/schema/model/impl/JsonDynamicReferenceImpl.java b/src/main/java/es/elixir/bsc/json/schema/model/impl/JsonDynamicReferenceImpl.java
index a4f939d..109740b 100644
--- a/src/main/java/es/elixir/bsc/json/schema/model/impl/JsonDynamicReferenceImpl.java
+++ b/src/main/java/es/elixir/bsc/json/schema/model/impl/JsonDynamicReferenceImpl.java
@@ -102,7 +102,7 @@ private AbstractJsonSchemaElement getSchema(AbstractJsonSchemaElement e, URI uri
         if (value instanceof JsonObject jsubschema) {
             final String anchor = jsubschema.getString(DYNAMIC_ANCHOR, null);
             if (fragment.equals(anchor)) {
-                return parser.parse(l, getParent(), e.getJsonPointer(), jsubschema, null);
+                return parser.parse(l, this, e.getJsonPointer(), jsubschema, null);
             }
         }
         return null;
diff --git a/src/main/java/es/elixir/bsc/json/schema/model/impl/JsonMultitypeSchemaWrapper.java b/src/main/java/es/elixir/bsc/json/schema/model/impl/JsonMultitypeSchemaWrapper.java
index 60463b0..16f7ac1 100644
--- a/src/main/java/es/elixir/bsc/json/schema/model/impl/JsonMultitypeSchemaWrapper.java
+++ b/src/main/java/es/elixir/bsc/json/schema/model/impl/JsonMultitypeSchemaWrapper.java
@@ -68,8 +68,7 @@ public Stream<AbstractJsonSchemaElement> getChildren() {
         return StreamSupport.stream(
                 Spliterators.spliteratorUnknownSize(iterator(), Spliterator.ORDERED),false)
                 .filter(s -> s instanceof JsonObjectSchema || s instanceof JsonArraySchema)
-                .map(this::clone)
-                .map(c -> c.setParent(this))
+                .map(c -> c.relink(this))
                 .flatMap(JsonSchemaElement::getChildren);
     }
     
diff --git a/src/main/java/es/elixir/bsc/json/schema/model/impl/JsonNotImpl.java b/src/main/java/es/elixir/bsc/json/schema/model/impl/JsonNotImpl.java
index 3a78e1e..8685bae 100644
--- a/src/main/java/es/elixir/bsc/json/schema/model/impl/JsonNotImpl.java
+++ b/src/main/java/es/elixir/bsc/json/schema/model/impl/JsonNotImpl.java
@@ -53,7 +53,7 @@ public JsonNotImpl(AbstractJsonSchema parent,
     
     @Override
     public Stream<AbstractJsonSchemaElement> getChildren() {
-        return schema.clone(schema).setParent(this).getChildren();
+        return schema.relink(this).getChildren();
     }
     
     @Override
diff --git a/src/main/java/es/elixir/bsc/json/schema/model/impl/JsonNumberSchemaImpl.java b/src/main/java/es/elixir/bsc/json/schema/model/impl/JsonNumberSchemaImpl.java
index 7af4152..d780f13 100644
--- a/src/main/java/es/elixir/bsc/json/schema/model/impl/JsonNumberSchemaImpl.java
+++ b/src/main/java/es/elixir/bsc/json/schema/model/impl/JsonNumberSchemaImpl.java
@@ -92,7 +92,7 @@ public boolean validate(String jsonPointer, JsonValue value, JsonValue parent,
         
         return nerrors == errors.size();
     }
-    
+
     private void validate(String jsonPointer, BigDecimal dec, List<ValidationError> errors) {
 
         if (minimum != null) {
diff --git a/src/main/java/es/elixir/bsc/json/schema/model/impl/JsonObjectSchemaImpl.java b/src/main/java/es/elixir/bsc/json/schema/model/impl/JsonObjectSchemaImpl.java
index cafc2e1..964dee7 100644
--- a/src/main/java/es/elixir/bsc/json/schema/model/impl/JsonObjectSchemaImpl.java
+++ b/src/main/java/es/elixir/bsc/json/schema/model/impl/JsonObjectSchemaImpl.java
@@ -86,8 +86,8 @@ public Stream<AbstractJsonSchemaElement> getChildren() {
         final Stream<AbstractJsonSchemaElement> children = Stream.of(
                 properties, propertyNames, patternProperties,
                 unevaluatedPropertiesSchema, dependentSchemas)
-                .filter(Objects::nonNull).map(this::clone)
-                .map(c -> c.setParent(this));
+                .filter(Objects::nonNull)
+                .map(c -> c.relink(this));
 
         return Stream.concat(
                 super.getChildren(),
diff --git a/src/main/java/es/elixir/bsc/json/schema/model/impl/JsonPropertiesImpl.java b/src/main/java/es/elixir/bsc/json/schema/model/impl/JsonPropertiesImpl.java
index a498406..5837445 100644
--- a/src/main/java/es/elixir/bsc/json/schema/model/impl/JsonPropertiesImpl.java
+++ b/src/main/java/es/elixir/bsc/json/schema/model/impl/JsonPropertiesImpl.java
@@ -29,6 +29,7 @@
 import es.elixir.bsc.json.schema.JsonSchemaLocator;
 import es.elixir.bsc.json.schema.impl.JsonSubschemaParser;
 import es.elixir.bsc.json.schema.model.JsonProperties;
+import es.elixir.bsc.json.schema.model.JsonSchemaElement;
 import java.util.Iterator;
 import java.util.LinkedHashMap;
 import java.util.Map;
@@ -55,7 +56,7 @@ public JsonPropertiesImpl(AbstractJsonSchema parent,
     public Stream<AbstractJsonSchemaElement> getChildren() {
         // clone properties and set their parent to 'this'
         final Stream<AbstractJsonSchemaElement> children =
-                properties.values().stream().map(this::clone).map(c -> c.setParent(this));
+                properties.values().stream().map(c -> c.relink(this));
         
         return children.flatMap(p -> Stream.concat(Stream.of(p), p.getChildren()));
     }
diff --git a/src/main/java/es/elixir/bsc/json/schema/model/impl/JsonRecursiveReferenceImpl.java b/src/main/java/es/elixir/bsc/json/schema/model/impl/JsonRecursiveReferenceImpl.java
index 6f0160d..239919b 100644
--- a/src/main/java/es/elixir/bsc/json/schema/model/impl/JsonRecursiveReferenceImpl.java
+++ b/src/main/java/es/elixir/bsc/json/schema/model/impl/JsonRecursiveReferenceImpl.java
@@ -48,7 +48,7 @@ public class JsonRecursiveReferenceImpl extends AbstractJsonReferenceImpl
     public JsonRecursiveReferenceImpl(AbstractJsonSchemaElement parent, 
             JsonSchemaLocator scope, JsonSchemaLocator locator, String jsonPointer) {
         super(parent, scope, locator, jsonPointer);
-
+        
         AbstractJsonSchemaElement e = this;
         do {
             e.setDynamicScope(true);
diff --git a/src/main/java/es/elixir/bsc/json/schema/model/impl/JsonReferenceImpl.java b/src/main/java/es/elixir/bsc/json/schema/model/impl/JsonReferenceImpl.java
index d576c73..018a095 100644
--- a/src/main/java/es/elixir/bsc/json/schema/model/impl/JsonReferenceImpl.java
+++ b/src/main/java/es/elixir/bsc/json/schema/model/impl/JsonReferenceImpl.java
@@ -55,18 +55,18 @@ public Stream<AbstractJsonSchemaElement> getChildren() {
             while (s != null) {
                 if (ref_locator.uri.equals(s.getId()) &&
                     ref_pointer.equals(s.getJsonPointer())) {
-                    return Stream.empty(); // cyclic ref
+                    return Stream.of(); // cyclic ref
                 }
                 s = s.getParent();
             }
             try {
                 schema = getSchema();
             } catch(JsonSchemaException ex) {
-                return Stream.empty(); // unresolvable ref
+                return Stream.of(); // unresolvable ref
             }
         }
         
-        return schema.clone(schema).setParent(this).getChildren();
+        return schema.relink(this).getChildren();
     }
 
     @Override
@@ -79,7 +79,7 @@ public AbstractJsonSchemaElement getSchema() throws JsonSchemaException {
                             new ParsingError(ParsingMessage.UNRESOLVABLE_REFERENCE, ref));
                 }
 
-                schema = parser.parse(ref_locator, getParent(), ref_pointer, jsubschema, null);
+                schema = parser.parse(ref_locator, this, ref_pointer, jsubschema, null);
             } catch(IOException | JsonException | IllegalArgumentException ex) {
                 throw new JsonSchemaException(
                     new ParsingError(ParsingMessage.INVALID_REFERENCE, ref));
diff --git a/src/main/java/es/elixir/bsc/json/schema/model/impl/PrimitiveSchemaImpl.java b/src/main/java/es/elixir/bsc/json/schema/model/impl/PrimitiveSchemaImpl.java
index 124f73b..8a03669 100644
--- a/src/main/java/es/elixir/bsc/json/schema/model/impl/PrimitiveSchemaImpl.java
+++ b/src/main/java/es/elixir/bsc/json/schema/model/impl/PrimitiveSchemaImpl.java
@@ -93,8 +93,7 @@ public Stream<AbstractJsonSchemaElement> getChildren() {
         final Stream<AbstractJsonSchemaElement> children =
                 Stream.of(allOf, anyOf, oneOf, not, _if, _then, _else, ref)
                         .filter(Objects::nonNull)
-                        .map(this::clone)
-                        .map(c -> c.setParent(this));
+                        .map(c -> c.relink(this));
         
         return children.flatMap(AbstractJsonSchemaElement::getChildren);
     }
diff --git a/src/main/java/es/elixir/bsc/json/schema/model/impl/SchemaArrayImpl.java b/src/main/java/es/elixir/bsc/json/schema/model/impl/SchemaArrayImpl.java
index 1dc467c..4c0d178 100644
--- a/src/main/java/es/elixir/bsc/json/schema/model/impl/SchemaArrayImpl.java
+++ b/src/main/java/es/elixir/bsc/json/schema/model/impl/SchemaArrayImpl.java
@@ -59,7 +59,7 @@ public SchemaArrayImpl(AbstractJsonSchemaElement parent,
     public Stream<AbstractJsonSchemaElement> getChildren() {
         // clone array schemas and set their parent to 'this'
         final Stream<AbstractJsonSchemaElement> children =
-                schemas.stream().map(this::clone).map(c -> c.setParent(this));
+                schemas.stream().map(c -> c.relink(this));
 
         return children.flatMap(e -> Stream.concat(Stream.of(e), e.getChildren()));
     }