diff --git a/src/Validator/SchemaValidatorV2.php b/src/Validator/SchemaValidatorV2.php
new file mode 100644
index 0000000..82f92fa
--- /dev/null
+++ b/src/Validator/SchemaValidatorV2.php
@@ -0,0 +1,171 @@
+<?php
+
+namespace Tmilos\ScimSchema\Validator;
+
+use Tmilos\ScimSchema\Helper;
+use Tmilos\ScimSchema\Model\Schema\Attribute;
+use Tmilos\ScimSchema\Model\Schema;
+use Tmilos\ScimSchema\ScimConstants;
+
+class SchemaValidatorV2
+{
+    private static array $commonAttributes = [
+        'id' => 1,
+        'schemas' => 1,
+        'externalId' => 1,
+        'meta' => 1,
+    ];
+
+    /**
+     * @param Schema[] $schemaExtensions
+     */
+    public function validate(array $object, Schema $schema, array $schemaExtensions = []): ValidationResult
+    {
+        $validationResult = new ValidationResult();
+        /** @var Schema[] $otherSchemas */
+        $otherSchemas = [];
+        foreach ($schemaExtensions as $schemaExtension) {
+            $otherSchemas[$schemaExtension->getId()] = $schemaExtension;
+        }
+
+        $this->validateByAttributes(
+            $object,
+            $schema->getId(),
+            $schema->getAttributes(),
+            $otherSchemas,
+            $validationResult,
+            null,
+        );
+
+        foreach ($otherSchemas as $schemaId => $otherSchema) {
+            if (isset($object[$schemaId])) {
+                $this->validateByAttributes(
+                    $object[$schemaId],
+                    $otherSchema->getId(),
+                    $otherSchema->getAttributes(),
+                    [],
+                    $validationResult,
+                    null,
+                );
+            }
+        }
+
+        return $validationResult;
+    }
+
+    /**
+     * @param Attribute[] $attributes
+     */
+    private function validateByAttributes(
+        array $object,
+        string $schemaId,
+        array $attributes,
+        array $ignoreAttributes,
+        ValidationResult $validationResult,
+        ?string $parentPath,
+    ): void {
+        foreach ($object as $propertyName => $value) {
+            if ($parentPath === null && isset(self::$commonAttributes[$propertyName])) {
+                // skip common resource attributes
+                continue;
+            }
+            if ($parentPath === null && isset($ignoreAttributes[$propertyName])) {
+                continue;
+            }
+
+            $attribute = Helper::findAttribute($propertyName, $attributes);
+            if (!$attribute) {
+                continue;
+            }
+
+            if ($attribute->isRequired() === false && $value === null) {
+                continue;
+            }
+
+            if ($this->isArray($value)) {
+                if (!$attribute->isMultiValued()) {
+                    $validationResult->add(
+                        $propertyName,
+                        $parentPath,
+                        $schemaId,
+                        'Attribute is not defined in schema as multi-valued, but got array',
+                    );
+                    continue;
+                } else {
+                    foreach ($value as $item) {
+                        $this->validateByAttributes(
+                            $item,
+                            $schemaId,
+                            $attribute->getSubAttributes(),
+                            [],
+                            $validationResult,
+                            $propertyName,
+                        );
+                    }
+                }
+            } elseif ($this->isObject($value)) {
+                if ($attribute->isMultiValued()) {
+                    $validationResult->add(
+                        $propertyName,
+                        $parentPath,
+                        $schemaId,
+                        'Attribute is defined in schema as multi-valued, but got object',
+                    );
+                    continue;
+                } elseif ($attribute->getType() !== ScimConstants::ATTRIBUTE_TYPE_COMPLEX) {
+                    $validationResult->add(
+                        $propertyName,
+                        $parentPath,
+                        $schemaId,
+                        'Attribute is not defined in schema as complex, but got object',
+                    );
+                    continue;
+                }
+                $this->validateByAttributes(
+                    $value,
+                    $schemaId,
+                    $attribute->getSubAttributes(),
+                    [],
+                    $validationResult,
+                    $propertyName,
+                );
+            } else {
+                if ($attribute->isMultiValued()) {
+                    $validationResult->add(
+                        $propertyName,
+                        $parentPath,
+                        $schemaId,
+                        'Attribute is defined in schema as multi-valued, but got scalar',
+                    );
+                    continue;
+                } elseif ($attribute->getType() === ScimConstants::ATTRIBUTE_TYPE_COMPLEX) {
+                    $validationResult->add(
+                        $propertyName,
+                        $parentPath,
+                        $schemaId,
+                        'Attribute is defined in schema as complex, but got scalar',
+                    );
+                    continue;
+                } elseif (!$attribute->isValueValid($value)) {
+                    $validationResult->add(
+                        $propertyName,
+                        $parentPath,
+                        $schemaId,
+                        sprintf('Attribute has invalid value for type "%s"', $attribute->getType()),
+                    );
+                    continue;
+                }
+            }
+        }
+    }
+
+    private function isArray(mixed $value): bool
+    {
+        return is_array($value) && Helper::hasAllIntKeys($value);
+    }
+
+    private function isObject(mixed $value): bool
+    {
+        return is_array($value) && Helper::hasAllStringKeys($value);
+    }
+}
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