diff --git a/scim-core/src/main/java/org/apache/directory/scim/core/repository/ScimRequestContext.java b/scim-core/src/main/java/org/apache/directory/scim/core/repository/ScimRequestContext.java
index a6a85c57..d12fe268 100644
--- a/scim-core/src/main/java/org/apache/directory/scim/core/repository/ScimRequestContext.java
+++ b/scim-core/src/main/java/org/apache/directory/scim/core/repository/ScimRequestContext.java
@@ -27,6 +27,7 @@
 import java.util.Objects;
 import java.util.Optional;
 import java.util.Set;
+import java.util.stream.Collectors;
 
 public class ScimRequestContext {
 
@@ -163,4 +164,55 @@ public String toString() {
   public static ScimRequestContext empty() {
     return new ScimRequestContext();
   }
+
+  /**
+   * Returns the fully qualified SCIM attribute names the client explicitly requested
+   * via the {@code attributes} query parameter, or an empty set if no specific
+   * attributes were requested (meaning all attributes should be returned).
+   *
+   * <p>All attribute names are returned in their fully qualified form
+   * (e.g., {@code urn:ietf:params:scim:schemas:core:2.0:User:userName}).
+   * The server layer normalizes unqualified attribute references before they
+   * reach the repository, so all references in this context carry their schema URN.</p>
+   *
+   * <p>Repository implementations MAY use this to optimize backend queries
+   * (e.g., selecting specific LDAP attributes or database columns). The SCIM server
+   * layer always applies attribute filtering post-retrieval as a safety net, so
+   * repositories that ignore this hint will still produce correct results.</p>
+   *
+   * @return set of fully qualified SCIM attribute names, or empty for "all"
+   * @see #getIncludedAttributes()
+   */
+  public Set<String> getIncludedAttributeNames() {
+    if (includedAttributes == null) {
+      return Set.of();
+    }
+    return includedAttributes.stream()
+      .map(AttributeReference::getFullyQualifiedAttributeName)
+      .collect(Collectors.toUnmodifiableSet());
+  }
+
+  /**
+   * Returns the fully qualified SCIM attribute names the client explicitly excluded
+   * via the {@code excludedAttributes} query parameter, or an empty set if none
+   * were excluded.
+   *
+   * <p>Attribute names follow the same fully qualified rules as
+   * {@link #getIncludedAttributeNames()}.</p>
+   *
+   * <p>Repository implementations MAY use this to optimize backend queries by
+   * omitting excluded attributes from the fetch. The SCIM server layer always
+   * applies attribute filtering post-retrieval as a safety net.</p>
+   *
+   * @return set of fully qualified excluded SCIM attribute names, or empty for "none excluded"
+   * @see #getExcludedAttributes()
+   */
+  public Set<String> getExcludedAttributeNames() {
+    if (excludedAttributes == null) {
+      return Set.of();
+    }
+    return excludedAttributes.stream()
+      .map(AttributeReference::getFullyQualifiedAttributeName)
+      .collect(Collectors.toUnmodifiableSet());
+  }
 }
diff --git a/scim-core/src/test/java/org/apache/directory/scim/core/repository/ScimRequestContextTest.java b/scim-core/src/test/java/org/apache/directory/scim/core/repository/ScimRequestContextTest.java
new file mode 100644
index 00000000..241f95d9
--- /dev/null
+++ b/scim-core/src/test/java/org/apache/directory/scim/core/repository/ScimRequestContextTest.java
@@ -0,0 +1,113 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+
+ * http://www.apache.org/licenses/LICENSE-2.0
+
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.directory.scim.core.repository;
+
+import org.apache.directory.scim.spec.filter.attribute.AttributeReference;
+import org.junit.jupiter.api.Test;
+
+import java.util.Set;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class ScimRequestContextTest {
+
+  static final String USER_SCHEMA = "urn:ietf:params:scim:schemas:core:2.0:User";
+  static final String ENTERPRISE_SCHEMA = "urn:ietf:params:scim:schemas:extension:enterprise:2.0:User";
+
+  // --- getIncludedAttributeNames ---
+
+  @Test
+  void getIncludedAttributeNames_returnsFullyQualifiedNames() {
+    // Server layer normalizes references before they reach the repository,
+    // so all references should have URNs by this point
+    AttributeReference ref1 = new AttributeReference(USER_SCHEMA + ":userName");
+    AttributeReference ref2 = new AttributeReference(USER_SCHEMA + ":emails");
+    ScimRequestContext ctx = new ScimRequestContext(Set.of(ref1, ref2), Set.of());
+
+    Set<String> names = ctx.getIncludedAttributeNames();
+
+    assertThat(names).containsExactlyInAnyOrder(
+      USER_SCHEMA + ":userName",
+      USER_SCHEMA + ":emails"
+    );
+  }
+
+  @Test
+  void getIncludedAttributeNames_extensionAttributesPreserveTheirUrn() {
+    AttributeReference coreAttr = new AttributeReference(USER_SCHEMA + ":userName");
+    AttributeReference extensionAttr = new AttributeReference(ENTERPRISE_SCHEMA + ":department");
+    ScimRequestContext ctx = new ScimRequestContext(Set.of(coreAttr, extensionAttr), Set.of());
+
+    Set<String> names = ctx.getIncludedAttributeNames();
+
+    assertThat(names).containsExactlyInAnyOrder(
+      USER_SCHEMA + ":userName",
+      ENTERPRISE_SCHEMA + ":department"
+    );
+  }
+
+  @Test
+  void getIncludedAttributeNames_subAttributeIncluded() {
+    AttributeReference ref = new AttributeReference(USER_SCHEMA + ":name.givenName");
+    ScimRequestContext ctx = new ScimRequestContext(Set.of(ref), Set.of());
+
+    assertThat(ctx.getIncludedAttributeNames())
+      .containsExactly(USER_SCHEMA + ":name.givenName");
+  }
+
+  @Test
+  void getIncludedAttributeNames_emptyReturnsEmptySet() {
+    ScimRequestContext ctx = new ScimRequestContext(Set.of(), Set.of());
+    assertThat(ctx.getIncludedAttributeNames()).isEmpty();
+  }
+
+  @Test
+  void getIncludedAttributeNames_nullReturnsEmptySet() {
+    ScimRequestContext ctx = new ScimRequestContext();
+    ctx.setIncludedAttributes(null);
+    assertThat(ctx.getIncludedAttributeNames()).isEmpty();
+  }
+
+  // --- getExcludedAttributeNames ---
+
+  @Test
+  void getExcludedAttributeNames_returnsFullyQualifiedNames() {
+    AttributeReference ref = new AttributeReference(USER_SCHEMA + ":password");
+    ScimRequestContext ctx = new ScimRequestContext(Set.of(), Set.of(ref));
+
+    assertThat(ctx.getExcludedAttributeNames())
+      .containsExactly(USER_SCHEMA + ":password");
+  }
+
+  @Test
+  void getExcludedAttributeNames_emptyReturnsEmptySet() {
+    ScimRequestContext ctx = new ScimRequestContext(Set.of(), Set.of());
+    assertThat(ctx.getExcludedAttributeNames()).isEmpty();
+  }
+
+  // --- empty() ---
+
+  @Test
+  void empty_returnsEmptySetsForBothIncludedAndExcluded() {
+    ScimRequestContext ctx = ScimRequestContext.empty();
+    assertThat(ctx.getIncludedAttributeNames()).isEmpty();
+    assertThat(ctx.getExcludedAttributeNames()).isEmpty();
+  }
+}
diff --git a/scim-server/src/main/java/org/apache/directory/scim/server/rest/BaseResourceTypeResourceImpl.java b/scim-server/src/main/java/org/apache/directory/scim/server/rest/BaseResourceTypeResourceImpl.java
index d46a332e..3b4d9796 100644
--- a/scim-server/src/main/java/org/apache/directory/scim/server/rest/BaseResourceTypeResourceImpl.java
+++ b/scim-server/src/main/java/org/apache/directory/scim/server/rest/BaseResourceTypeResourceImpl.java
@@ -26,6 +26,7 @@
 import java.util.Optional;
 import java.util.Objects;
 import java.util.Set;
+import java.util.stream.Collectors;
 
 import jakarta.enterprise.inject.spi.CDI;
 import jakarta.ws.rs.core.*;
@@ -57,6 +58,8 @@
 import org.apache.directory.scim.protocol.data.SearchRequest;
 import org.apache.directory.scim.spec.filter.FilterResponse;
 import org.apache.directory.scim.spec.filter.Filter;
+import org.apache.directory.scim.spec.schema.ResourceType;
+import org.apache.directory.scim.spec.schema.Schema;
 import org.apache.directory.scim.spec.filter.SortOrder;
 import org.apache.directory.scim.core.repository.ScimRequestContext;
 import org.apache.directory.scim.spec.resources.ScimResource;
@@ -67,6 +70,8 @@ public abstract class BaseResourceTypeResourceImpl<T extends ScimResource> imple
 
   private final RepositoryRegistry repositoryRegistry;
 
+  private final SchemaRegistry schemaRegistry;
+
   private final AttributeUtil attributeUtil;
 
   private final Class<T> resourceClass;
@@ -83,6 +88,7 @@ public abstract class BaseResourceTypeResourceImpl<T extends ScimResource> imple
   HttpHeaders headers;
 
   public BaseResourceTypeResourceImpl(SchemaRegistry schemaRegistry, RepositoryRegistry repositoryRegistry, Class<T> resourceClass) {
+    this.schemaRegistry = schemaRegistry;
     this.repositoryRegistry = repositoryRegistry;
     this.resourceClass = resourceClass;
     this.attributeUtil = new AttributeUtil(schemaRegistry);
@@ -109,6 +115,8 @@ public Response getById(String id, AttributeReferenceListWrapper attributes, Att
     Set<AttributeReference> attributeReferences = AttributeReferenceListWrapper.getAttributeReferences(attributes);
     Set<AttributeReference> excludedAttributeReferences = AttributeReferenceListWrapper.getAttributeReferences(excludedAttributes);
     validateAttributes(attributeReferences, excludedAttributeReferences);
+    attributeReferences = qualifyReferences(attributeReferences);
+    excludedAttributeReferences = qualifyReferences(excludedAttributeReferences);
 
     Repository<T> repository = getRepositoryInternal();
 
@@ -172,6 +180,8 @@ public Response create(T resource, AttributeReferenceListWrapper attributes, Att
     Set<AttributeReference> attributeReferences = AttributeReferenceListWrapper.getAttributeReferences(attributes);
     Set<AttributeReference> excludedAttributeReferences = AttributeReferenceListWrapper.getAttributeReferences(excludedAttributes);
     validateAttributes(attributeReferences, excludedAttributeReferences);
+    attributeReferences = qualifyReferences(attributeReferences);
+    excludedAttributeReferences = qualifyReferences(excludedAttributeReferences);
 
     T created = repository.create(resource, new ScimRequestContext(attributeReferences, excludedAttributeReferences, null, null, null));
 
@@ -207,6 +217,8 @@ public Response find(SearchRequest request) throws ScimException, ResourceExcept
     Set<AttributeReference> excludedAttributeReferences = Optional.ofNullable(request.getExcludedAttributes())
                                                                   .orElse(Collections.emptySet());
     validateAttributes(attributeReferences, excludedAttributeReferences);
+    attributeReferences = qualifyReferences(attributeReferences);
+    excludedAttributeReferences = qualifyReferences(excludedAttributeReferences);
 
     Filter filter = request.getFilter();
     ScimRequestContext requestContext = new ScimRequestContext(attributeReferences, excludedAttributeReferences, request.getPageRequest(),  request.getSortRequest(), null);
@@ -273,6 +285,8 @@ private Response update(AttributeReferenceListWrapper attributes, AttributeRefer
     Set<AttributeReference> attributeReferences = AttributeReferenceListWrapper.getAttributeReferences(attributes);
     Set<AttributeReference> excludedAttributeReferences = AttributeReferenceListWrapper.getAttributeReferences(excludedAttributes);
     validateAttributes(attributeReferences, excludedAttributeReferences);
+    attributeReferences = qualifyReferences(attributeReferences);
+    excludedAttributeReferences = qualifyReferences(excludedAttributeReferences);
 
     String requestEtag = headers.getHeaderString("If-Match");
     Set<ETag> etags = EtagParser.parseETag(requestEtag);
@@ -368,6 +382,55 @@ private EntityTag fromVersion(ScimResource resource) {
     return null;
   }
 
+  /**
+   * Normalizes {@link AttributeReference} objects to their fully qualified form by
+   * resolving unqualified attribute names against the base schema and extension schemas
+   * for this resource type. References that already have a URN are returned as-is.
+   */
+  private Set<AttributeReference> qualifyReferences(Set<AttributeReference> refs) {
+    if (refs == null || refs.isEmpty()) {
+      return refs;
+    }
+
+    org.apache.directory.scim.spec.annotation.ScimResourceType annotation =
+      resourceClass.getAnnotation(org.apache.directory.scim.spec.annotation.ScimResourceType.class);
+    if (annotation == null) {
+      return refs;
+    }
+
+    ResourceType resourceType = schemaRegistry.getResourceType(annotation.name());
+    if (resourceType == null) {
+      return refs;
+    }
+
+    Schema baseSchema = schemaRegistry.getSchema(resourceType.getSchemaUrn());
+
+    return refs.stream()
+      .map(ref -> {
+        if (ref.isFullyQualified()) {
+          return ref;
+        }
+
+        // Try base schema first
+        if (baseSchema != null && baseSchema.getAttribute(ref.getAttributeName()) != null) {
+          return new AttributeReference(baseSchema.getId(), ref.getFullAttributeName());
+        }
+
+        // Try extension schemas
+        if (resourceType.getSchemaExtensions() != null) {
+          for (ResourceType.SchemaExtensionConfiguration ext : resourceType.getSchemaExtensions()) {
+            Schema extSchema = schemaRegistry.getSchema(ext.getSchemaUrn());
+            if (extSchema != null && extSchema.getAttribute(ref.getAttributeName()) != null) {
+              return new AttributeReference(extSchema.getId(), ref.getFullAttributeName());
+            }
+          }
+        }
+
+        return ref; // best-effort: leave unresolved
+      })
+      .collect(Collectors.toUnmodifiableSet());
+  }
+
   @FunctionalInterface
   private interface UpdateFunction<T extends ScimResource> {
     T update(ScimRequestContext requestContext, Repository<T> repository) throws ResourceException;
diff --git a/scim-spec/scim-spec-schema/src/main/java/org/apache/directory/scim/spec/filter/attribute/AttributeReference.java b/scim-spec/scim-spec-schema/src/main/java/org/apache/directory/scim/spec/filter/attribute/AttributeReference.java
index 1091478e..2049dbbe 100644
--- a/scim-spec/scim-spec-schema/src/main/java/org/apache/directory/scim/spec/filter/attribute/AttributeReference.java
+++ b/scim-spec/scim-spec-schema/src/main/java/org/apache/directory/scim/spec/filter/attribute/AttributeReference.java
@@ -118,10 +118,28 @@ public boolean hasSubAttribute() {
     return subAttributeName != null;
   }
 
-  public boolean hasUrn() {
+  /**
+   * Returns {@code true} if this reference includes a schema URN prefix,
+   * making it unambiguous across schemas.
+   *
+   * <p>Extension attributes are always fully qualified since their names
+   * are only meaningful with the schema URN. Core attributes may or may
+   * not be, depending on how the client sent them.</p>
+   *
+   * @return {@code true} if the URN is present
+   */
+  public boolean isFullyQualified() {
     return urn != null;
   }
 
+  /**
+   * @deprecated Use {@link #isFullyQualified()} instead.
+   */
+  @Deprecated
+  public boolean hasUrn() {
+    return isFullyQualified();
+  }
+
   public String toString() {
     return (this.urn != null ? this.urn + ":" : "") + this.attributeName + (this.subAttributeName != null ? "." + this.subAttributeName : "");
   }