diff --git a/xml/impl/src/com/intellij/codeInsight/completion/ExtendedTagInsertHandler.java b/xml/impl/src/com/intellij/codeInsight/completion/ExtendedTagInsertHandler.java
index 65b560a451f8..d935312f634e 100644
--- a/xml/impl/src/com/intellij/codeInsight/completion/ExtendedTagInsertHandler.java
+++ b/xml/impl/src/com/intellij/codeInsight/completion/ExtendedTagInsertHandler.java
@@ -134,8 +134,13 @@ public class ExtendedTagInsertHandler extends XmlTagInsertHandler {
     if (myNamespace == null) {
       return null;
     }
-    final XmlSchemaProvider provider = XmlSchemaProvider.getAvailableProvider(file);
-    return provider == null ? null : provider.getDefaultPrefix(myNamespace, file);
+    for (XmlSchemaProvider provider : XmlSchemaProvider.getAvailableProviders(file)) {
+      String prefix = provider.getDefaultPrefix(myNamespace, file);
+      if (prefix != null) {
+        return prefix;
+      }
+    }
+    return null; 
   }
 
   protected Set<String> getNamespaces(final XmlFile file) {
diff --git a/xml/impl/src/com/intellij/psi/impl/source/resolve/reference/impl/providers/URLReference.java b/xml/impl/src/com/intellij/psi/impl/source/resolve/reference/impl/providers/URLReference.java
index 4ccc5f9dc191..e8c65f185c38 100644
--- a/xml/impl/src/com/intellij/psi/impl/source/resolve/reference/impl/providers/URLReference.java
+++ b/xml/impl/src/com/intellij/psi/impl/source/resolve/reference/impl/providers/URLReference.java
@@ -11,10 +11,11 @@ import com.intellij.codeInsight.daemon.impl.HighlightInfo;
 import com.intellij.codeInsight.daemon.impl.quickfix.*;
 import com.intellij.javaee.ExternalResourceManager;
 import com.intellij.javaee.ExternalResourceManagerEx;
+import com.intellij.openapi.extensions.Extensions;
+import com.intellij.openapi.fileTypes.StdFileTypes;
 import com.intellij.openapi.util.TextRange;
 import com.intellij.openapi.vfs.VfsUtil;
 import com.intellij.openapi.vfs.VirtualFile;
-import com.intellij.openapi.fileTypes.StdFileTypes;
 import com.intellij.psi.*;
 import com.intellij.psi.util.PsiTreeUtil;
 import com.intellij.psi.xml.XmlAttribute;
@@ -32,6 +33,7 @@ import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
 import java.util.ArrayList;
+import java.util.HashSet;
 import java.util.Set;
 
 /**
@@ -180,12 +182,17 @@ public class URLReference implements PsiReference, QuickFixProvider, EmptyResolv
     return myElement.getManager().areElementsEquivalent(resolve(),element);
   }
 
+  @NotNull
   public Object[] getVariants() {
     final XmlFile file = (XmlFile)myElement.getContainingFile();
-    final XmlSchemaProvider provider = XmlSchemaProvider.getAvailableProvider(file);
-    if (provider != null) {
-      final Set<String> strings = provider.getAvailableNamespaces(file, null);
-      return ArrayUtil.toObjectArray(strings);
+    Set<String> list = new HashSet<String>();
+    for (XmlSchemaProvider provider : Extensions.getExtensions(XmlSchemaProvider.EP_NAME)) {
+      if (provider.isAvailable(file)) {
+        list.addAll(provider.getAvailableNamespaces(file, null));
+      }
+    }
+    if (!list.isEmpty()) {
+      return ArrayUtil.toObjectArray(list);
     }
     String[] resourceUrls = ExternalResourceManager.getInstance().getResourceUrls(null, true);
     final XmlDocument document = file.getDocument();
diff --git a/xml/impl/src/com/intellij/psi/impl/source/xml/XmlDoctypeImpl.java b/xml/impl/src/com/intellij/psi/impl/source/xml/XmlDoctypeImpl.java
index b1fd03fb051e..93640437e49b 100644
--- a/xml/impl/src/com/intellij/psi/impl/source/xml/XmlDoctypeImpl.java
+++ b/xml/impl/src/com/intellij/psi/impl/source/xml/XmlDoctypeImpl.java
@@ -195,9 +195,10 @@ public class XmlDoctypeImpl extends XmlElementImpl implements XmlDoctype, XmlEle
     if (dtdUrlElement != null) {
       uriRefs = new PsiReference[1];
       uriRefs[0] = new URLReference(XmlDoctypeImpl.this) {
+        @NotNull
         public Object[] getVariants() {
           return (docTypePublic != null)?
-                 super.getVariants(): PsiReference.EMPTY_ARRAY;
+                 super.getVariants(): EMPTY_ARRAY;
         }
         public String getCanonicalText() {
           return extractValue(dtdUrlElement);
diff --git a/xml/openapi/src/com/intellij/xml/XmlSchemaProvider.java b/xml/openapi/src/com/intellij/xml/XmlSchemaProvider.java
index a9c8a471cf9d..8f5704584595 100644
--- a/xml/openapi/src/com/intellij/xml/XmlSchemaProvider.java
+++ b/xml/openapi/src/com/intellij/xml/XmlSchemaProvider.java
@@ -20,16 +20,19 @@ import com.intellij.openapi.extensions.ExtensionPointName;
 import com.intellij.openapi.extensions.Extensions;
 import com.intellij.openapi.module.Module;
 import com.intellij.openapi.module.ModuleUtil;
-import com.intellij.openapi.project.DumbService;
 import com.intellij.openapi.project.DumbAware;
-import com.intellij.psi.PsiFile;
+import com.intellij.openapi.project.DumbService;
+import com.intellij.openapi.util.Condition;
 import com.intellij.psi.PsiDirectory;
+import com.intellij.psi.PsiFile;
 import com.intellij.psi.xml.XmlFile;
+import com.intellij.util.containers.ContainerUtil;
 import org.jetbrains.annotations.NonNls;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
 import java.util.Collections;
+import java.util.List;
 import java.util.Set;
 
 /**
@@ -66,6 +69,10 @@ public abstract class XmlSchemaProvider {
     return findSchema(url, module, baseFile);
   }
 
+  /**
+   * @see #getAvailableProviders(com.intellij.psi.xml.XmlFile)
+   */
+  @Deprecated
   @Nullable
   public static XmlSchemaProvider getAvailableProvider(final @NotNull XmlFile file) {
     for (XmlSchemaProvider provider: Extensions.getExtensions(EP_NAME)) {
@@ -76,6 +83,14 @@ public abstract class XmlSchemaProvider {
     return null;    
   }
 
+  public static List<XmlSchemaProvider> getAvailableProviders(final @NotNull XmlFile file) {
+    return ContainerUtil.findAll(Extensions.getExtensions(EP_NAME), new Condition<XmlSchemaProvider>() {
+      public boolean value(XmlSchemaProvider xmlSchemaProvider) {
+        return xmlSchemaProvider.isAvailable(file);
+      }
+    });
+  }
+
   @Nullable
   public abstract XmlFile getSchema(@NotNull @NonNls String url, @Nullable Module module, @NotNull final PsiFile baseFile);