remove deprecated constants

Signed-off-by: Lukas Jungmann <lukas.jungmann@oracle.com>
diff --git a/jaxb-ri/core/src/main/java/org/glassfish/jaxb/core/v2/WellKnownNamespace.java b/jaxb-ri/core/src/main/java/org/glassfish/jaxb/core/v2/WellKnownNamespace.java
index 2bec113..380acf7 100644
--- a/jaxb-ri/core/src/main/java/org/glassfish/jaxb/core/v2/WellKnownNamespace.java
+++ b/jaxb-ri/core/src/main/java/org/glassfish/jaxb/core/v2/WellKnownNamespace.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2021 Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2022 Oracle and/or its affiliates. All rights reserved.
  *
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Distribution License v. 1.0, which is available at
@@ -10,8 +10,6 @@
 
 package org.glassfish.jaxb.core.v2;
 
-import javax.xml.XMLConstants;
-
 /**
  * Well-known namespace URIs.
  * @author
@@ -21,24 +19,6 @@
 public abstract class WellKnownNamespace {
     private WellKnownNamespace() {} // no instanciation please
 
-    /**
-     * @deprecated Use javax.xml.XMLConstants.W3C_XML_SCHEMA_NS_URI instead;
-     */
-    @Deprecated()
-    public static final String XML_SCHEMA = XMLConstants.W3C_XML_SCHEMA_NS_URI;
-
-    /**
-     * @deprecated Use javax.xml.XMLConstants.W3C_XML_SCHEMA_INSTANCE_NS_URI instead
-     */
-    @Deprecated()
-    public static final String XML_SCHEMA_INSTANCE = XMLConstants.W3C_XML_SCHEMA_INSTANCE_NS_URI;
-
-    /**
-     * @deprecated Use javax.xml.XMLConstants.XML_NS_URI instead;
-     */
-    @Deprecated()
-    public static final String XML_NAMESPACE_URI = XMLConstants.XML_NS_URI;
-
     public static final String XOP = "http://www.w3.org/2004/08/xop/include";
 
     public static final String SWA_URI = "http://ws-i.org/profiles/basic/1.1/xsd";
diff --git a/jaxb-ri/runtime/impl/src/main/java/org/glassfish/jaxb/runtime/v2/runtime/XMLSerializer.java b/jaxb-ri/runtime/impl/src/main/java/org/glassfish/jaxb/runtime/v2/runtime/XMLSerializer.java
index 8226959..cd22dba 100644
--- a/jaxb-ri/runtime/impl/src/main/java/org/glassfish/jaxb/runtime/v2/runtime/XMLSerializer.java
+++ b/jaxb-ri/runtime/impl/src/main/java/org/glassfish/jaxb/runtime/v2/runtime/XMLSerializer.java
@@ -745,9 +745,9 @@
      * Short for the following call sequence:
      *
      * <pre>
-         getNamespaceContext().declareNamespace(WellKnownNamespace.XML_SCHEMA_INSTANCE,"xsi",true);
+         getNamespaceContext().declareNamespace(XMLConstants.W3C_XML_SCHEMA_INSTANCE_NS_URI,"xsi",true);
          endNamespaceDecls();
-         attribute(WellKnownNamespace.XML_SCHEMA_INSTANCE,"nil","true");
+         attribute(XMLConstants.W3C_XML_SCHEMA_INSTANCE_NS_URI,"nil","true");
          endAttributes();
      * </pre>
      */