antlib: is a magic name

src/main/org/apache/tools/ant/ComponentHelper.java

@@ -824,7 +824,7 @@ public class ComponentHelper  {
         if (uri.isEmpty()) {
             uri = ProjectHelper.ANT_CORE_URI;
         }
-        if (!uri.startsWith(ProjectHelper.ANTLIB_URI)) {
+        if (!uri.startsWith(MagicNames.ANTLIB_PREFIX)) {
             return; // namespace that does not contain antlib
         }
         if (checkedNamespaces.contains(uri)) {

src/main/org/apache/tools/ant/ProjectHelper.java

@@ -38,7 +38,7 @@ import org.xml.sax.AttributeList;
  */
 public class ProjectHelper {
     /** The URI for ant name space */
-    public static final String ANT_CORE_URI    = "antlib:org.apache.tools.ant";
+    public static final String ANT_CORE_URI = MagicNames.ANTLIB_PREFIX + "org.apache.tools.ant";
 
     /** The URI for antlib current definitions */
     public static final String ANT_CURRENT_URI      = "ant:current";
@@ -49,7 +49,7 @@ public class ProjectHelper {
     public static final String ANT_ATTRIBUTE_URI      = "ant:attribute";
 
     /** The URI for defined types/tasks - the format is antlib:<package> */
-    public static final String ANTLIB_URI     = "antlib:";
+    public static final String ANTLIB_URI = MagicNames.ANTLIB_PREFIX;
 
     /** Polymorphic attribute  */
     public static final String ANT_TYPE = "ant-type";

src/main/org/apache/tools/ant/taskdefs/Definer.java

@@ -463,12 +463,12 @@ public abstract class Definer extends DefBase {
         if (definerSet) {
             tooManyDefinitions();
         }
-        if (!antlib.startsWith("antlib:")) {
+        if (!antlib.startsWith(MagicNames.ANTLIB_PREFIX)) {
             throw new BuildException(
                 "Invalid antlib attribute - it must start with antlib:");
         }
         setURI(antlib);
-        this.resource = antlib.substring("antlib:".length()).replace('.', '/')
+        this.resource = antlib.substring(MagicNames.ANTLIB_PREFIX.length()).replace('.', '/')
             + "/antlib.xml";
         definerSet = true;
     }