Specific ns descriptor for jsp validation

source/com/intellij/psi/filters/position/TargetNamespaceFilter.java

@@ -0,0 +1,42 @@
+package com.intellij.psi.filters.position;
+
+import com.intellij.psi.filters.TextFilter;
+import com.intellij.psi.PsiElement;
+import com.intellij.psi.xml.XmlTag;
+import com.intellij.psi.xml.XmlDocument;
+
+/**
+ * Created by IntelliJ IDEA.
+ * User: ik
+ * Date: 07.05.2003
+ * Time: 4:13:57
+ * To change this template use Options | File Templates.
+ */
+public class TargetNamespaceFilter extends TextFilter{
+  public TargetNamespaceFilter(String str){
+    super(str);
+  }
+
+  public TargetNamespaceFilter(String[] strs){
+    super(strs);
+  }
+
+  public boolean isClassAcceptable(Class hintClass){
+    return XmlTag.class.isAssignableFrom(hintClass) || XmlDocument.class.isAssignableFrom(hintClass);
+  }
+
+  public boolean isAcceptable(Object element, PsiElement context){
+    if(element instanceof XmlTag){
+      final String attributeValue = ((XmlTag)element).getAttributeValue("targetNamespace");
+      if(attributeValue != null){
+        for(int i = 0; i < myValue.length; i++){
+          if(myValue[i].equals(attributeValue)) return true;
+        }
+      }
+    }
+    else if(element instanceof XmlDocument){
+      return isAcceptable(((XmlDocument) element).getRootTag(), context);
+    }
+    return false;
+  }
+}

source/com/intellij/psi/impl/meta/MetaRegistry.java

@@ -8,6 +8,7 @@ import com.intellij.psi.PsiElement;
 import com.intellij.psi.filters.*;
 import com.intellij.psi.filters.position.NamespaceFilter;
 import com.intellij.psi.filters.position.RootTagFilter;
+import com.intellij.psi.filters.position.TargetNamespaceFilter;
 import com.intellij.psi.impl.source.jsp.tagLibrary.JspTagAttributeInfoImpl;
 import com.intellij.psi.impl.source.jsp.tagLibrary.JspTagInfoImpl;
 import com.intellij.psi.impl.source.jsp.tagLibrary.JspTagLibraryInfoImpl;
@@ -20,6 +21,7 @@ import com.intellij.psi.xml.XmlElementDecl;
 import com.intellij.psi.xml.XmlMarkupDecl;
 import com.intellij.xml.util.XmlUtil;
 import com.intellij.jsp.impl.TldDescriptor;
+import com.intellij.jsp.impl.JspNsDescriptor;
 
 import java.lang.ref.SoftReference;
 import java.util.ArrayList;
@@ -38,6 +40,13 @@ public class MetaRegistry {
   private static final List<MyBinding> ourBindings = new ArrayList<MyBinding>();
   private static final String[] TAGLIB_URIS = new String[]{XmlUtil.TAGLIB_1_1_URI, XmlUtil.TAGLIB_1_2_a_URI, XmlUtil.TAGLIB_1_2_URI, XmlUtil.TAGLIB_2_0_URI, XmlUtil.TAGLIB_1_2_b_URI,};
   private static final String[] SCHEMA_URIS = { XmlUtil.XML_SCHEMA_URI, XmlUtil.XML_SCHEMA_URI2, XmlUtil.XML_SCHEMA_URI3 };
+  private static final String[] JSP_URIS = {
+    XmlUtil.JSP_NAMESPACE,
+    "http://java.sun.com/products/jsp/dtd/jsp_1_0.dtd",
+    "http://java.sun.com/xml/ns/j2ee/jsp_2_0.xsd",
+    "http://java.sun.com/dtd/jspxml.xsd",
+    "http://java.sun.com/dtd/jspxml.dtd"
+  };
 
   static {
     {
@@ -77,6 +86,16 @@ public class MetaRegistry {
       );
     }
 
+    {
+      addMetadataBinding(
+          new AndFilter(
+              new ClassFilter(XmlDocument.class),
+              new TargetNamespaceFilter(JSP_URIS)
+          ),
+          JspNsDescriptor.class
+      );
+    }
+
     {
       addMetadataBinding(
           new AndFilter(