Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Xml/System/Xml/IXmlNamespaceResolver.cs

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+//------------------------------------------------------------------------------
+// <copyright file="IXmlNamespaceResolver.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+// <owner current="true" primary="true">helenak</owner>
+//------------------------------------------------------------------------------
+
+using System;
+using System.Collections;
+using System.Collections.Generic;
+
+namespace System.Xml {
+
+    // Provides read-only access to a set of (prefix, namespace) mappings.  Each distinct prefix is mapped to exactly
+    // one namespace, but multiple prefixes may be mapped to the same namespace (e.g. xmlns:foo="ns" xmlns:bar="ns").
+    public interface IXmlNamespaceResolver {
+
+// This pragma disables a warning that the return type is not CLS-compliant, but generics are part of CLS in Whidbey. 
+#pragma warning disable 3002
+        // Returns a collection of defined prefix-namespace mappings.
+        IDictionary<string,string> GetNamespacesInScope( XmlNamespaceScope scope );
+#pragma warning restore 3002
+
+        // Return the namespace to which the specified prefix is mapped.  Returns null if the prefix isn't mapped to
+        // a namespace.  
+        // The "xml" prefix is always mapped to the "http://www.w3.org/XML/1998/namespace" namespace.
+        // The "xmlns" prefix is always mapped to the "http://www.w3.org/2000/xmlns/" namespace.
+        // If the default namespace has not been defined, then the "" prefix is mapped to "" (the empty namespace).
+        string LookupNamespace(string prefix);
+
+        // Return a prefix which is mapped to the specified namespace.  Multiple prefixes can be mapped to the
+        // same namespace, and it is undefined which prefix will be returned.  Returns null if no prefixes are
+        // mapped to the namespace.  
+        // The "xml" prefix is always mapped to the "http://www.w3.org/XML/1998/namespace" namespace.
+        // The "xmlns" prefix is always mapped to the "http://www.w3.org/2000/xmlns/" namespace.
+        // If the default namespace has not been defined, then the "" prefix is mapped to "" (the empty namespace).
+        string LookupPrefix(string namespaceName);
+    }
+}