diff -r 000000000000 -r 6474c204b198 toolkit/components/feeds/nsIFeedTextConstruct.idl
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/components/feeds/nsIFeedTextConstruct.idl	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,57 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+
+interface nsIURI;
+interface nsIDOMElement;
+interface nsIDOMDocumentFragment;
+
+/**
+ * nsIFeedTextConstructs represent feed text fields that can contain
+ * one of text, HTML, or XHTML. Some extension elements also have "type"
+ * parameters, and this interface could be used there as well.
+ */ 
+[scriptable, uuid(fc97a2a9-d649-4494-931e-db81a156c873)]
+interface nsIFeedTextConstruct : nsISupports 
+{
+  /**
+   * If the text construct contains (X)HTML, relative references in
+   * the content should be resolved against this base URI.
+   */
+  attribute nsIURI base;
+
+  /**
+   * The language of the text. For example, "en-US" for US English.
+   */
+  attribute AString lang;
+
+  /**
+   * One of "text", "html", or "xhtml". If the type is (x)html, a '<'
+   * character represents markup. To display that character, an escape
+   * such as &lt; must be used. If the type is "text", the '<'
+   * character represents the character itself, and such text should
+   * not be embedded in markup without escaping it first.
+   */
+  attribute AString type;
+
+  /**
+   * The content of the text construct.
+   */
+  attribute AString text;
+
+  /**
+   * Returns the text of the text construct, with all markup stripped 
+   * and all entities decoded. If the type attribute's value is "text",
+   * this function returns the value of the text attribute unchanged.
+   */
+  AString plainText();
+
+  /**
+   * Return an nsIDocumentFragment containing the text and markup.
+   */
+  nsIDOMDocumentFragment createDocumentFragment(in nsIDOMElement element);
+};
+