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+/*************************************************************************
+ *
+ *  File Name (AccessibleRelation.idl)
+ *
+ *  IAccessible2 IDL Specification
+ *
+ *  Copyright (c) 2007, 2010 Linux Foundation
+ *  Copyright (c) 2006 IBM Corporation
+ *  Copyright (c) 2000, 2006 Sun Microsystems, Inc.
+ *  All rights reserved.
+ *
+ *
+ *  Redistribution and use in source and binary forms, with or without
+ *  modification, are permitted provided that the following conditions
+ *  are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above
+ *      copyright notice, this list of conditions and the following
+ *      disclaimer in the documentation and/or other materials
+ *      provided with the distribution.
+ *
+ *   3. Neither the name of the Linux Foundation nor the names of its
+ *      contributors may be used to endorse or promote products
+ *      derived from this software without specific prior written
+ *      permission.
+ *
+ *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
+ *  CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
+ *  INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ *  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+ *  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ *  NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ *  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ *  HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ *  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ *  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+ *  EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ *  This BSD License conforms to the Open Source Initiative "Simplified
+ *  BSD License" as published at:
+ *  http://www.opensource.org/licenses/bsd-license.php
+ *
+ *  IAccessible2 is a trademark of the Linux Foundation. The IAccessible2
+ *  mark may be used in accordance with the Linux Foundation Trademark
+ *  Policy to indicate compliance with the IAccessible2 specification.
+ *
+ ************************************************************************/
+
+import "objidl.idl";
+import "oaidl.idl";
+import "oleacc.idl";
+
+/** @defgroup grpRelations Relations
+  Use the following constants to compare against the BSTRs returned by
+  IAccessibleRelation::relationType.
+*/
+///@{
+
+/** Some attribute of this object is affected by a target object. */
+const WCHAR *const IA2_RELATION_CONTROLLED_BY = L"controlledBy";
+
+/** This object is interactive and controls some attribute of a target object. */
+const WCHAR *const IA2_RELATION_CONTROLLER_FOR = L"controllerFor";
+
+/** This object is described by the target object. */
+const WCHAR *const IA2_RELATION_DESCRIBED_BY = L"describedBy";
+
+/** This object is describes the target object. */
+const WCHAR *const IA2_RELATION_DESCRIPTION_FOR = L"descriptionFor";
+
+/** This object is embedded by a target object. */
+const WCHAR *const IA2_RELATION_EMBEDDED_BY = L"embeddedBy";
+
+/** This object embeds a target object. This relation can be used on the
+ OBJID_CLIENT accessible for a top level window to show where the content
+ areas are.
+*/
+const WCHAR *const IA2_RELATION_EMBEDS = L"embeds";
+
+/** Content flows to this object from a target object.
+ This relation and IA2_RELATION_FLOWS_TO are useful to tie text and non-text
+ objects together in order to allow assistive technology to follow the
+ intended reading order.
+*/
+const WCHAR *const IA2_RELATION_FLOWS_FROM = L"flowsFrom";
+
+/** Content flows from this object to a target object. */
+const WCHAR *const IA2_RELATION_FLOWS_TO = L"flowsTo";
+
+/** This object is label for a target object. */
+const WCHAR *const IA2_RELATION_LABEL_FOR = L"labelFor";
+
+/** This object is labelled by a target object. Note that the double L spelling
+ which follows is preferred.  Please use it instead.  This single L version may
+ be removed in a later version.
+*/
+const WCHAR *const IA2_RELATION_LABELED_BY = L"labelledBy";
+
+/** This object is labelled by a target object. */
+const WCHAR *const IA2_RELATION_LABELLED_BY = L"labelledBy";
+
+/** This object is a member of a group of one or more objects. When
+ there is more than one object in the group each member may have one and the
+ same target, e.g. a grouping object.  It is also possible that each member has
+ multiple additional targets, e.g. one for every other member in the group.
+*/
+const WCHAR *const IA2_RELATION_MEMBER_OF = L"memberOf";
+
+/** This object is a child of a target object. */
+const WCHAR *const IA2_RELATION_NODE_CHILD_OF = L"nodeChildOf";
+
+/** This object is a parent window of the target object. */
+const WCHAR *const IA2_RELATION_PARENT_WINDOW_OF = L"parentWindowOf";
+
+/** This object is a transient component related to the target object.
+ When this object is activated the target object doesn't lose focus.
+*/
+const WCHAR *const IA2_RELATION_POPUP_FOR = L"popupFor";
+
+/** This object is a sub window of a target object. */
+const WCHAR *const IA2_RELATION_SUBWINDOW_OF = L"subwindowOf";
+
+///@}
+
+/// This interface gives access to an object's set of relations.
+[object, uuid(7CDF86EE-C3DA-496a-BDA4-281B336E1FDC)]
+interface IAccessibleRelation : IUnknown
+{
+  /** @brief Returns the type of the relation.
+   @param [out] relationType
+    The strings returned are defined @ref grpRelations "in this section of the documentation".
+   @retval S_OK
+  */
+  [propget] HRESULT relationType
+    (
+     [out, retval] BSTR *relationType
+    );
+
+  /** @brief Returns a localized version of the relation type.
+   @param [out] localizedRelationType
+   @retval S_OK
+  */
+  [propget] HRESULT localizedRelationType
+    (
+     [out, retval] BSTR *localizedRelationType
+    );
+
+  /** @brief Returns the number of targets for this relation.
+   @param [out] nTargets
+   @retval S_OK
+  */
+  [propget] HRESULT nTargets
+    (
+     [out, retval] long *nTargets
+    );
+
+  /** @brief Returns one accessible relation target.
+   @param [in] targetIndex
+    0 based index
+   @param [out] target
+   @retval S_OK
+   @retval E_INVALIDARG if bad [in] passed
+   @note Use QueryInterface to get IAccessible2.
+  */
+  [propget] HRESULT target
+    (
+     [in] long targetIndex,
+     [out, retval] IUnknown **target
+    );
+
+  /** @brief Returns multiple accessible relation targets
+   @param [in] maxTargets
+    maximum size of the array allocated by the client
+   @param [out] targets
+    The array of target objects.  Note that this array is to be allocated by the
+    client and freed when no longer needed.  Refer to @ref _arrayConsideration
+    "Special Consideration when using Arrays" for more details.  You will need to use
+    QueryInterface on the IUnknown to get the IAccessible2.
+   @param [out] nTargets
+    actual number of targets in the returned array (not more than maxTargets)
+   @retval S_OK
+   @retval E_INVALIDARG if bad [in] passed, e.g. a negative value
+  */
+  [propget] HRESULT targets
+    (
+     [in] long maxTargets,
+     [out, size_is(maxTargets), length_is(*nTargets)]
+       IUnknown **targets,
+     [out, retval] long *nTargets
+    );
+
+}