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gecko-dev/other-licenses/ia2/AccessibleText.idl
Alexander Surkov 7d4a6e1f71 Bug 614570 - Rev IAccessible2 1.3, r=tbsaunde
2013-05-19 10:21:42 +09:00

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/*************************************************************************
*
* File Name (AccessibleText.idl)
*
* IAccessible2 IDL Specification
*
* Copyright (c) 2007, 2013 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";
import "IA2CommonTypes.idl";
/** A structure containing a substring and the start and end offsets in the enclosing string.
IAccessibleText::newText and IAccessibleText::oldText return this struct.
*/
typedef struct IA2TextSegment {
BSTR text; ///< A copy of a segment of text taken from an enclosing paragraph.
long start; ///< Index of the first character of the segment in the enclosing text.
long end; ///< Index of the character following the last character of the segment in the enclosing text.
} IA2TextSegment;
/** This enum defines values which specify a text boundary type.
IA2_TEXT_BOUNDARY_SENTENCE is optional. When a method doesn't implement this
method it must return S_FALSE. Typically this feature would not be implemented
by an application. However, if the application developer was not satisfied with
how screen readers have handled the reading of sentences this boundary type
could be implemented and screen readers could use the application's version of a
sentence rather than the screen reader's.
The rest of the boundary types must be supported.
This enum is used in IAccessibleText::textBeforeOffset, IAccessibleText::textAtOffset,
and IAccessibleText::textAfterOffset.
*/
enum IA2TextBoundaryType {
IA2_TEXT_BOUNDARY_CHAR, /**< Typically, a single character is returned. In some cases more than
one character is returned, for example, when a document contains field
data such as a field containing a date, time, or footnote reference.
In this case the caret can move over several characters in one movement
of the caret. Note that after the caret moves, the caret offset changes
by the number of characters in the field, e.g. by 8 characters in the
following date: 03/26/07. */
IA2_TEXT_BOUNDARY_WORD, /**< The range provided matches the range observed when the application
processes the Ctrl + left arrow and Ctrl + right arrow key sequences.
Typically this is from the start of one word to the start of the next, but
various applications are inconsistent in the handling of the end of a line. */
IA2_TEXT_BOUNDARY_SENTENCE, ///< Range is from start of one sentence to the start of another sentence.
IA2_TEXT_BOUNDARY_PARAGRAPH, ///< Range is from start of one paragraph to the start of another paragraph.
IA2_TEXT_BOUNDARY_LINE, /**< Range is from start of one line to the start of another line. This
often means that an end-of-line character will appear at the end of the
range. However in the case of some applications an end-of-line character
indicates the end of a paragraph and the lines composing the paragraph,
other than the last line, do not contain an end of line character. */
IA2_TEXT_BOUNDARY_ALL ///< Using this value will cause all text to be returned.
};
/** @brief This interface gives read-only access to text.
The %IAccessibleText interface should be implemented by all components
that present textual information on the display like buttons,
text entry fields, or text portions of the document window. The interface
provides access to the text's content, attributes, and spatial location.
However, text can not be modified with this interface. That is the task
of the IAccessibleEditableText interface.
The text length, i.e. the number of characters in the text, is
returned by IAccessibleText::nCharacters. All methods that operate
on particular characters (e.g. IAccessibleText::textAtOffset) use character
indices from 0 to length-1. All methods that operate on character positions
(e.g. IAccessibleText::text) use indices from 0 to length.
Please note that accessible text does not necessarily support selection.
In this case it should behave as if there where no selection. An empty
selection is used for example to express the current cursor position.
Refer to @ref _specialOffsets
"Special Offsets for use in the IAccessibleText and IAccessibleEditableText Methods"
for information about special offsets that can be used in %IAccessibleText methods.
E_FAIL is returned in the following cases
@li endOffset < startOffset
@li endoffset > length
*/
[object, uuid(24FD2FFB-3AAD-4a08-8335-A3AD89C0FB4B)]
interface IAccessibleText : IUnknown
{
/** @brief Adds a text selection
@param [in] startOffset
Starting offset ( 0 based).
@param [in] endOffset
Offset of first character after new selection (0 based).
@retval S_OK
@retval E_INVALIDARG if bad [in] passed
@note Refer to @ref _specialOffsets
"Special Offsets for use in the IAccessibleText and IAccessibleEditableText Methods"
for information about special offsets that can be used in %IAccessibleText methods.
*/
HRESULT addSelection
(
[in] long startOffset,
[in] long endOffset
);
/** @brief Returns text attributes.
@param [in] offset
Text offset (0 based). Refer to @ref _specialOffsets
"Special Offsets for use in the IAccessibleText and IAccessibleEditableText Methods"
for information about special offsets that can be used in %IAccessibleText methods.
@param [out] startOffset
The starting offset of the character range over which all text attributes match
those of offset. (0 based)
@param [out] endOffset
The offset of the first character past the character range over which all text
attributes match those of offset. (0 based)
@param [out] textAttributes
A string of attributes describing the text. The attributes are described in the
<a href="http://www.linuxfoundation.org/en/Accessibility/IAccessible2/TextAttributes">
text attributes specification</a> on the %IAccessible2 web site.
@retval S_OK
@retval S_FALSE if there is nothing to return, [out] values are 0s and NULL respectively
@retval E_INVALIDARG if bad [in] passed
*/
[propget] HRESULT attributes
(
[in] long offset,
[out] long *startOffset,
[out] long *endOffset,
[out, retval] BSTR *textAttributes
);
/** @brief Returns the position of the caret.
Returns the 0-based offset of the caret within the text. If the text is
implemented as a tree of text objects with embed characters in higher levels
representing substrings of child text objects and the caret is in one of the
child text objects, then the offset in the higher level text object would be
at the embed character representing child text object that contains the caret.
For example, if the string "one two three" is implemented as a two text objects,
with a top level text object containing an embed character "one ? three" and a
child text object containing "two" and if the caret is in the descendant object
just before the 'o' in "two", then:
<ul>
<li>the caretOffset for the "one ? three" object would be 4, matching the embed character</li>
<li>the caretOffset for "two" would be 2, matching the "o"</li>
</ul>
The caret position/offset is that of the character logically following it, e.g.
to the right of it in a left to right language, or to the left of it in a right
to left language.
@param [out] offset
The returned offset is relative to the text represented by this object.
@retval S_OK
@retval S_FALSE if the caret is not currently active on this object, i.e. the
caret is located on some other object. The returned offset value will be -1.
@note S_FALSE (and an offset of -1) will not be returned if the caret is somewhere
in the text object or one of its descendants.
*/
[propget] HRESULT caretOffset
(
[out, retval] long *offset
);
/** @brief Returns the bounding box of the specified position.
The virtual character after the last character of the represented
text, i.e. the one at position length is a special case. It represents the
current input position and will therefore typically be queried by AT more
often than other positions. Because it does not represent an existing character
its bounding box is defined in relation to preceding characters. It should be
roughly equivalent to the bounding box of some character when inserted at the
end of the text. Its height typically being the maximal height of all the
characters in the text or the height of the preceding character, its width being
at least one pixel so that the bounding box is not degenerate.
Note that the index 'length' is not always valid. Whether it is or not is
implementation dependent. It typically is when text is editable or otherwise
when on the screen the caret can be placed behind the text. You can be sure
that the index is valid after you have received a ::IA2_EVENT_TEXT_CARET_MOVED
event for this index.
@param [in] offset
Index of the character for which to return its bounding box. The valid range
is 0..length. Refer to @ref _specialOffsets
"Special Offsets for use in the IAccessibleText and IAccessibleEditableText Methods"
for information about special offsets that can be used in %IAccessibleText methods.
@param [in] coordType
Specifies if the coordinates are relative to the screen or to the parent window.
@param [out] x
X coordinate of the top left corner of the bounding box of the referenced character.
@param [out] y
Y coordinate of the top left corner of the bounding box of the referenced character.
@param [out] width
Width of the bounding box of the referenced character.
@param [out] height
Height of the bounding box of the referenced character.
@retval S_OK
@retval E_INVALIDARG if bad [in] passed
*/
[propget] HRESULT characterExtents
(
[in] long offset,
[in] enum IA2CoordinateType coordType,
[out] long *x,
[out] long *y,
[out] long *width,
[out, retval] long *height
);
/** @brief Returns the number of active non-contiguous selections
@param [out] nSelections
@retval S_OK
*/
[propget] HRESULT nSelections
(
[out, retval] long *nSelections
);
/** @brief Returns the text position for the specified screen position.
Given a point return the zero-based index of the character under that
point. The same functionality could be achieved by using the bounding
boxes for each character as returned by IAccessibleText::characterExtents.
The method IAccessibleText::offsetAtPoint, however, can be implemented
more efficiently.
@param [in] x
The position's x value for which to look up the index of the character that
is rendered on to the display at that point.
@param [in] y
The position's y value for which to look up the index of the character that
is rendered on to the display at that point.
@param [in] coordType
Screen coordinates or window coordinates.
@param [out] offset
Index of the character under the given point or -1 if the point
is invalid or there is no character under the point.
@retval S_OK
@retval S_FALSE if nothing to return, [out] value is -1
@retval E_INVALIDARG if bad [in] passed
*/
[propget] HRESULT offsetAtPoint
(
[in] long x,
[in] long y,
[in] enum IA2CoordinateType coordType,
[out, retval] long *offset
);
/** @brief Returns the character offsets of Nth active text selection
Returns the 0-based starting and ending offsets of the Nth selection. If the
text is implemented as a tree of text objects with embed characters in higher
levels representing substrings of child text objects, consider the following.
If the starting selection offset is in one of the child text objects, then the
starting offset in the higher level text object would be at the embed character
representing the child text object that contains the starting selection offset.
If the ending selection offset is in one of the child text objects, then the
ending offset in the higher level text object would be just after the embed
character representing the child text object that contains the ending selection
offset.
For example, if the string "one two three" is implemented as a two text objects,
with a top level text object containing an embed character "one ? three" and a
child text object containing "two" and if the selection is the string "two" then:
<ul>
<li>the startOffset for the "one ? three" object would be 4, matching the embed character and the endOffset would be 5.</li>
<li>the startOffset for the "two" object would be 0, and the endOffset would be 3</li>
</ul>
Selection offsets are that of the character logically following it, e.g.
to the right of it in a left to right language or to the left of it in a right to left language.
@param [in] selectionIndex
Index of selection (0 based).
@param [out] startOffset
0 based offset of first selected character
@param [out] endOffset
0 based offset of one past the last selected character.
@retval S_OK
@retval E_INVALIDARG if bad [in] passed
*/
[propget] HRESULT selection
(
[in] long selectionIndex,
[out] long *startOffset,
[out, retval] long *endOffset
);
/** @brief Returns the substring between the two given indices.
The substring starts with the character at startOffset (inclusive) and up to
the character at endOffset (exclusive), if startOffset is less or equal
endOffset. If endOffset is lower than startOffset, the result is the same
as a call with the two arguments being exchanged.
The whole text can be requested by passing the indices zero and
IAccessibleText::nCharacters. If both indices have the same value, an empty
string is returned.
@param [in] startOffset
Index of the first character to include in the returned string. The valid range
is 0..length.
@param [in] endOffset
Index of the last character to exclude in the returned string. The valid range
is 0..length.
@param [out] text
Returns the substring starting with the character at startOffset (inclusive)
and up to the character at endOffset (exclusive), if startOffset is less than
or equal to endOffset.
@retval S_OK
@retval E_INVALIDARG if bad [in] passed
@note
@li The returned string may be longer than endOffset-startOffset bytes if text
contains multi-byte characters.
@li Refer to @ref _specialOffsets
"Special Offsets for use in the IAccessibleText and IAccessibleEditableText Methods"
for information about special offsets that can be used in %IAccessibleText methods.
*/
[propget] HRESULT text
(
[in] long startOffset,
[in] long endOffset,
[out, retval] BSTR *text
);
/** @brief Returns a text portion before the given position.
Returns the substring of the specified text type that is located before the
given character and does not include it. The result of this method should be
same as a result for IAccessibleText::textAtOffset with a suitably decreased
index value.
For example, if text type is ::IA2_TEXT_BOUNDARY_WORD, then the complete
word that is closest to and located before offset is returned.
If the index is valid, but no text is found, S_FALSE is returned along with out
values of 0, 0, and a NULL pointer. This would happen for boundary types other
than character when the text consists entirely of whitespace.
@param [in] offset
Index of the character for which to return the text part before it. The index
character will not be part of the returned string. The valid range is 0..length.
Refer to @ref _specialOffsets
"Special Offsets for use in the IAccessibleText and IAccessibleEditableText Methods"
for information about special offsets that can be used in %IAccessibleText methods.
@param [in] boundaryType
The type of the text portion to return. See ::IA2TextBoundaryType for the
complete list.
@param [out] startOffset
0 based offset of first character.
@param [out] endOffset
0 based offset of one past the last character.
@param [out] text
Returns the requested text portion. This portion may be empty or invalid when
no appropriate text portion is found or text type is invalid.
@retval S_OK
@retval S_FALSE if the requested boundary type is not implemented, such as
::IA2_TEXT_BOUNDARY_SENTENCE, or if there is nothing to return;
[out] values are 0s and NULL respectively
@retval E_INVALIDARG if bad [in] passed
*/
[propget] HRESULT textBeforeOffset
(
[in] long offset,
[in] enum IA2TextBoundaryType boundaryType,
[out] long *startOffset,
[out] long *endOffset,
[out, retval] BSTR *text
);
/** @brief Returns a text portion after the given position.
Returns the substring of the specified text type that is located after the
given character and does not include it. The result of this method should be
same as a result for IAccessibleText::textAtOffset with a suitably increased
index value.
For example, if text type is ::IA2_TEXT_BOUNDARY_WORD, then the complete
word that is closest to and located after offset is returned.
If the index is valid, but no text is found, S_FALSE is returned along with out
values of 0, 0, and a NULL pointer. This would happen for boundary types other
than character when the text consists entirely of whitespace.
@param [in] offset
Index of the character for which to return the text part after it. The index
character will not be part of the returned string. The valid range is 0..length.
Refer to @ref _specialOffsets
"Special Offsets for use in the IAccessibleText and IAccessibleEditableText Methods"
for information about special offsets that can be used in %IAccessibleText methods.
@param [in] boundaryType
The type of the text portion to return. See ::IA2TextBoundaryType for the complete
list.
@param [out] startOffset
0 based offset of first character.
@param [out] endOffset
0 based offset of one past the last character.
@param [out] text
Returns the requested text portion. This portion may be empty or invalid when
no appropriate text portion is found or text type is invalid.
@retval S_OK
@retval S_FALSE if the requested boundary type is not implemented, such as
::IA2_TEXT_BOUNDARY_SENTENCE, or if there is nothing to return;
[out] values are 0s and NULL respectively
@retval E_INVALIDARG if bad [in] passed
*/
[propget] HRESULT textAfterOffset
(
[in] long offset,
[in] enum IA2TextBoundaryType boundaryType,
[out] long *startOffset,
[out] long *endOffset,
[out, retval] BSTR *text
);
/** @brief Returns a text portion that spans the given position.
Returns the substring defined by the specified boundary type at the specified
offset. Refer to IA2TextBoundaryType for more details.
For the word boundary type the returned string will contain the word at the
offset if the offset is inside a word and will contain the word before the
offset if the offset is not inside a word. All offsets from the first to the
last characters of a word are considered inside the word. Boundary types of
sentence and paragraph should exhibit similar behavior.
If the index is valid, but no text is found, S_FALSE is returned along with out
values of 0, 0, and a NULL pointer. This would happen for boundary types other
than character when the text consists entirely of whitespace.
@param [in] offset
Index of the character for which to return the text part it belongs to. The valid
range is 0..length.
Refer to @ref _specialOffsets
"Special Offsets for use in the IAccessibleText and IAccessibleEditableText Methods"
for information about special offsets that can be used in %IAccessibleText methods.
@param [in] boundaryType
The type of the text portion to return. See ::IA2TextBoundaryType for the complete
list.
@param [out] startOffset
0 based offset of first character.
@param [out] endOffset
0 based offset of one past the last character.
@param [out] text
Returns the requested text portion. This portion may be empty or invalid when
no appropriate text portion is found or text type is invalid.
@retval S_OK
@retval S_FALSE if the requested boundary type is not implemented, such as
::IA2_TEXT_BOUNDARY_SENTENCE, or if there is nothing to return;
[out] values are 0s and NULL respectively
@retval E_INVALIDARG if bad [in] passed
*/
[propget] HRESULT textAtOffset
(
[in] long offset,
[in] enum IA2TextBoundaryType boundaryType,
[out] long *startOffset,
[out] long *endOffset,
[out, retval] BSTR *text
);
/** @brief Unselects a range of text.
@param [in] selectionIndex
Index of selection to remove (0 based).
@retval S_OK
@retval E_INVALIDARG if bad [in] passed
*/
HRESULT removeSelection
(
[in] long selectionIndex
);
/** @brief Sets the position of the caret.
The caret position/offset is that of the character logically following it,
e.g. to the right of it in a left to right language.
Setting the caret position may or may not alter the current selection. A
change of the selection is notified to the accessibility event listeners with
an ::IA2_EVENT_TEXT_SELECTION_CHANGED event.
When the new caret position differs from the old one (which, of course, is the
standard case) this is notified to the accessibility event listeners with an
::IA2_EVENT_TEXT_CARET_MOVED event.
@param [in] offset
The new index of the caret. This caret is actually placed to the left side of
the character with that index. An index of 0 places the caret so that the next
insertion goes before the first character. An index of IAccessibleText::nCharacters
leads to insertion after the last character. Refer to @ref _specialOffsets
"Special Offsets for use in the IAccessibleText and IAccessibleEditableText Methods"
for information about special offsets that can be used in %IAccessibleText methods.
@retval S_OK
@retval E_FAIL if the caret cannot be set
@retval E_INVALIDARG if bad [in] passed
*/
HRESULT setCaretOffset
(
[in] long offset
);
/** @brief Changes the bounds of an existing selection.
@param [in] selectionIndex
Index of selection to change (0 based)
@param [in] startOffset
New starting offset (0 based)
@param [in] endOffset
New ending offset (0 based) - the offset of the character just past the last character of the selection.
@retval S_OK
@retval E_INVALIDARG if bad [in] passed
@note Refer to @ref _specialOffsets
"Special Offsets for use in the IAccessibleText and IAccessibleEditableText Methods"
for information about special offsets that can be used in %IAccessibleText methods.
*/
HRESULT setSelection
(
[in] long selectionIndex,
[in] long startOffset,
[in] long endOffset
);
/** @brief Returns total number of characters.
Note that this may be different than the total number of bytes required to store the
text, if the text contains multi-byte characters.
@param [out] nCharacters
@retval S_OK
*/
[propget] HRESULT nCharacters
(
[out, retval] long *nCharacters
);
/** @brief Makes a specific part of string visible on screen.
@param [in] startIndex
0 based character offset.
@param [in] endIndex
0 based character offset - the offset of the character just past the last character of the string.
@param [in] scrollType
Defines where the object should be placed on the screen.
@retval S_OK
@retval E_INVALIDARG if bad [in] passed
@note Refer to @ref _specialOffsets
"Special Offsets for use in the IAccessibleText and IAccessibleEditableText Methods"
for information about special offsets that can be used in %IAccessibleText methods.
*/
HRESULT scrollSubstringTo
(
[in] long startIndex,
[in] long endIndex,
[in] enum IA2ScrollType scrollType
);
/** @brief Moves the top left of a substring to a specified location.
@param [in] startIndex
0 based character offset.
@param [in] endIndex
0 based character offset - the offset of the character just past the last character of the string.
@param [in] coordinateType
Specifies whether the coordinates are relative to the screen or the parent object.
@param [in] x
Defines the x coordinate.
@param [in] y
Defines the y coordinate.
@retval S_OK
@retval S_FALSE if the object is already at the specified location.
@retval E_INVALIDARG if bad [in] passed
@note Refer to @ref _specialOffsets
"Special Offsets for use in the IAccessibleText and IAccessibleEditableText Methods"
for information about special offsets that can be used in %IAccessibleText methods.
*/
HRESULT scrollSubstringToPoint
(
[in] long startIndex,
[in] long endIndex,
[in] enum IA2CoordinateType coordinateType,
[in] long x,
[in] long y
);
/** @brief Returns any inserted text.
Provided for use by the ::IA2_EVENT_TEXT_INSERTED and ::IA2_EVENT_TEXT_UPDATED
event handlers.
This data is only guaranteed to be valid while the thread notifying the event
continues. Once the handler has returned, the validity of the data depends on
how the server manages the life cycle of its objects. Also, note that the server
may have different life cycle management strategies for controls depending on
whether or not a control manages its children. Lists, trees, and tables can have
a large number of children and thus it's possible that the child objects for those
controls would only be created as needed. Servers should document their life cycle
strategy as this will be of interest to assistive technology or script engines
accessing data out of process or from other threads. Servers only need to save the
last inserted block of text and a scope of the entire application is adequate.
@param [out] newText
The text that was just inserted.
@retval S_OK
@retval S_FALSE If there is nothing to return, the values of IA2TextSegment
struct are set as follows: text = NULL, start = 0, end = 0.
*/
[propget] HRESULT newText
(
[out, retval] IA2TextSegment *newText
);
/** @brief Returns any removed text.
Provided for use by the IA2_EVENT_TEXT_REMOVED/UPDATED event handlers.
This data is only guaranteed to be valid while the thread notifying the event
continues. Once the handler has returned, the validity of the data depends on
how the server manages the life cycle of its objects. Also, note that the server
may have different life cycle management strategies for controls depending on
whether or not a control manages its children. Lists, trees, and tables can have
a large number of children and thus it's possible that the child objects for those
controls would only be created as needed. Servers should document their life cycle
strategy as this will be of interest to assistive technology or script engines
accessing data out of process or from other threads. Servers only need to save the
last removed block of text and a scope of the entire application is adequate.
@param [out] oldText
The text that was just removed.
@retval S_OK
@retval S_FALSE If there is nothing to return, the values of IA2TextSegment
struct are set as follows: text = NULL, start = 0, end = 0.
*/
[propget] HRESULT oldText
(
[out, retval] IA2TextSegment *oldText
);
}
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