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        The text interface should be implemented by objects which place
        textual information onscreen as character strings or glyphs.
        The text interface allows access to textual content, including
        display attributes and semantic hints associated with runs of
        text, and access to bounding box information for glyphs and substrings.
        It also allows portions of textual content to be selected, if
        the object's StateSet includes STATE_SELECTABLE_TEXT.
        In some cases a Text object may have, as its content, an empty
        string. In particular this can occur in the case of Hypertext
        objects which do not display explicitly textual information onscreen,
        as Hypertext is derived from the Text interface. 
        Typographic and semantic attributes of onscreen textual content,
        for instance typeface, weight, language, and such qualities as
        'emphasis' or 'blockquote', are represented as text attributes.
        Contiguous sequences of characters over which these attributes
        are unchanged are referred to as "attribute runs", and are available
        via Text::getAttributeRun. Where possible, implementing clients
        will report textual attributes which are the same over the entire
        text object, for instance those inherited from a default or document-scope
        style, via getDefaultAttributes instead of reporting them explicitly
        for each character. Therefore, for any span of text, the attributes
        in effect are the union of the set returned by Text::getDefaultAttributes,
        and the set returned at a particular character offset via Text::getAttributeRun.
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                The result of calling addSelection on objects which already have
                one selection present, and which do not include STATE_MULTISELECTABLE,
                is undefined, other than the return value. 
                @return True of the selection was successfully added, False otherwise.
                Selection may fail if the object does not support selection of
                text (see STATE_SELECTABLE_TEXT), if the object does not support
                multiple selections and a selection is already defined, or for
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                Query a particular text object for the text attributes defined
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                run" over which these attributes are currently invariant. Text
                attributes are those presentational, typographic, or semantic
                attributes or qualitites which apply to a range of text specifyable
                by starting and ending offsets. Attributes relevant to localization
                should be provided in accordance with the w3c "Internationalization
                and Localization Markup Requirements", http://www.w3.org/TR/2005/WD-itsreq-20051122/
                Other text attributes should choose their names and value semantics
                in accordance with relevant standards such as CSS level 2 (http://www.w3.org/TR/1998/REC-CSS2-19980512),
                XHTML 1.0 (http://www.w3.org/TR/2002/REC-xhtml1-20020801), and
                WICD (http://www.w3.org/TR/2005/WD-WICD-20051121/). Those attributes
                from the aforementioned specifications and recommendations which
                do not concern typographic, presentational, or semantic aspects
                of text should be exposed via the more general Accessible::getAttributes()
                API (if at all).
                For example, CSS attributes which should be exposed on text (either
                as default attributes, or as explicitly-set attributes when non-default
                values are specified in the content view) include the Font attributes
                (i.e. "css2:font-weight", "css2:font-style"), the "css2:color"
                and "css2:background-color" attributes, and "css2:text-decoration"
                attribute.
                If includeDefaults is TRUE, then this AttributeSet should include
                the default attributes as well as those which are explicitly
                assigned to the attribute run in question. startOffset and endOffset
                will be back-filled to indicate the start and end of the attribute
                run which contains 'offset' - an attribute run is a contiguous
                section of text whose attributes are homogeneous. 
                @param : offset
                the offset of the character whose attributes will be reported.
                @param : startOffset
                backfilled with the starting offset of the character range over
                which all text attributes match those of offset, i.e. the start
                of the homogeneous attribute run including offset. 
                @param : endOffset
                backfilled with the offset of the first character past the character
                range over which all text attributes match those of offset, i.e.
                the character immediately after the homogeneous attribute run
                including offset. 
                @param : includeDefaults
                if False, the call should only return those attributes which
                are explicitly set on the current attribute run, omitting any
                attributes which are inherited from the default values. See also
                Text::getDefaultAttributes.
                @return the AttributeSet defined at offset, optionally including
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                @param : attributeName
                the name of the attribute for which the value is to be returned,
                if defined. 
                @param : startOffset
                back-filled with the offset of the first character in the attribute
                run containing the character at offset. 
                @param : endOffset
                back-filled with the offset of the first character past the end
                of the attribute run containing the character at offset. 
                @param : defined
                back-filled with True if the attributeName has a defined value
                at offset, False otherwise. 
                @return the value of attribute (name-value pair) corresponding
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                @param : x
                the minimum x ( i.e. leftmost) coordinate of the bounding box.
                @param : y
                the minimum y coordinate of the bounding box. 
                @param : width
                the horizontal size of the bounding box. The rightmost bound
                of the bounding box is (x + width); 
                @param : height
                the vertical size of the bounding box. The maximum y value of
                the bounding box is (y + height); 
                @param : coordType
                If 0, the above coordinates are interpreted as pixels relative
                to corner of the screen; if 1, the coordinates are interpreted
                as pixels relative to the corner of the containing toplevel window.
                @param : xClipType
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                to multiple character offsets, for instance if the glyph is a
                ligature, the bounding box reported will include the entire glyph
                and therefore may apply to more than one character offset. 
                @param : offset
                the character offset of the character or glyph being queried.
                @param : coordType
                If 0, the results will be reported in screen coordinates, i.e.
                in pixels relative to the upper-left corner of the screen, with
                the x axis pointing right and the y axis pointing down. If 1,
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                a text 'selection' is defined by a start/end offset pair. In
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                @param : x
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                @param : width
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                @param : startOffset
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                @param : offset
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                @param : startOffset
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                @param : offset
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                @param : startOffset
                back-filled with the starting offset of the resulting substring,
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                @param : offset
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                @param : startOffset
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                @param : startOffset
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