There is no value for text flowing Right to Left, Top to Bottom, which leaves scripts like Arabic and Hebrew without proper description.

Add proper description also for text flowing from Right to Left (Arabic and Hebrew).

"ST_TextDirection (Text Flow Direction)"
, page 1829. Section 2.18.100

ed

Proposed Disposition of DIS 29500 Comment IL-0021 (Modified: 2008-01-13) Text flowing Right to Left, Top to Bottom is provided by the combination of lrTb (left-to-right, top-to- bottom) and the application of the bidi element to the paragraphs contained within the object. However, that fact is not readily apparent from the descriptions in Part 4, §2.18.100. The following changes will be made: These values, which inappropriately imply the directionality of the text as left-to-right, will be deprecated and replaced with direction-neutral values. This is fully described in the response to IL-0026. The deprecated values will be updated to correctly identify that they are also neutral. Within the deprecated values, the following changes will be made to the enumeration value descriptions in Part 4, §2.18.100, pages 1,830­1,831 to be agnostic to the directionality within paragraphs: Enumeration Value Description btLr ( Bottom to Top, Lines Flow From Left to Right) Specifies that text in the parent object shall be oriented flow from bottom to top vertically, then flowing from left to right horizontally on the page. This means that vertical lines are filled before the text expands horizontally. lrTb ( Left to Right, Lines Flow From Top to Bottom) Specifies that text in the parent object shall be oriented flow from left to right horizontally, then flowing from top to bottom vertically on the page. The text direction can be set to right-to-left using the bidi element (§2.3.1.6) within individual paragraphs. This means that horizontal lines are filled before the text expands vertically. lrTbV ( Left to Right, Lines Flow From Top to Bottom Rotated) Specifies that text in the parent object shall be oriented flow from left to right horizontally, then flowing from top to bottom vertically on the page. This means that horizontal lines are filled before Enumeration Value Description the text expands vertically. This flow is also rotated such that any characters from an East Asian text script shall be rotated 270 degrees clockwise when displayed on a page. tbLrV ( Top to Bottom, Lines Flow From Left to Right Rotated) Specifies that text in the parent object shall be oriented flow from top to bottom vertically, then flowing from left to right horizontally on the page. This means that vertical lines are filled before the text expands horizontally. This flow is also rotated such that all text which is not in an East Asian script is rotated 90 degrees clockwise when displayed on a page. tbRl ( Top to Bottom, Lines Flow From Right to Left) Specifies that text in the parent object shall be oriented flow from right to left horizontally vertically , then flowing from right to left top to bottom vertically horizontally on the page. This means that horizontal vertical lines are filled before the text expands vertically horizontally . tbRlV ( Top to Bottom, Lines Flow From Right to Left Rotated) Specifies that text in the parent object shall be oriented flow from top to bottom vertically, then flowing from right to left horizontally on the page. This means that vertical lines are filled before the text expands horizontally. This flow is also rotated such that all text which is in an East Asian script is rotated 90 degrees counter-clockwise when displayed on a page.