Many attributes throughout the Ecma 376 spec take values in "English Metric Units" (EMU). For example, attributes of type ST_PositiveCoordinate are measured in EMUs. This is not a known unit in existing literature. It is only defined inside a paragraph in section 5.9.2.1, so that "91440 EMUs/U.S. inch, 36000 EMUs/cm". Similarly, 2.18.105 specifies "twips"-twentieths of a point (1/1440th of an inch).
Suggest to specify "EMU" in the section.
Part 4
5.1.12.42
5.9.2.1
2.18.105
Ed
Proposed Disposition of DIS 29500 Comment DK-0140 (Modified: 2008-01-08) Agreed; we will add a normative definition of the EMU to the specification, and correct the error which made its definition seem inconsistent. This update requires changes throughout parts 3 and 4 we will introduce a new section which will define this unit of measurement, as used throughout the specification. Additional subclause to be added to both Part 3, under §2.18, page 92, line 26 and Part 4, under §5.1.2.1, page 3220, line 30: 2.18.5 EMU Unit of Measurement Throughout this specification, the EMU is used as a unit of measurement for length. An EMU is defined as follows: 1 emu = 1 914400 US inch = 1 360000 cm [Rationale: The EMU was created in order to be able to evenly divide in both English and Metric units, in order to avoid rounding errors during the calculation. The usage of EMUs also facilitates a more seamless system switch and interoperability between different locales utilizing different units of measurement. EMUs define an integer based, high precision coordinate system. end rationale] To Part 3, §5.7.2, page 310, line 21: Coordinates are measured in EMUs (914400 EMUs per inch) , and can be positive or negative. To Part 3, §5.9.2.1, page 339, lines 10-11: downwards. The units of measurement within the document coordinate system are EMUs (91440 EMUs/U.S. inch, 36000 EMUs/cm) . In addition to specifying a position for the shape, you must also specify the width and To Part 4, §5.1.12.16, lines 13-14: This simple type represents a one dimensional position or length in EMUs. EMUs (English Metric Units) are a high precision coordinate space (914400 dpi / 360000 dpc). Similar Comments: CL-0030 , CO-0043 , CO-0212 , PL-0004
