Improving the interoperability between OOXML and ODF is desired, but ODF has the following feature which is lacking in OOXML: any number of rows can be selected for repeating Heading
In order to improve the interoperability between OOXML and ODF, support for this feature should be included in WordProccessingML.
Part 4, Section 2
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Proposed Disposition of DIS 29500 Comment IR-0009 (Modified: 2007-12-04) The functionality described (specifying a multi-row header that repeats across pages) is provided for by the tblHeader element in Part 4, §2.4.46. However, the current text will be improved to make that clearer by modifying the description in Part 4, §2.4.46, page 421, lines 2526, as follows: This element specifies that the current table row shall be repeated at the top of each new page on which part of this table is displayed. This gives this table row the behavior of a ‘header’ row on each of these pages. This element can be applied to any number of rows at the top of the table structure in order to generate multi-row table headers. Similar Comments: CL-0072 , CL-0088 , CO-0089 , GB-0139 , GB-0199 , GR-0096 , KE-0072 , NZ-0030
Note that this may have originally come from this MS sponsored sourceforge project:
http://odf-converter.sourceforge.net/features.html search down page for “Repeat Heading in a Table”