2.1.1687 Part 1 Section 22.1.2.77, oMath (Office Math)
a. The standard allows adjacent oMath elements without any separation between them.
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Word merges together adjacent oMath elements if they are not separated by a WordprocessingML br element.
b. The standard allows nesting of oMath elements inside a math object argument or inside another oMath element.
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Word fails to open a file with an oMath element inside a math object argument or inside another oMath element.
c. The standard does not state that the hyperlink and smartTag elements are valid child elements of the oMath element.
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Word allows these elements to be child elements of the oMath element.
d. The standard allows math content to exist outside of any oMath element.
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Word will not open a file which contains math content outside of any oMath element.
e. The standard allows oMath to occur outside of any p element.
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Word will not open a file where oMath occurs outside of any p element.
f. The standard states that the oMath element is allowed where block level content is required.
Word does not allow the oMath element to be a child of the body, comment, customXml (Block-Level Custom XML Element), customXml (Cell-Level Custom XML Element), customXml (Row-Level Custom XML Element), docPartBody, endnote, footnote, ftr, hdr, sdtContent (Block-Level Structured Document Tag Content), sdtContent (Cell-Level Structured Document Tag Content), sdtContent (Row-Level Structured Document Tag Content), tbl, tc, tr, or txbxContent elements.