2.1.160 Part 1 Section 8.3.3, text:table-of-content-entry-template
a. The standard defines the element <text:table-of-content-entry-template>
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This element is not supported in Word 2013, Word 2016, or Word 2019.
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On load, Word ignores the table of contents style and uses a default table of contents style.
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On save, Word writes out the style of the table of contents.