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and not make any hyperlinks and headers mandatory for coding the page.
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You keep saying this, but you keep ignoring the fact that you've been told over and over that there
are no mandatory hyperlinks in the OPF/NCX files. What you keep
mistakenly referring to as "hyperlinks" are the xml namespace declarations. Those namespace declarations could be named anything that uniquely indentifies them. But the various developers/groups that have defined those namespaces, use familiar URLs for their unique names so that it's easier for people
who have no idea what those namespace specifications are to research those specs.
The namespace URI is not used by the parser to look up information. But they need to be there so parsers know which namespace scheme you're using.