An alternating pattern with "alt1" and "alt2" starts from the first page. However, if header or footer with a func="first" is also defined, it will shift the pattern by one page. A header or footer with func="last" will interupt the pattern.
<macroSpec ident="data.PGFUNC" module="MEI" type="dt">
<desc xml:lang="en">Page header and footer function; a value that defines the function (i.e., the placement)
of the header or the footer.</desc>
<content>
<valList type="closed">
<valItem ident="all">
<desc xml:lang="en">Header or footer for all pages, including the first and the last page, unless a page
header or footer for the first or the last page is provided.</desc>
</valItem>
<valItem ident="first">
<desc xml:lang="en">Header or footer for the first page only.</desc>
</valItem>
<valItem ident="last">
<desc xml:lang="en">Header or footer for the last page only.</desc>
</valItem>
<valItem ident="alt1">
<desc xml:lang="en">The first of an alternating pattern of headers or footers.</desc>
</valItem>
<valItem ident="alt2">
<desc xml:lang="en">The second of an alternating pattern of headers or footers.</desc>
</valItem>
</valList>
</content>
<remarks xml:lang="en">
<p>An alternating pattern with "alt1" and "alt2" starts from the first page. However,
if header or footer with a func="first" is also defined, it will shift the pattern
by one page. A header or footer with func="last" will interupt the pattern.</p>
</remarks>
</macroSpec>