L.1.11.5 Empty Header or Footer

Not specifying a header and footer reference in a section, other than the first section, causes the document to inherit the previous section’s header and footer references. In order to declare an empty header or footer, a header or footer reference must be made to a null header or footer relationship, as follows:

<Relationship Id="rId2" Type="http:// …/header" Target="null" />

The null attribute value specifies that the header or footer must not be inherited from the previous section, and a blank header or footer must explicitly be used.