section.level4.properties attribute set section.level4.properties Properties for level-4 sections The properties that apply to the containing block of a level-4 section, and therefore apply to the whole section. This includes sect4 elements and section elements at level 4. For example, you could start each level-4 section on a new page by using: <xsl:attribute-set name="section.level4.properties"> <xsl:attribute name="break-before">page</xsl:attribute> </xsl:attribute-set> This attribute set inherits attributes from the general section.properties attribute set.