<xsl:attribute-set name="section.level1.properties" use-attribute-sets="section.properties">
</xsl:attribute-set>

Description

The properties that apply to the containing block of a level-1 section, and therefore apply to the whole section. This includes sect1 elements and section elements at level 1.

For example, you could start each level-1 section on a new page by using:

<xsl:attribute-set name="section.level1.properties">
  <xsl:attribute name="break-before">page</xsl:attribute>
</xsl:attribute-set>

This attribute set inherits attributes from the general section.properties attribute set.