In Markua, you can create a part like this:
{class: part}
# Part One
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
# Chapter One
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
## Section One
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
# Chapter Two
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
To include this whole part in your sample book, you would add {sample: true} to the part header like this:
{class: part, sample: true}
# Part One
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
# Chapter One
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
## Section One
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
# Chapter Two
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
However, if you just want to include in the sample book the paragraph directly under the Part One header, but not anything under Chapter One, Section One, or Chapter Two, you would add cascade: false to the part header like this:
{class: part, sample: true, cascade: false}
# Part One
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
# Chapter One
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
## Section One
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
# Chapter Two
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
With these settings, the Lorem ipsum paragraph would be in the sample, but none of the Ut enim ad paragraphs would be in the sample.
For more information about book samples, see this section in the Markua Spec: Conditional Inclusion Attributes on Headings.
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