Final answer:
Within a section's <schemas> tags, the properties 'settings' and 'presets' would not be defined.
Step-by-step explanation:
Within a section's <schemas> tags, the properties that would not be defined are 'C. settings' and 'D. presets'. The 'settings' and 'presets' are typically used to configure and customize the section or element being defined, rather than being defined within the section's schemas tags themselves.
For example:
- <section>
<name>Section1</name>
<class>important</class>
<schemas>
<title>Introduction</title>
<name>Section1</name>
<class>important</class>
</schemas>
<settings>
<property>value</property>
</settings>
<presets>
<preset>value</preset>
</presets>
</section>