Usage for the above feature is as follows:
<indent type="number">N</indent>
Default refpage indentation value is '0' and each indentation "shift" is 10 pixels × the indentation value.
Code:
<refpage_0003>
<indent type="number">1</indent>
<name type="string">refpage_name_here</name>
<blocks>
[block_content_here]
</blocks>
<keywords type="string"></keywords>
<listlink type="windowreference">
<class>reference_manualtextwide</class>
<recordname>..</recordname>
<description field="name"/>
</listlink>
</refpage_0003>
End result appears as follows:
https://www.fantasygrounds.com/forum...1&d=1545070050
Most of the refpages have the default '0' indentation and appear normally, then a value of '1' for the indented refpages. If the book had been laid out with further sub-levels, I could have used '2' and so on to accomplish that.