<document source="test data">
<section ids="if-test" names="if test">
<title>
If Test
<paragraph>
Check out if directive in substitution definitions.
<system_message level="1" line="6" source="test data" type="INFO">
<paragraph>
No directive entry for "if" in module "Text::Restructured::Directive".
Trying "if" as canonical directive name.
<substitution_definition names="empty">
<substitution_definition names="nonempty">
This text should be substituted.
<paragraph>
A paragraph. \n\
<substitution_reference refname="empty">
empty
<substitution_reference refname="nonempty">
nonempty