<element name="LB">
<a:documentation
xmlns:a="http://relaxng.org/ns/compatibility/annotations/1.0">lb marks
the start of a new (typographic) line in some edition or version of a
text.</a:documentation>
<ref name="L"/>
<ref name="RESEARCHNOTE"/>
</element>
In Writing Schema
<element name="LB">
<a:documentation
xmlns:a="http://relaxng.org/ns/compatibility/annotations/1.0">lb marks
the start of a new (typographic) line in some edition or version of a
text.</a:documentation>
<oneOrMore>
<choice>
<text/>
<ref name="L"/>
<ref name="QUOTE"/>
<ref name="RESEARCHNOTE"/>
</choice>
</oneOrMore>
</element>
In Bio Schema
In Writing Schema
Question:
Based on definition, shouldn't LB be empty?