class Nokogiri::XML::ElementContent

Represents the allowed content in an Element Declaration inside a DTD:

<?xml version="1.0"?><?TEST-STYLE PIDATA?>
<!DOCTYPE staff SYSTEM "staff.dtd" [
   <!ELEMENT div1 (head, (p | list | note)*, div2*)>
]>
</root>

ElementContent represents the binary tree inside the <!ELEMENT> tag shown above that lists the possible content for the div1 tag.