View source for HTML superclass-subclass list extractor

HTML superclass-subclass list extractor starts with menu option '''File > Extract > HTML structures > HTML superclass-subclass list extractor...''' or selecting the extractor as the Drag and Drop extractor and dropping HTML fragments from WWW browser.

Extractor read HTML file or fragment and interprets encountered HTML ordered and unordered lists as nested superclass-subclass associations. A topic is created for each list element (content of '''li''' element). Created topic is associated to outer list element with super-subclass association. Outer element is considered as a superclass. List structure depth is unlimited. Topic named as '''ListRoot''' is set a superclass of first level topics. As an example consider simple list:

 <ul>
 <li>Mammal</li>
 <ul>
 <li>Cat</li>
 <li>Horse</li>
 <li>Pig</li>
 </ul>
 <li>Bird</li>
 <ul>
 <li>Parrot</li>
 <li>Duck</li>
 </ul>
 </ul>

If given to the extractor, this HTML fragment generates topics for '''Mammal''' and '''Cat''' among others and '''Mammal''' topic is set as a superclass of the '''Cat'''. '''Mammal''' and '''Bird''' are subclasses of '''ListRoot''' topic.

There is also another similar extractor named [[HTML instance list extractor]] generating instance-of relations instead of superclass-subclass relations.