Who wrote article with title X?
What is the name of author X?
How many pages does article with title X have?
Which are the co-authors of article X?
What is the title of article X?
What is the sub-title of article X?
To which collection does article X belong?
What is the name of collection X?
An article has just one title.
An article may have a sub-title.
An article may belong to a collection.
An article has at least 1 page.
An article has at least one author.
An article may have co-authors.
What articles does a collection contain?
Who are the authors of article X?
Who are the co-authors of article X?
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http://ontologydesignpatterns.org/wiki/Image:Article.xml
In which collection was this this article published?
In which book was this this article published?
In which CD was this this article published?
How many pages does a book contain?
What is the name of a collection?
When was a collection published?
A collection has a publishing year.
What is the name and collection type of the collection in which a certain article was published?
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http://ontologydesignpatterns.org/wiki/images/3/34/BooksAndCDs.xml
'Ontology Design Patterns'