Subdocuments
Within a WordprocessingML document, it is sometimes necessary to break a large document into two or more separate WordprocessingML document files, allowing each of these files to be distributed, edited, and handled independently.
A book might consist of five chapters, each edited by a separate author. The editor for the book would therefore desire to create six WordprocessingML documents - one for each author to work on their chapter, and a main document which collates the content of the five chapters appropriately.
When a WordprocessingML document is composed of other WordprocessingML documents in this way, the resulting documents are a master document and its subdocuments.
A master document is a document which incorporates one or more subdocuments (as well as optional WordprocessingML content) to create a larger document
A subdocument is a WordprocessingML document—there is no specific information in a document which classifies it as such
Consider a WordprocessingML document, which is being used to write a book:
To allow this document to be written by multiple authors, each chapter in the book is placed in a separate file (the sections highlighted in red below):
The result is three WordprocessingML documents:
A master document (containing the title of the book, the first paragraph, and references to the subdocuments for each chapter)
Two subdocuments (one for each chapter)