Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A document-oriented database is a computer program designed for document-oriented applications. These systems may be implemented as a layer above a relational database or an object database. Notice that both documents have some similar information and some different - but unlike a relational database where each record would have the same set of fields and unused fields might be kept empty, there are no empty 'fields' in either document (record) in this case. This system allows information to be added any time without using storage space for "empty fields" as in relational databases. It is noteworthy here that using XML, YAML or JSON for information storage has advantages similar to document oriented database. In these languages each record can have a non-standard amount of information. Such information is properly called semi structured data.

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