An important aspect of many web applications, especially content management systems (CMS), is the storage of primary data. However the extra or secondary data associated with objects, generally called
, also plays an important role. Common examples of metadata include:
information about the creator, author, or editor of a document,
time and date of the creation or last modification of an object,
state of a document in an organizational workflow.
Zope handles metadata very well and supports important standards out-of- the-box. We will see how to use them in this chapter.