!CHAPTER Address and ETag of a Document

All documents in ArangoDB have a document handle. This handle uniquely defines a
document and is managed by ArangoDB. The interface allows you to access the
documents of a collection as:

    db.collection.document("document-handle")

For example: Assume that the document handle, which is stored in the `_id` field
of the document, is `demo/362549` and the document lives in a collection
named @FA{demo}, then that document can be accessed as:

    db.demo.document("demo/362549736")

Because the document handle is unique within the database, you
can leave out the @FA{collection} and use the shortcut:

    db._document("demo/362549736")

Each document also has a document revision or ETag which is returned in the
`_rev` field when requesting a document. The document's key is returned in the
`_key` attribute.