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JT tech review 1

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Original file line number	Diff line number	Diff line change
`@@ -297,8 +297,10 @@ MongoDB.`
`297`	`297`	When you apply the ``DocumentModel`` trait to a model class, you must
`298`	`298`	`declare the following properties in your class:`
`299`	`299`
`300`		-- ``$primaryKey``: Defines the field that uniquely identifies a MongoDB document
`301`		-- ``$keyType``: Defines the type of the primary key value
	`300`	+- ``$primaryKey = '_id'``, because the ``_id`` field uniquely
	`301`	`+ identifies MongoDB documents`
	`302`	+- ``$keyType = 'string'``, because {+odm-short+} casts MongoDB
	`303`	+ ``ObjectId`` values to type ``string``
`302`	`304`
`303`	`305`	`Extended Class Example`
`304`	`306`	`~~~~~~~~~~~~~~~~~~~~~~`

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