Declaration of a property satisfies the following syntax:

(37)             <property> ::= "property"
                                [ "<" [ <propattr_vals> ] ">" ]
                                <type>
                                <identifier>
                                ";"

Property declaration consists of an optional list of property attribute assignments, the property type and the property name. Property types are described in Section 10.13, “Property and Argument Types”.

It's possible to declare properties with the same name in both base and derived class. The IDL will treat them as two different properties, and they should be defined as such in the C++ definition of the classes.

Access to the properties in the C++ classes can be public, protected or private, as long as the classes are properly defined to be friends of their metaobjects, as described in Section 4.3.1, “Implementation”. The access is not specified in the IDL.

	Warning
	All class properties must be properly described in the IDL. If you forget to describe some properties, the IDL will be processed and the generated sources will compile without any error, but the properties you forgot to describe will not be serialized, migrated, replicated, or archived at all.

(38)        <propattr_vals> ::= <propattr_val>
                                { "," <propattr_val> }*
(39)         <propattr_val> ::= <boolpropattr_name>
                              | <propattr_name> "=" <const_expr>
(40)    <boolpropattr_name> ::= <scoped_name>
(41)        <propattr_name> ::= <scoped_name>