Specifies a reference to a Feature within a site definition.
<Feature Id = "Text"> </Feature>
Id
Required String. Specifies a unique identifier for the feature.
None
SiteFeatures, WebFeatures
Minimum: 0
Maximum: Unbounded
According to the Properties Element page (http://msdn2.microsoft.com/en-us/library/aa979691.aspx),
the Feature Element does have an optional child element:
<Properties> <Property Key = "Text" Value = "Text"> </Property></Properties>