Known Properties for a given source. There may be many of these per source.

General Info
Name	SourceProperty
Owner	schedblock
Visibility	public
Is Active	false
Is Abstract	false

Relations
Name	Type	Begins	Ends
unnamed	Association	SourceProperty	FieldSource

Attributes
Name	Type	Classifier	Default Value
sourceFrequency	Frequency	SourceProperty
sourceFluxI	Flux	SourceProperty
sourceDiameter	Angle	SourceProperty
sourceFluxQ	Flux	SourceProperty
sourceFluxU	Flux	SourceProperty
sourceFluxV	Flux	SourceProperty
visibleMagnitude	Magnitude	SourceProperty
dateOfMeasurement	String	SourceProperty