Removed the OWL API comment.

Change URIs to w3id
https://w3id.org/def/saref4envi
https://w3id.org/def/saref4bldg

Added disjoints

hasFrequencyMeasurment renamed

diagrams updated and examples updated

Added comments for op, dp and individuals.

Added isDefinedBy for reused entities

rdfs:comment added for all classes in envi

change prefix to s4envi
change axiom in PhysicalObject about contains

and the axiom in Device

first version of the bldg with axioms in classes.

real ranges and complex numbers should be refined.

Added placeholders for comments.

Reviewed cardinalities.

Changed individuals to CamelCase.

Renamed some properties.
Added local restrictions to classes.

Added restrictions to System and Device.

Added local restrictions to PhysicalObject.

Added the SAREF namespace.
Removed some namespaces from SDH.