Name	Type	Attributes	Definition
sample_id	string	required, identifier, nullable	"Sample ID assigned by submitter, unique within study. If possible, a persistent sample ID linked to INSDC or similar repository study should be used.
"
sample_type	string	required, nullable	The way the sample was obtained, e.g. fine-needle aspirate, organ harvest, peripheral venous puncture
tissue	:ref:`Ontology <OntoVoc>`	required, nullable	The actual tissue sampled, e.g. lymph node, liver, peripheral blood
anatomic_site	string	required, nullable	The anatomic location of the tissue, e.g. Inguinal, femur
disease_state_sample	string	required, nullable	Histopathologic evaluation of the sample
collection_time_point_relative	number	required, nullable	Time point at which sample was taken, relative to `Collection time event`
collection_time_point_relative_unit	:ref:`Ontology <OntoVoc>`	required, nullable	Unit of Sample collection time
collection_time_point_reference	string	required, nullable	Event in the study schedule to which `Sample collection time` relates to
biomaterial_provider	string	required, nullable	Name and address of the entity providing the sample