A provider is typically an MD with an institution affiliation.
Schema:
<?xml version="1.0" encoding="ISO-8859-1" ?> <schema xmlns="http://www.w3.org/2001/XMLSchema" targetNamespace="http://indivo.org/vocab/xml/documents#" xmlns:indivo="http://indivo.org/vocab/xml/documents#" elementFormDefault="qualified"> <complexType name="Provider"> <sequence> <element name="name" type="string" minOccurs="1" maxOccurs="1" /> <element name="institution" type="string" minOccurs="1" maxOccurs="1" /> </sequence> </complexType> <complexType name="LabProvider"> <sequence> <element name="name" type="string" minOccurs="1" maxOccurs="1" /> <element name="address" type="string" minOccurs="1" maxOccurs="1" /> </sequence> </complexType> <complexType name="Signature"> <sequence> <element name="at" type="dateTime" minOccurs="0" maxOccurs="1" /> <element name="provider" type="indivo:Provider" minOccurs="1" maxOccurs="1" /> </sequence> </complexType> </schema>