<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:element name="constants">
    <xs:complexType>
      <xs:sequence minOccurs="0" maxOccurs="unbounded">
        <xs:element name="constant">
          <xs:complexType>
            <xs:simpleContent>
              <xs:extension base="xs:float">
                <xs:attribute name="info" type="xs:string" />
                <xs:attribute name="name" type="xs:string" />
                <xs:attribute name="units" type="xs:string" />
                <xs:attribute name="kind" type="xs:string" />
              </xs:extension>
            </xs:simpleContent>
          </xs:complexType>
        </xs:element>
      </xs:sequence>
      <xs:attribute name="id" type="xs:ID" use="required" />
    </xs:complexType>
  </xs:element>
</xs:schema>