The string type is used with tablature notation, regular notation (where it is often circled), and chord diagrams. String numbers start with 1 for the highest string.
<xs:complexType name="string"><xs:annotation><xs:documentation>The string type is used with tablature notation, regular notation (where it is often circled), and chord diagrams. String numbers start with 1 for the highest string.</xs:documentation></xs:annotation><xs:simpleContent><xs:extension base="string-number"><xs:attributeGroup ref="print-style"/><xs:attributeGroup ref="placement"/></xs:extension></xs:simpleContent></xs:complexType>