control 

Indicates whether or not a bar line is "controlling"; that is, if it
indicates a point of alignment across all the parts. Bar lines within a score are usually
controlling; that is, they "line up". Bar lines within parts may or may not be
controlling. When applied to <measure>, this attribute indicates the nature of the
right barline but not the left.

Attribute Information

Used By

Attribute Group mei:mei_att.meterconformance.bar.attribute.control

Source 

<xs:attribute name="control" type="mei:mei_data.BOOLEAN">
  <xs:annotation>
    <xs:documentation>Indicates whether or not a bar line is "controlling"; that is, if it indicates a point of alignment across all the parts. Bar lines within a score are usually controlling; that is, they "line up". Bar lines within parts may or may not be controlling. When applied to <measure>, this attribute indicates the nature of the right barline but not the left.</xs:documentation>
  </xs:annotation>
</xs:attribute>

Sample