Specifies an ID that is unique to the entire document.
Indicates whether something is above or below another element, such as a note or a notation.
Distinguishes elements that are associated with a system rather than the particular part where the element appears.
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Changes the default-x position of a direction. It indicates that the left-hand side of the direction is aligned with the left-hand side of the time signature. If no time signature is present, the direction is aligned with the left-hand side of the first music notational element in the measure. If a default-x, justify, or halign attribute is present, it overrides this attribute.