other-technical 

The other-technical element is used to define any technical indications not yet in the MusicXML format. This allows extended representation, though without application interoperability.

Element Information

Model

Attributes

QName Type Fixed Default Use Inheritable Annotation
color color optional
default-x tenths optional
default-y tenths optional
font-family comma-separated-text optional
font-size font-size optional
font-style font-style optional
font-weight font-weight optional
placement above-below optional
relative-x tenths optional
relative-y tenths optional

Source 

<xs:element name="other-technical" type="placement-text">
  <xs:annotation>
    <xs:documentation>The other-technical element is used to define any technical indications not yet in the MusicXML format. This allows extended representation, though without application interoperability.</xs:documentation>
  </xs:annotation>
</xs:element>

Sample