plop 

The plop element is an indeterminate slide attached to a single note. The plop element appears before the main note and comes from above the main pitch.

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
line-shape line-shape optional
line-type line-type optional
placement above-below optional
relative-x tenths optional
relative-y tenths optional

Source 

<xs:element name="plop" type="empty-line">
  <xs:annotation>
    <xs:documentation>The plop element is an indeterminate slide attached to a single note. The plop element appears before the main note and comes from above the main pitch.</xs:documentation>
  </xs:annotation>
</xs:element>

Sample