mei:gap 

Indicates a point where material has been omitted in a transcription,
whether as part of sampling practice or for editorial reasons described in the MEI
header.

Element Information

Model

Attributes

QName Type Fixed Default Use Inheritable Annotation
cert mei:mei_data.CERTAINTY optional 
Signifies the degree of certainty or precision associated with a
feature.
evidence xs:NMTOKEN optional 
Indicates the nature of the evidence supporting the reliability or
accuracy of the intervention or interpretation. Suggested values include: 'internal',
'external', 'conjecture'.
extent xs:string optional 
Indicates the extent of damage or omission.
hand mei:mei_data.URI optional 
Signifies the hand responsible for an action. The value must be the ID of
a <hand> element declared in the header.
label xs:string optional 
Provides a name or label for an element. The value may be any
string.
n optional 
Provides a number-like designation for an element.
reason xs:string optional 
Holds a short phrase describing the reason for missing textual material
(gap), why material is supplied (supplied), or why transcription is difficult
(unclear).
resp restriction of list of mei:mei_data.URI optional 
Indicates the agent(s) responsible for some aspect of the text's creation,
transcription, editing, or encoding. Its value must point to one or more identifiers
declared in the document header.
source restriction of list of mei:mei_data.URI optional 
Contains a list of one or more pointers indicating the sources which
attest to a given reading. Each value should correspond to the ID of a <source>
element located in the document header.
unit union of(xs:NMTOKEN, restriction of xs:token, restriction of xs:token, restriction of xs:token, restriction of xs:token, restriction of xs:token, restriction of xs:token, restriction of xs:token, restriction of xs:token, restriction of xs:token, restriction of xs:token, restriction of xs:token, restriction of xs:token, restriction of xs:token) optional 
Indicates the unit of measurement. Suggested values include: 1] byte; 2]
char; 3] cm; 4] in; 5] issue; 6] mm; 7] page; 8] pc; 9] pt; 10] px; 11] record; 12] vol;
13] vu
xml:base mei:mei_data.URI optional 
Provides a base URI reference with which applications can resolve relative
URI references into absolute URI references.
xml:id xs:ID optional 
Regularizes the naming of an element and thus facilitates building links
between it and other resources. Each id attribute within a document must have a unique
value.

Source 

<xs:element name="gap" substitutionGroup="mei:mei_model.transcriptionLike">
  <xs:annotation>
    <xs:documentation>Indicates a point where material has been omitted in a transcription, whether as part of sampling practice or for editorial reasons described in the MEI header.</xs:documentation>
  </xs:annotation>
  <xs:complexType>
    <xs:attributeGroup ref="mei:mei_att.common.attributes"/>
    <xs:attributeGroup ref="mei:mei_att.edit.attributes"/>
    <xs:attributeGroup ref="mei:mei_att.extent.attributes"/>
    <xs:attributeGroup ref="mei:mei_att.handident.attributes"/>
    <xs:attributeGroup ref="mei:mei_att.reasonident.attributes"/>
    <xs:attributeGroup ref="mei:mei_att.measurement.attributes"/>
  </xs:complexType>
</xs:element>

Sample