analog(optional)Contains a reference to a field or element in another descriptive encoding system
                                             to
                                             which this MEI element is comparable.
                                             Value is plain text.
                                             
                                    auth(optional)A name or label associated with a controlled vocabulary or other authoritative source
                                             for this element or its content.
                                             Value is plain text.
                                             
                                    auth.uri(optional)A web-accessible location of the controlled vocabulary or other authoritative source
                                             of identification or definition for this element or its content. This attribute may
                                             contain a complete URI or a partial URI which is completed by the value of the codedval
                                             attribute.
                                             Value conforms to data.URI.
                                              
                                    cert(optional)Signifies the degree of certainty or precision associated with a feature.
                                             Value conforms to data.CERTAINTY.
                                              
                                    class(optional)Contains one or more URIs which denote classification terms that apply to the entity
                                             bearing this attribute.
                                             One or more values from data.URI, separated by spaces.
                                              
                                    codedval(optional)A value that represents or identifies other data. Often, it is a primary key in the
                                             database or a unique value in the coded list identified by the auth or
                                             auth.uri attributes.
                                             One or more values of datatype NMTOKEN, separated by spaces.
                                             
                                    copyof(optional)Points to an element of which the current element is a copy.
                                             Value conforms to data.URI.
                                              
                                    corresp(optional)Used to point to other elements that correspond to this one in a generic
                                             fashion.
                                             One or more values from data.URI, separated by spaces.
                                              
                                    enddate(optional)Contains the end point of a date range in standard ISO form.
                                             Value conforms to data.ISODATE.
                                              
                                    evidence(optional)Indicates the nature of the evidence supporting the reliability or accuracy of the
                                             intervention or interpretation. Suggested values are: "internal" (There is evidence within the document to support the intervention.),  "external" (There is evidence outside the document to support the intervention.),  "conjecture" (The assertion has been made by the editor, cataloguer, or scholar on the basis of
                                                their expertise.)
                                    follows(optional)points to one or more events in a user-defined collection that are known to be
                                             predecessors of the current element.
                                             One or more values from data.URI, separated by spaces.
                                              
                                    isodate(optional)Provides the value of a textual date in standard ISO form.
                                             Value conforms to data.ISODATE.
                                              
                                    label(optional)Captures text to be used to generate a label for the element to which it’s attached,
                                             a
                                             "tool tip" or prefatory text, for example. Should not be used to record document
                                             content.
                                             Value is plain text.
                                             
                                    n(optional)Provides a number-like designation that indicates an element’s position in a sequence
                                             of similar elements. May not contain space characters.
                                             Value conforms to data.WORD.
                                              
                                    next(optional)Used to point to the next event(s) in a user-defined collection.
                                             One or more values from data.URI, separated by spaces.
                                              
                                    nonfiling(optional)Holds the number of initial characters (such as those constituting an article or
                                             preposition) that should not be used for sorting a title or name.
                                             Value is a positive integer.
                                             
                                    notafter(optional)Contains an upper boundary for an uncertain date in standard ISO form.
                                             Value conforms to data.ISODATE.
                                              
                                    notbefore(optional)Contains a lower boundary, in standard ISO form, for an uncertain date.
                                             Value conforms to data.ISODATE.
                                              
                                    nymref(optional)Used to record a pointer to the regularized form of the name elsewhere in the
                                             document.
                                             Value conforms to data.URI.
                                              
                                    precedes(optional)Points to one or more events in a user-defined collection that are known to be
                                             successors of the current element.
                                             One or more values from data.URI, separated by spaces.
                                              
                                    prev(optional)Points to the previous event(s) in a user-defined collection.
                                             One or more values from data.URI, separated by spaces.
                                              
                                    resp(optional)Indicates the agent(s) responsible for some aspect of the text’s transcription,
                                             editing, or encoding. Its value must point to one or more identifiers declared in
                                             the
                                             document header.
                                             One or more values from data.URI, separated by spaces.
                                              
                                    role(optional)Used to specify further information about the entity referenced by this name, for
                                             example, the occupation of a person or the status of a place.
                                             Value is plain text.
                                             
                                    sameas(optional)Points to an element that is the same as the current element but is not a literal
                                             copy
                                             of the current element.
                                             One or more values from data.URI, separated by spaces.
                                              
                                    source(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 or manifestationelement located in the document header.
                                             One or more values from data.URI, separated by spaces.
                                              
                                    startdate(optional)Contains the starting point of a date range in standard ISO form.
                                             Value conforms to data.ISODATE.
                                              
                                    synch(optional)Points to elements that are synchronous with the current element.
                                             One or more values from data.URI, separated by spaces.
                                              
                                    translit(optional)Specifies the transliteration technique used.
                                             Value is a NMTOKEN.
                                              
                                    type(optional)Designation which characterizes the element in some sense, using any convenient
                                             classification scheme or typology that employs single-token labels.
                                             One or more values of datatype NMTOKEN, separated by spaces.
                                             
                                    xml:base(optional)Provides a base URI reference with which applications can resolve relative URI
                                             references into absolute URI references.
                                             Value conforms to data.URI.
                                              
                                    xml: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.
                                             Value is a valid xml:id.
                                              
                                    xml:lang(optional)Identifies the language of the element’s content. The values for this attribute are
                                             language 'tags' as defined in BCP 47. All language tags that make use of private use
                                             sub-tags must be documented in a corresponding language element in the MEI header
                                             whose id
                                             attribute is the same as the language tag’s value.
                                             Value is a language.