<tabGrp>

A group of simultaneous tab notes, comparable to a chord in CMN. Rarely, may also contain rests, as in some "German" lute tablatures.
1.1.2 About version 5.1, 7.2.1 Basic Structure, 7.2.2 Vertical Organisation in German Lute Tablature
Module
MEI.stringtab
Attributes
class, copyof, corresp, dots, dots.ges, dur, dur.ges, dur.metrical, dur.ppq, dur.real, dur.recip, facs, follows, ho, label, layer, n, next, precedes, prev, resp, sameas, staff, synch, to, tstamp, tstamp.ges, tstamp.real, type, visible, when, x, xml:base, xml:id, y
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.
<tabGrp>att.commonatt.typedatt.classed@class
copyof(optional)Points to an element of which the current element is a copy. Value conforms to data.URI.
<tabGrp>att.commonatt.linking@copyof
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.
<tabGrp>att.commonatt.linking@corresp
dots(optional)Records the number of augmentation dots required by a written dotted duration. Value conforms to data.AUGMENTDOT.
<tabGrp>att.tabGrp.logatt.augmentDots@dots
dots.ges(optional)Number of dots required for a gestural duration when different from that of the written duration. Value conforms to data.AUGMENTDOT.
<tabGrp>att.tabGrp.gesatt.duration.ges@dots.ges
dur(optional)Records the duration of a feature using the relative durational values provided by the data.DURATION datatype. Value conforms to data.DURATION.
<tabGrp>att.tabGrp.logatt.duration.log@dur
dur.ges(optional)Records performed duration information that differs from the written duration; @dur.ges allows the same datatypes as @dur. Values of @dur.ges that require dots should also use @dots.ges. Value conforms to data.DURATION.GESTURAL.
<tabGrp>att.tabGrp.gesatt.duration.ges@dur.ges
dur.metrical(optional)Duration as a count of units provided in the time signature denominator. Value is a decimal number.
<tabGrp>att.tabGrp.gesatt.duration.ges@dur.metrical
dur.ppq(optional)Duration recorded as pulses-per-quarter note, e.g., MIDI clicks or MusicXML divisions. Value is a positive integer, including 0.
<tabGrp>att.tabGrp.gesatt.duration.ges@dur.ppq
dur.real(optional)Duration in seconds, e.g., 1.732. Value is a decimal number.
<tabGrp>att.tabGrp.gesatt.duration.ges@dur.real
dur.recip(optional)Duration as an optionally dotted Humdrum **recip value. Value is a token.
<tabGrp>att.tabGrp.gesatt.duration.ges@dur.recip
facs(optional)Points to one or more images, portions of an image, or surfaces which correspond to the current element. One or more values from data.URI, separated by spaces.
<tabGrp>att.facsimile@facs
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.
<tabGrp>att.commonatt.linking@follows
ho(optional)Records a horizontal adjustment to a feature’s programmatically-determined location in terms of staff interline distance; that is, in units of 1/2 the distance between adjacent staff lines. Value conforms to data.MEASUREMENTSIGNED.
<tabGrp>att.tabGrp.visatt.visualOffset.ho@ho
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.
<tabGrp>att.commonatt.labelled@label
layer(optional)Identifies the layer to which a feature applies. One or more values of datatype positiveInteger, separated by spaces.
<tabGrp>att.tabGrp.logatt.eventatt.layerIdent@layer
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.
<tabGrp>att.commonatt.nNumberLike@n
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.
<tabGrp>att.commonatt.linking@next
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.
<tabGrp>att.commonatt.linking@precedes
prev(optional)Points to the previous event(s) in a user-defined collection. One or more values from data.URI, separated by spaces.
<tabGrp>att.commonatt.linking@prev
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.
<tabGrp>att.commonatt.responsibility@resp
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.
<tabGrp>att.commonatt.linking@sameas
staff(optional)Signifies the staff on which a notated event occurs or to which a control event applies. Mandatory when applicable. One or more values of datatype positiveInteger, separated by spaces.
<tabGrp>att.tabGrp.logatt.eventatt.staffIdent@staff
synch(optional)Points to elements that are synchronous with the current element. One or more values from data.URI, separated by spaces.
<tabGrp>att.commonatt.linking@synch
to(optional)Records a timestamp adjustment of a feature’s programmatically-determined location in terms of musical time; that is, beats. Value conforms to data.TSTAMPOFFSET.
<tabGrp>att.tabGrp.visatt.visualOffset.to@to
tstamp(optional)Encodes the onset time in terms of musical time, i.e., beats[.fractional beat part], as expressed in the written time signature. Value conforms to data.BEAT.
<tabGrp>att.tabGrp.logatt.eventatt.timestamp.log@tstamp
tstamp.ges(optional)Encodes the onset time in terms of musical time, i.e., beats[.fractional beat part], as expressed in the written time signature. Value conforms to data.BEAT.
<tabGrp>att.tabGrp.logatt.eventatt.timestamp.ges@tstamp.ges
tstamp.real(optional)Records the onset time in terms of ISO time. Value conforms to data.ISOTIME.
<tabGrp>att.tabGrp.logatt.eventatt.timestamp.ges@tstamp.real
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.
<tabGrp>att.commonatt.typed@type
visible(optional)Indicates if a feature should be rendered when the notation is presented graphically or sounded when it is presented in an aural form. Value conforms to data.BOOLEAN.
<tabGrp>att.tabGrp.visatt.visibility@visible
when(optional)Indicates the point of occurrence of this feature along a time line. Its value must be the ID of a when element elsewhere in the document. Value conforms to data.URI.
<tabGrp>att.tabGrp.logatt.eventatt.alignment@when
x(optional)Encodes an x coordinate for a feature in an output coordinate system. When it is necessary to record the placement of a feature in a facsimile image, use the facs attribute. Value is a decimal number.
<tabGrp>att.tabGrp.visatt.xy@x
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.
<tabGrp>att.commonatt.basic@xml:base
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.
<tabGrp>att.commonatt.basicatt.id@xml:id
y(optional)Encodes a y coordinate for a feature in an output coordinate system. When it is necessary to record the placement of a feature in a facsimile image, use the facs attribute. Value is a decimal number.
<tabGrp>att.tabGrp.visatt.xy@y
(MEI.shared) Attributes common to many elements.
(MEI.shared) Attributes that form the basis of the att.common class.
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.
(MEI.shared) Attributes that uniquely identify an element.
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.
(MEI.shared)
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.
(MEI.shared) Attributes that specify element-to-element relationships.
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.
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.
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.
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.
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.
synch(optional)Points to elements that are synchronous with the current element. One or more values from data.URI, separated by spaces.
(MEI.shared) Attributes used to supply a number-like designation for an element.
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.
(MEI.shared) Attributes capturing information regarding responsibility for some aspect of the text's creation, transcription, editing, or encoding.
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.
(MEI.shared) Attributes which can be used to classify features.
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.
(MEI.shared) Attributes which can be used to classify features.
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.
(MEI.facsimile) Attributes that associate a feature corresponding with all or part of an image.
facs(optional)Points to one or more images, portions of an image, or surfaces which correspond to the current element. One or more values from data.URI, separated by spaces.
(MEI.stringtab) Logical domain attributes.
(MEI.shared) Attributes that record the number of dots of augmentation.
dots(optional)Records the number of augmentation dots required by a written dotted duration. Value conforms to data.AUGMENTDOT.
(MEI.shared) Attributes that express duration in musical terms.
dur(optional)Records the duration of a feature using the relative durational values provided by the data.DURATION datatype. Value conforms to data.DURATION.
(MEI.shared) Attributes that apply to all written events, , note, chord, rest, etc.
(MEI.performance) Temporal alignment attributes.
when(optional)Indicates the point of occurrence of this feature along a time line. Its value must be the ID of a when element elsewhere in the document. Value conforms to data.URI.
(MEI.shared) Attributes that identify the layer to which a feature applies.
layer(optional)Identifies the layer to which a feature applies. One or more values of datatype positiveInteger, separated by spaces.
(MEI.shared) Attributes for identifying the staff associated with the current feature.
staff(optional)Signifies the staff on which a notated event occurs or to which a control event applies. Mandatory when applicable. One or more values of datatype positiveInteger, separated by spaces.
(MEI.gestural) Attributes that record a performed (as opposed to notated) time stamp.
tstamp.ges(optional)Encodes the onset time in terms of musical time, i.e., beats[.fractional beat part], as expressed in the written time signature. Value conforms to data.BEAT.
tstamp.real(optional)Records the onset time in terms of ISO time. Value conforms to data.ISOTIME.
(MEI.shared) Attributes that record a time stamp in terms of musical time, , beats[.fractional beat part].
tstamp(optional)Encodes the onset time in terms of musical time, i.e., beats[.fractional beat part], as expressed in the written time signature. Value conforms to data.BEAT.
(MEI.visual) Visual domain attributes.
(MEI.shared) Attributes describing whether a feature should be displayed.
visible(optional)Indicates if a feature should be rendered when the notation is presented graphically or sounded when it is presented in an aural form. Value conforms to data.BOOLEAN.
(MEI.shared) Horizontal offset attributes.
ho(optional)Records a horizontal adjustment to a feature’s programmatically-determined location in terms of staff interline distance; that is, in units of 1/2 the distance between adjacent staff lines. Value conforms to data.MEASUREMENTSIGNED.
(MEI.shared) Horizontal offset attributes specified in terms of time.
to(optional)Records a timestamp adjustment of a feature’s programmatically-determined location in terms of musical time; that is, beats. Value conforms to data.TSTAMPOFFSET.
(MEI.shared) Output coordinate attributes. Some elements may have their exact rendered *output* coordinates recorded. x and y attributes indicate where to place the rendered output. Recording the coordinates of a feature in a facsimile requires the use of the facs attribute.
x(optional)Encodes an x coordinate for a feature in an output coordinate system. When it is necessary to record the placement of a feature in a facsimile image, use the facs attribute. Value is a decimal number.
y(optional)Encodes a y coordinate for a feature in an output coordinate system. When it is necessary to record the placement of a feature in a facsimile image, use the facs attribute. Value is a decimal number.
(MEI.gestural) Gestural domain attributes.
(MEI.gestural) Attributes that record performed duration that differs from a feature’s written duration.
dur.ges(optional)Records performed duration information that differs from the written duration; @dur.ges allows the same datatypes as @dur. Values of @dur.ges that require dots should also use @dots.ges. Value conforms to data.DURATION.GESTURAL.
dots.ges(optional)Number of dots required for a gestural duration when different from that of the written duration. Value conforms to data.AUGMENTDOT.
dur.metrical(optional)Duration as a count of units provided in the time signature denominator. Value is a decimal number.
dur.ppq(optional)Duration recorded as pulses-per-quarter note, e.g., MIDI clicks or MusicXML divisions. Value is a positive integer, including 0.
dur.real(optional)Duration in seconds, e.g., 1.732. Value is a decimal number.
dur.recip(optional)Duration as an optionally dotted Humdrum **recip value. Value is a token.
(MEI.analytical) Analytical domain attributes.
Facsimile component declarations.
facs(optional)Points to one or more images, portions of an image, or surfaces which correspond to the current element. One or more values from data.URI, separated by spaces.
Gestural component declarations.
dots.ges(optional)Number of dots required for a gestural duration when different from that of the written duration. Value conforms to data.AUGMENTDOT.
dur.ges(optional)Records performed duration information that differs from the written duration; @dur.ges allows the same datatypes as @dur. Values of @dur.ges that require dots should also use @dots.ges. Value conforms to data.DURATION.GESTURAL.
dur.metrical(optional)Duration as a count of units provided in the time signature denominator. Value is a decimal number.
dur.ppq(optional)Duration recorded as pulses-per-quarter note, e.g., MIDI clicks or MusicXML divisions. Value is a positive integer, including 0.
dur.real(optional)Duration in seconds, e.g., 1.732. Value is a decimal number.
dur.recip(optional)Duration as an optionally dotted Humdrum **recip value. Value is a token.
tstamp.ges(optional)Encodes the onset time in terms of musical time, i.e., beats[.fractional beat part], as expressed in the written time signature. Value conforms to data.BEAT.
tstamp.real(optional)Records the onset time in terms of ISO time. Value conforms to data.ISOTIME.
Performance component declarations.
when(optional)Indicates the point of occurrence of this feature along a time line. Its value must be the ID of a when element elsewhere in the document. Value conforms to data.URI.
Component declarations that are shared between two or more modules.
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.
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.
dots(optional)Records the number of augmentation dots required by a written dotted duration. Value conforms to data.AUGMENTDOT.
dur(optional)Records the duration of a feature using the relative durational values provided by the data.DURATION datatype. Value conforms to data.DURATION.
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.
ho(optional)Records a horizontal adjustment to a feature’s programmatically-determined location in terms of staff interline distance; that is, in units of 1/2 the distance between adjacent staff lines. Value conforms to data.MEASUREMENTSIGNED.
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.
layer(optional)Identifies the layer to which a feature applies. One or more values of datatype positiveInteger, separated by spaces.
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.
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.
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.
staff(optional)Signifies the staff on which a notated event occurs or to which a control event applies. Mandatory when applicable. One or more values of datatype positiveInteger, separated by spaces.
synch(optional)Points to elements that are synchronous with the current element. One or more values from data.URI, separated by spaces.
to(optional)Records a timestamp adjustment of a feature’s programmatically-determined location in terms of musical time; that is, beats. Value conforms to data.TSTAMPOFFSET.
tstamp(optional)Encodes the onset time in terms of musical time, i.e., beats[.fractional beat part], as expressed in the written time signature. Value conforms to data.BEAT.
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.
visible(optional)Indicates if a feature should be rendered when the notation is presented graphically or sounded when it is presented in an aural form. Value conforms to data.BOOLEAN.
x(optional)Encodes an x coordinate for a feature in an output coordinate system. When it is necessary to record the placement of a feature in a facsimile image, use the facs attribute. Value is a decimal number.
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.
y(optional)Encodes a y coordinate for a feature in an output coordinate system. When it is necessary to record the placement of a feature in a facsimile image, use the facs attribute. Value is a decimal number.
Member of
model.eventLikeGroups event elements that occur in all notational repertoires.
Contained By
(MEI.shared) Groups event elements that occur in all notational repertoires.
beamA container for a series of explicitly beamed events that begins and ends entirely within a measure.
graceGrpA container for a sequence of grace notes.
ligatureA mensural notation symbol that combines two or more notes into a single sign.
tupletA group of notes with "irregular" (sometimes called "irrational") rhythmic values, for example, three notes in the time normally occupied by two or nine in the time of five.
(MEI.shared) Groups notated events that may appear at the layer level in all repertoires.
abbrA generic element for 1) a shortened form of a word, including an acronym or 2) a shorthand notation.
addMarks an addition to the text.
corrContains the correct form of an apparent erroneous passage.
damageContains an area of damage to the physical medium.
delContains information deleted, marked as deleted, or otherwise indicated as superfluous or spurious in the copy text by an author, scribe, annotator, or corrector.
expanContains the expansion of an abbreviation.
layerAn independent stream of events on a staff.
lemContains the lemma, or base text, of a textual variation.
oLayerA layer that contains an alternative to material in another layer.
origContains material which is marked as following the original, rather than being normalized or corrected.
rdgContains a single reading within a textual variation.
regContains material which has been regularized or normalized in some sense.
restoreIndicates restoration of material to an earlier state by cancellation of an editorial or authorial marking or instruction.
sicContains apparently incorrect or inaccurate material.
suppliedContains material supplied by the transcriber or editor for any reason.
unclearContains material that cannot be transcribed with certainty because it is illegible or inaudible in the source.
Common Music Notation (CMN) repertoire component declarations.
beamA container for a series of explicitly beamed events that begins and ends entirely within a measure.
graceGrpA container for a sequence of grace notes.
oLayerA layer that contains an alternative to material in another layer.
tupletA group of notes with "irregular" (sometimes called "irrational") rhythmic values, for example, three notes in the time normally occupied by two or nine in the time of five.
Critical apparatus component declarations.
lemContains the lemma, or base text, of a textual variation.
rdgContains a single reading within a textual variation.
Editorial and transcriptional component declarations.
abbrA generic element for 1) a shortened form of a word, including an acronym or 2) a shorthand notation.
addMarks an addition to the text.
corrContains the correct form of an apparent erroneous passage.
damageContains an area of damage to the physical medium.
delContains information deleted, marked as deleted, or otherwise indicated as superfluous or spurious in the copy text by an author, scribe, annotator, or corrector.
expanContains the expansion of an abbreviation.
origContains material which is marked as following the original, rather than being normalized or corrected.
regContains material which has been regularized or normalized in some sense.
restoreIndicates restoration of material to an earlier state by cancellation of an editorial or authorial marking or instruction.
sicContains apparently incorrect or inaccurate material.
suppliedContains material supplied by the transcriber or editor for any reason.
unclearContains material that cannot be transcribed with certainty because it is illegible or inaudible in the source.
Mensural repertoire component declarations.
ligatureA mensural notation symbol that combines two or more notes into a single sign.
Component declarations that are shared between two or more modules.
layerAn independent stream of events on a staff.
May Contain
noteA single pitched event.
restA non-sounding event found in the source being transcribed.
tabDurSymA visual indication of the duration of a tabGrp.
(MEI.critapp) Groups elements that contain a critical apparatus entry.
appContains one or more alternative encodings.
(MEI.edittrans) Groups elements for editorial interventions that may be useful both in transcribing and in authoring processes.
choiceGroups a number of alternative encodings for the same point in a text.
substGroups transcriptional elements when the combination is to be regarded as a single intervention in the text.
(MEI.edittrans) Groups elements used for editorial transcription of pre-existing source materials.
addMarks an addition to the text.
corrContains the correct form of an apparent erroneous passage.
damageContains an area of damage to the physical medium.
delContains information deleted, marked as deleted, or otherwise indicated as superfluous or spurious in the copy text by an author, scribe, annotator, or corrector.
gapIndicates 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.
handShiftMarks the beginning of a passage written in a new hand, or of a change in the scribe, writing style, ink or character of the document hand.
origContains material which is marked as following the original, rather than being normalized or corrected.
regContains material which has been regularized or normalized in some sense.
restoreIndicates restoration of material to an earlier state by cancellation of an editorial or authorial marking or instruction.
sicContains apparently incorrect or inaccurate material.
suppliedContains material supplied by the transcriber or editor for any reason.
unclearContains material that cannot be transcribed with certainty because it is illegible or inaudible in the source.
Critical apparatus component declarations.
appContains one or more alternative encodings.
Editorial and transcriptional component declarations.
addMarks an addition to the text.
choiceGroups a number of alternative encodings for the same point in a text.
corrContains the correct form of an apparent erroneous passage.
damageContains an area of damage to the physical medium.
delContains information deleted, marked as deleted, or otherwise indicated as superfluous or spurious in the copy text by an author, scribe, annotator, or corrector.
gapIndicates 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.
handShiftMarks the beginning of a passage written in a new hand, or of a change in the scribe, writing style, ink or character of the document hand.
origContains material which is marked as following the original, rather than being normalized or corrected.
regContains material which has been regularized or normalized in some sense.
restoreIndicates restoration of material to an earlier state by cancellation of an editorial or authorial marking or instruction.
sicContains apparently incorrect or inaccurate material.
substGroups transcriptional elements when the combination is to be regarded as a single intervention in the text.
suppliedContains material supplied by the transcriber or editor for any reason.
unclearContains material that cannot be transcribed with certainty because it is illegible or inaudible in the source.
Component declarations that are shared between two or more modules.
noteA single pitched event.
restA non-sounding event found in the source being transcribed.
Tablature component declarations.
tabDurSymA visual indication of the duration of a tabGrp.
Constraints

A tabGrp inside of a beam must contain one tabDurSym.

Declaration
<elementSpec ident="tabGrp" module="MEI.stringtab">
<desc xml:lang="en">A group of simultaneous tab notes, comparable to a
<gi scheme="MEI">chord</gi>
in CMN. Rarely, may also contain rests, as in some "German" lute tablatures.</desc>
<classes>
<memberOf key="att.common"/>
<memberOf key="att.facsimile"/>
<memberOf key="att.tabGrp.log"/>
<memberOf key="att.tabGrp.vis"/>
<memberOf key="att.tabGrp.ges"/>
<memberOf key="att.tabGrp.anl"/>
<memberOf key="model.eventLike"/>
</classes>
<content>
<rng:optional>
<rng:ref name="tabDurSym"/>
</rng:optional>
<rng:interleave>
<rng:choice>
<rng:zeroOrMore>
<rng:ref name="note"/>
</rng:zeroOrMore>
<rng:optional>
<rng:ref name="rest"/>
</rng:optional>
</rng:choice>
<rng:zeroOrMore>
<rng:choice>
<!-- alternative: model.chordPart – This would give note and artic -->
<rng:ref name="model.transcriptionLike"/>
<rng:ref name="model.editLike"/>
<rng:ref name="model.appLike"/>
</rng:choice>
</rng:zeroOrMore>
</rng:interleave>
</content>
<constraintSpec ident="check_tabGrp_in_beam" scheme="schematron">
<constraint>
<sch:rule context="mei:tabGrp[ancestor::mei:beam]">
<sch:assert test="count(mei:tabDurSym) = 1" role="warning">A tabGrp inside of a beam must contain one tabDurSym.</sch:assert>
</sch:rule>
</constraint>
</constraintSpec>
</elementSpec>
MEI Version: 6.0-dev(#e3f1ca4)