<section>

Module
MEI.shared
Attributes
attacca, class, copyof, corresp, decls, evaluate, facs, follows, label, n, next, precedes, prev, resp, restart, sameas, synch, target, targettype, type, when, xlink:actuate, xlink:role, xlink:show, xml:base, xml:id
attaccaIndicates that the performance of the next section should begin immediately following this one. Value conforms to data.BOOLEAN.
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.
decls(optional)Identifies one or more metadata elements (other than classification terms) within the header, which are understood to apply to the element bearing this attribute and its content. One or more values from data.URI, separated by spaces.
evaluate(optional)Specifies the intended meaning when a participant in a relationship is itself a pointer. Allowed values are: "all" (If an element pointed to is itself a pointer, then the target of that pointer will be taken, and so on, until an element is found which is not a pointer.), "one" (If an element pointed to is itself a pointer, then its target (whether a pointer or not) is taken as the target of this pointer.), "none" (No further evaluation of targets is carried out beyond that needed to find the element(s) specified in plist or target attribute.)
facs(optional)Permits the current element to reference a facsimile surface or image zone which corresponds to it. 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.
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.
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.
restart(optional)Indicates that staves begin again with this section. Value conforms to data.BOOLEAN.
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.
target(optional)Identifies passive participants in a relationship; that is, the entities pointed "to". One or more values from data.URI, separated by spaces.
targettype(optional)Characterization of target resource(s) using any convenient classification scheme or typology. 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.
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.
xlink:actuate(optional)Defines whether a link occurs automatically or must be requested by the user. Allowed values are: "onLoad" (Load the target resource(s) immediately.), "onRequest" (Load the target resource(s) upon user request.), "none" (Do not permit loading of the target resource(s).), "other" (Behavior other than allowed by the other values of this attribute.)
xlink:role(optional)Characterization of the relationship between resources. The value of the role attribute must be a URI. Value conforms to data.URI.
xlink:show(optional)Defines how a remote resource is rendered. Allowed values are: "new" (Open in a new window.), "replace" (Load the referenced resource in the same window.), "embed" (Embed the referenced resource at the point of the link.), "none" (Do not permit traversal to the referenced resource.), "other" (Behavior other than permitted by the other values of this attribute.)
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.
(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)Permits the current element to reference a facsimile surface or image zone which corresponds to it. One or more values from data.URI, separated by spaces.
(MEI.shared) Provides attributes for elements which may be associated with particular contextual elements within the header.
decls(optional)Identifies one or more metadata elements (other than classification terms) within the header, which are understood to apply to the element bearing this attribute and its content. One or more values from data.URI, separated by spaces.
(MEI.shared) Attributes common to all pointing/linking elements.
xlink:actuate(optional)Defines whether a link occurs automatically or must be requested by the user. Allowed values are: "onLoad" (Load the target resource(s) immediately.), "onRequest" (Load the target resource(s) upon user request.), "none" (Do not permit loading of the target resource(s).), "other" (Behavior other than allowed by the other values of this attribute.)
xlink:role(optional)Characterization of the relationship between resources. The value of the role attribute must be a URI. Value conforms to data.URI.
xlink:show(optional)Defines how a remote resource is rendered. Allowed values are: "new" (Open in a new window.), "replace" (Load the referenced resource in the same window.), "embed" (Embed the referenced resource at the point of the link.), "none" (Do not permit traversal to the referenced resource.), "other" (Behavior other than permitted by the other values of this attribute.)
target(optional)Identifies passive participants in a relationship; that is, the entities pointed "to". One or more values from data.URI, separated by spaces.
targettype(optional)Characterization of target resource(s) using any convenient classification scheme or typology. Value is a NMTOKEN.
(MEI.analytical) Analytical domain attributes.
(MEI.gestural) Gestural domain attributes.
attaccaIndicates that the performance of the next section should begin immediately following this one. Value conforms to data.BOOLEAN.
(MEI.shared) Logical domain attributes.
(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.visual) Visual domain attributes.
restart(optional)Indicates that staves begin again with this section. Value conforms to data.BOOLEAN.
(MEI.shared) Attributes that deal with resolution of values in plist or target attributes.
evaluate(optional)Specifies the intended meaning when a participant in a relationship is itself a pointer. Allowed values are: "all" (If an element pointed to is itself a pointer, then the target of that pointer will be taken, and so on, until an element is found which is not a pointer.), "one" (If an element pointed to is itself a pointer, then its target (whether a pointer or not) is taken as the target of this pointer.), "none" (No further evaluation of targets is carried out beyond that needed to find the element(s) specified in plist or target attribute.)
Facsimile component declarations.
facs(optional)Permits the current element to reference a facsimile surface or image zone which corresponds to it. One or more values from data.URI, separated by spaces.
Gestural component declarations.
attaccaIndicates that the performance of the next section should begin immediately following this one. Value conforms to data.BOOLEAN.
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.
decls(optional)Identifies one or more metadata elements (other than classification terms) within the header, which are understood to apply to the element bearing this attribute and its content. One or more values from data.URI, separated by spaces.
evaluate(optional)Specifies the intended meaning when a participant in a relationship is itself a pointer. Allowed values are: "all" (If an element pointed to is itself a pointer, then the target of that pointer will be taken, and so on, until an element is found which is not a pointer.), "one" (If an element pointed to is itself a pointer, then its target (whether a pointer or not) is taken as the target of this pointer.), "none" (No further evaluation of targets is carried out beyond that needed to find the element(s) specified in plist or target attribute.)
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.
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.
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.
synch(optional)Points to elements that are synchronous with the current element. One or more values from data.URI, separated by spaces.
target(optional)Identifies passive participants in a relationship; that is, the entities pointed "to". One or more values from data.URI, separated by spaces.
targettype(optional)Characterization of target resource(s) using any convenient classification scheme or typology. 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.
xlink:actuate(optional)Defines whether a link occurs automatically or must be requested by the user. Allowed values are: "onLoad" (Load the target resource(s) immediately.), "onRequest" (Load the target resource(s) upon user request.), "none" (Do not permit loading of the target resource(s).), "other" (Behavior other than allowed by the other values of this attribute.)
xlink:role(optional)Characterization of the relationship between resources. The value of the role attribute must be a URI. Value conforms to data.URI.
xlink:show(optional)Defines how a remote resource is rendered. Allowed values are: "new" (Open in a new window.), "replace" (Load the referenced resource in the same window.), "embed" (Embed the referenced resource at the point of the link.), "none" (Do not permit traversal to the referenced resource.), "other" (Behavior other than permitted by the other values of this attribute.)
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.
Visual component declarations.
restart(optional)Indicates that staves begin again with this section. Value conforms to data.BOOLEAN.
Member of
model.sectionLikeGroups elements that represent a segment of music notation.
Contained By
(MEI.shared) Groups elements that represent a segment of music notation.
endingAlternative ending for a repeated passage of music; i.e., prima volta, seconda volta, etc.
metaMarkA graphical or textual statement with additional / explanatory information about the musical text. The textual consequences of this intervention are encoded independently via other means; that is, with elements such as <add>, <del>, etc.
(MEI.shared) Groups elements that may appear as part of a score.
partAn alternative visual rendition of the score from the point of view of a particular performer (or group of performers).
scoreFull score view of the musical content.
(MEI.shared) Groups elements that may appear as part of a section.
abbr(abbreviation) – A generic element for 1) a shortened form of a word, including an acronym or 2) a shorthand notation.
add(addition) – Marks an addition to the text.
corr(correction) – Contains the correct form of an apparent erroneous passage.
damageContains an area of damage to the physical medium.
del(deletion) – Contains information deleted, marked as deleted, or otherwise indicated as superfluous or spurious in the copy text by an author, scribe, annotator, or corrector.
expan(expansion) – Contains the expansion of an abbreviation.
lem(lemma) – Contains the lemma, or base text, of a textual variation.
orig(original) – Contains material which is marked as following the original, rather than being normalized or corrected.
rdg(reading) – Contains a single reading within a textual variation.
reg(regularization) – Contains 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.
sectionSegment of music data.
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.
lem(lemma) – Contains the lemma, or base text, of a textual variation.
rdg(reading) – Contains a single reading within a textual variation.
Editorial and transcriptional component declarations.
abbr(abbreviation) – A generic element for 1) a shortened form of a word, including an acronym or 2) a shorthand notation.
add(addition) – Marks an addition to the text.
corr(correction) – Contains the correct form of an apparent erroneous passage.
damageContains an area of damage to the physical medium.
del(deletion) – Contains information deleted, marked as deleted, or otherwise indicated as superfluous or spurious in the copy text by an author, scribe, annotator, or corrector.
expan(expansion) – Contains the expansion of an abbreviation.
metaMarkA graphical or textual statement with additional / explanatory information about the musical text. The textual consequences of this intervention are encoded independently via other means; that is, with elements such as <add>, <del>, etc.
orig(original) – Contains material which is marked as following the original, rather than being normalized or corrected.
reg(regularization) – Contains 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.
Component declarations that are shared between two or more modules.
endingAlternative ending for a repeated passage of music; i.e., prima volta, seconda volta, etc.
partAn alternative visual rendition of the score from the point of view of a particular performer (or group of performers).
scoreFull score view of the musical content.
sectionSegment of music data.
May Contain
expansionIndicates how a section may be programmatically expanded into its 'through-composed' form.
(MEI.critapp) Groups elements that contain a critical apparatus entry.
app(apparatus) – Contains 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.
subst(substitution) – Groups 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.
add(addition) – Marks an addition to the text.
corr(correction) – Contains the correct form of an apparent erroneous passage.
damageContains an area of damage to the physical medium.
del(deletion) – Contains 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.
orig(original) – Contains material which is marked as following the original, rather than being normalized or corrected.
reg(regularization) – Contains 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.
(MEI.shared) Groups annotation-like elements.
annot(annotation) – Provides a statement explaining the text or indicating the basis for an assertion.
(MEI.shared) Groups milestone-style elements found in music notation.
cb(column beginning) – An empty formatting element that forces text to begin in a new column.
colLayout(column layout) – An empty formatting element that signals the start of columnar layout.
sb(system beginning) – An empty formatting element that forces musical notation to begin on a new line.
(MEI.shared) Groups page beginning-like elements.
pb(page beginning) – An empty formatting element that forces text to begin on a new page.
(MEI.shared) Collects elements that express a relationship.
relationDescribes a relationship or linkage amongst entities.
relationListGathers relation elements.
(MEI.shared) Groups elements that may appear as part of a section.
(MEI.cmn) Groups elements that may appear as part of a section.
(MEI.cmn) Groups CMN measure-like elements.
measureUnit of musical time consisting of a fixed number of note values of a given type, as determined by the prevailing meter, and delimited in musical notation by bar lines.
(MEI.shared) Groups elements that represent alternative endings.
endingAlternative ending for a repeated passage of music; i.e., prima volta, seconda volta, etc.
(MEI.shared) Groups elements that provide score meta-information.
scoreDef(score definition) – Container for score meta-information.
(MEI.shared) Groups elements that represent a segment of music notation.
sectionSegment of music data.
(MEI.shared) Groups elements that may appear as part of a section in the mensural and neume repertoires.
(MEI.mensural) Groups elements that may appear as part of a section in the mensural repertoire.
(MEI.neumes) Groups elements that may appear as part of a section in the neume repertoire.
(MEI.shared) Groups elements that function like staves.
staffA group of equidistant horizontal lines on which notes are placed in order to represent pitch or a grouping element for individual 'strands' of notes, rests, etc. that may or may not actually be rendered on staff lines; that is, both diastematic and non-diastematic signs.
(MEI.shared) Groups elements that permit declaration of staff properties.
staffDef(staff definition) – Container for staff meta-information.
(MEI.text) Groups elements used to represent generic structural divisions of text.
div(division) – Major structural division of text, such as a preface, chapter or section.
(MEI.usersymbols) Groups elements that function as drawing primitives.
anchoredTextContainer for text that is fixed to a particular page location, regardless of changes made to the layout of the measures around it.
curveA curved line that cannot be represented by a more specific element, such as a slur.
lineA visual line that cannot be represented by a more specific; i.e., semantic, element.
Common Music Notation (CMN) repertoire component declarations.
measureUnit of musical time consisting of a fixed number of note values of a given type, as determined by the prevailing meter, and delimited in musical notation by bar lines.
Critical apparatus component declarations.
app(apparatus) – Contains one or more alternative encodings.
Editorial and transcriptional component declarations.
add(addition) – Marks an addition to the text.
choiceGroups a number of alternative encodings for the same point in a text.
corr(correction) – Contains the correct form of an apparent erroneous passage.
damageContains an area of damage to the physical medium.
del(deletion) – Contains 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.
orig(original) – Contains material which is marked as following the original, rather than being normalized or corrected.
reg(regularization) – Contains 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.
subst(substitution) – Groups 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.
annot(annotation) – Provides a statement explaining the text or indicating the basis for an assertion.
cb(column beginning) – An empty formatting element that forces text to begin in a new column.
colLayout(column layout) – An empty formatting element that signals the start of columnar layout.
div(division) – Major structural division of text, such as a preface, chapter or section.
endingAlternative ending for a repeated passage of music; i.e., prima volta, seconda volta, etc.
expansionIndicates how a section may be programmatically expanded into its 'through-composed' form.
pb(page beginning) – An empty formatting element that forces text to begin on a new page.
relationDescribes a relationship or linkage amongst entities.
relationListGathers relation elements.
sb(system beginning) – An empty formatting element that forces musical notation to begin on a new line.
scoreDef(score definition) – Container for score meta-information.
sectionSegment of music data.
staffA group of equidistant horizontal lines on which notes are placed in order to represent pitch or a grouping element for individual 'strands' of notes, rests, etc. that may or may not actually be rendered on staff lines; that is, both diastematic and non-diastematic signs.
staffDef(staff definition) – Container for staff meta-information.
User-defined symbols component declarations.
anchoredTextContainer for text that is fixed to a particular page location, regardless of changes made to the layout of the measures around it.
curveA curved line that cannot be represented by a more specific element, such as a slur.
lineA visual line that cannot be represented by a more specific; i.e., semantic, element.
Remarks

This element functions as a container for actual music data. Pointing attributes make it possible to connect this element to other internal or external entities, such as media objects or annotations.

Constraints

A section containing an expansion element must have descendant section, ending, or rdg elements.

Declaration
<elementSpec ident="section" module="MEI.shared">
<desc>Segment of music data.</desc>
<classes>
<memberOf key="att.common"/>
<memberOf key="att.facsimile"/>
<memberOf key="att.metadataPointing"/>
<memberOf key="att.pointing"/>
<memberOf key="att.section.anl"/>
<memberOf key="att.section.ges"/>
<memberOf key="att.section.log"/>
<memberOf key="att.section.vis"/>
<memberOf key="att.targetEval"/>
<memberOf key="model.sectionLike"/>
</classes>
<content>
<rng:zeroOrMore>
<rng:ref name="expansion"/>
</rng:zeroOrMore>
<rng:zeroOrMore>
<rng:choice>
<rng:ref name="model.annotLike"/>
<rng:ref name="model.appLike"/>
<rng:ref name="model.divLike"/>
<rng:ref name="model.editLike"/>
<rng:ref name="model.graphicPrimitiveLike"/>
<rng:ref name="model.milestoneLike.music"/>
<rng:ref name="model.relationLike"/>
<rng:ref name="model.sectionPart"/>
<rng:ref name="model.transcriptionLike"/>
</rng:choice>
</rng:zeroOrMore>
</content>
<constraintSpec ident="Check_sectionexpansion" scheme="isoschematron">
<constraint>
<sch:rule context="mei:section[mei:expansion]">
<sch:assert test="descendant::mei:section|descendant::mei:ending|descendant::mei:rdg">A section containing an expansion element must have descendant section, ending, or rdg elements.</sch:assert>
</sch:rule>
</constraint>
</constraintSpec>
<remarks>
<p>This element functions as a container for actual music data. Pointing attributes make it possible to connect this element to other internal or external entities, such as media objects or annotations.</p>
</remarks>
</elementSpec>