Music Encoding Initiative Guidelines

Module

MEI

Used by

Attribute ClassesThese class-based attributes use data.STAFFREL

att.placementRelEvent/@placeCaptures the placement of the item with respect to the event with which it is associated.

att.placementRelStaff/@placeCaptures the placement of the item with respect to the staff with which it is associated.

Data TypesThese other Data Types reference data.STAFFREL

data.PLACEMENTLocation information.

Constraints

The @staff attribute must contain 2 numerically-adjacent integer values.

Staves and are not adjacent.

Declaration


                                 <macroSpec ident="data.STAFFREL" module="MEI" type="dt">
                                    
                                    <desc xml:lang="en">Location of musical material relative to a staff.</desc>
                                    
                                    <content>
                                       
                                       <rng:choice>
                                          
                                          <rng:ref name="data.STAFFREL.basic"/>
                                          
                                          <rng:ref name="data.STAFFREL.extended"/>
                                          </rng:choice>
                                       </content>
                                    
                                    <constraintSpec ident="between_requires_adjacent_staves" scheme="schematron">
                                       
                                       <constraint>
                                          
                                          <sch:rule context="mei:*[@place eq 'between']">
                                             
                                             <sch:assert test="count(tokenize(normalize-space(string(@staff)), '\s+')) = 2">The @staff
                                                attribute must contain 2 numerically-adjacent integer values.</sch:assert>
                                             
                                             <sch:let name="tokenizedStaff" value="tokenize(normalize-space(string(@staff)), '\s+')"/>
                                             
                                             <sch:let name="maxValue" value="max((number($tokenizedStaff[1]), number($tokenizedStaff[2])))"/>
                                             
                                             <sch:let name="minValue" value="min((number($tokenizedStaff[1]), number($tokenizedStaff[2])))"/>
                                             
                                             <sch:assert test="$maxValue - $minValue = 1">Staves 
                                                <sch:value-of select="$minValue"/> and
                                                
                                                <sch:value-of select="$maxValue"/>
 are not adjacent.</sch:assert>
                                             </sch:rule>
                                          </constraint>
                                       </constraintSpec>
                                    </macroSpec>