Add ScheduledExecution to implementation attribute

To support the new ScheduledExecution implementation type of FMI 3.0.

Author: pmai

docs/5___ssd.adoc

@@ -778,7 +778,7 @@ Implementations *MUST NOT* specify an empty relative URI to indicate a missing i
 
 |implementation |When the referenced component is an FMU that contains multiple implementations [ _for example Co-Simulation and Model Exchange_], this optional attribute can be used to determine which FMU implementation should be employed.
 If the attribute is missing or uses the default value any, the importing tool is free to choose what kind of FMU implementation to use.
-If the value is CoSimulation or ModelExchange the corresponding FMU implementation *MUST* be used.
+If the value is CoSimulation, ModelExchange, or ScheduledExecution the corresponding FMU implementation *MUST* be used.
 It is an error if the specified type of FMU implementation is not present in the FMU.
 |===
 

schema/SystemStructureDescription.xsd

@@ -240,16 +240,18 @@
                             attribute can be used to determine which FMU implementation should be
                             employed.  If the attribute is missing or uses the default value "any",
                             the importing tool is free to choose what kind of FMU implementation
-                            to use.  If the value is "CoSimulation" or "ModelExchange" the corresponding
-                            FMU implementation must be used.  It is an error if the specified type
-                            of FMU implementation is not present in the FMU.
+                            to use.  If the value is "CoSimulation", "ModelExchange", or
+                            "ScheduledExecution", the corresponding FMU implementation must be used.
+                            It is an error if the specified type of FMU implementation is not present
+                            in the FMU.
                         </xs:documentation>
                     </xs:annotation>
                     <xs:simpleType>
                         <xs:restriction base="xs:string">
                             <xs:enumeration value="any"/>
                             <xs:enumeration value="ModelExchange"/>
                             <xs:enumeration value="CoSimulation"/>
+                            <xs:enumeration value="ScheduledExecution"/>
                         </xs:restriction>
                     </xs:simpleType>
                 </xs:attribute>

schema/SystemStructureDescription11.xsd

@@ -249,16 +249,18 @@
                             attribute can be used to determine which FMU implementation should be
                             employed.  If the attribute is missing or uses the default value "any",
                             the importing tool is free to choose what kind of FMU implementation
-                            to use.  If the value is "CoSimulation" or "ModelExchange" the corresponding
-                            FMU implementation must be used.  It is an error if the specified type
-                            of FMU implementation is not present in the FMU.
+                            to use.  If the value is "CoSimulation", "ModelExchange", or
+                            "ScheduledExecution", the corresponding FMU implementation must be used.
+                            It is an error if the specified type of FMU implementation is not present
+                            in the FMU.
                         </xs:documentation>
                     </xs:annotation>
                     <xs:simpleType>
                         <xs:restriction base="xs:string">
                             <xs:enumeration value="any"/>
                             <xs:enumeration value="ModelExchange"/>
                             <xs:enumeration value="CoSimulation"/>
+                            <xs:enumeration value="ScheduledExecution"/>
                         </xs:restriction>
                     </xs:simpleType>
                 </xs:attribute>