Update SDMXStructureConstraint.xsd

typo correction  
#34

schemas/SDMXStructureConstraint.xsd

@@ -74,7 +74,7 @@
 
 	<xs:complexType name="DataConstraintType">
 		<xs:annotation>
-			<xs:documentation>DataConstraintType defines the structure of a data constraint. A data constraint can specify either the available set of keys (DataKeySet) or set of component values (CubeRegion) in a data source, or the allowable keys that can be constructed from a data structure definition. Multiple such constraints may be present for a constrained artefact. For instance, there may be a constraing that specifies the values allowed for the data source (role is "Allowed") which can be used for validation or for constructing a partial code list, whilst another constraing can specify the actual content of a data source (role is "Actual").</xs:documentation>
+			<xs:documentation>DataConstraintType defines the structure of a data constraint. A data constraint can specify either the available set of keys (DataKeySet) or set of component values (CubeRegion) in a data source, or the allowable keys that can be constructed from a data structure definition. Multiple such constraints may be present for a constrained artefact. For instance, there may be a constraint that specifies the values allowed for the data source (role is "Allowed") which can be used for validation or for constructing a partial code list, whilst another constraint can specify the actual content of a data source (role is "Actual").</xs:documentation>
 		</xs:annotation>
 		<xs:complexContent>
 			<xs:extension base="DataConstraintBaseType">