The OptimisticConcurrencyControl term in the Core vocabulary currently defines a complex type that contains a single collection-valued property:

<Term Name="OptimisticConcurrencyControl" Type="Core.OptimisticConcurrencyControlType" AppliesTo="EntitySet">
<Annotation Term="Core.Description" String="If present, the annotated entity set uses optimistic concurrency control" />
</Term>
<ComplexType Name="OptimisticConcurrencyControlType">
<Property Name="ETagDependsOn" Type="Collection(Edm.PropertyPath)" Nullable="true">
<Annotation Term="Core.Description" String="The ETag is computed from these properties" />
</Property>
</ComplexType>

This intermediate complex type means that applying the vocabulary requires an extra <Record> and <PropertyValue> wrapper:

<EntitySet Name="Entities" Type="Self.Entity">
<Annotation Term="Core.OptimisticConcurrencyControl">
<Record>
<PropertyValue Name="ETagDependsOn">
<Collection>
<PropertyPath>LastModified</PropertyPath>
</Collection>
</PropertyValue>
</Record>
</Annotation>
</EntitySet>

This is unnecessarily cumbersome. We can remove the extra complex type and just create a term whose type is Collection(Edm.NavigationPropertyPath), as in:

<Term Name="OptimisticConcurrencyControlProperties" Type="Collection(Edm.PropertyPath)" AppliesTo="EntitySet">
<Annotation Term="Core.Description" String="The set of properties that are used to compute the ETag" />
</Term>

Which would be applied much more simply as:

<EntitySet Name="Entities" Type="Self.Entity">
<Annotation Term="Core.OptimisticConcurrencyControlProperties">
<Collection>
<PropertyPath>LastModified</PropertyPath>
</Collection>
</Annotation>
</EntitySet>

I think these annotations will be common, so having a simpler way to express is significant.