A user data constraint establishes a requirement that the constrained requests be received over a protected transport layer connection.
用户数据约束(user data constraint)满足了受限的请求应该经由受防护的传输层链接进行传输的需求。
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The only constraint we highlight to users is that using an off-heap store imposes the requirement that objects must be serialized to be placed in BigMemory.
A dmoType attribute on the requirement is used to specify an optional constraint to the target unit or capability type that can be used to fulfill the requirement.