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All materials on DDD specify this as not strict number, but recently came in a scenario that makes a compelling case to think.

Otherwise. Imagine 2 total roots and templates where template - & gt; (1: n) template, document - & gt; (1: N) Paramavlue and finally there is a reference to 2 roots document - & gt; (N: 1) Template .
Gross root barrier ParamValue should not be issued in the context of TemplateParam , only it can be referred to through a transient reference template Received via gross route. Now if I want to apply a rule such as "Each paragraph of the document should mention a valid template related to the template referred to by the document owned by it". Ideally at the DB level, I have to give Paramvalue to template value in the FK, how to do it in DDD pattern ?? The total reasons for a reason are that they act as a single entry point for a group of related institutions to implement their own misgivings. They ensure that an external object can mess with these institutions and potentially violate their inventions.

However, in its special scenario, even if ParamValue maintains a direct reference to TemplateParam, TemplateParam is not risk of being modified by an entity in the document total. The value associated with the parameter for a given document will be modified, but the value per parameter will not be.

To make sure that this is the case, you can make template PRM an irreversible value:

(in C #) 

  public square TemplateParam {private redone name string; Public TemplateParam (string name) {this.name = name; } Public string name {get {return name; Thus you can encapsulate Tempe Param in Param with a risk that the total of the blueprint will break due to "externality of portfolios".  
 Technically it can be said that DDD's total road obstacle can be violated, but I do not believe that unless you make the "external" unit irrevocable and the object graph is the original form By not joining it, then it is in a spirit.

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