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R301 / Mc:Mc-1
Title Block Pattern is scaled to look good in zero, one or many Sheet Size Group
Sheet Size Group scales for appearance zero, one or many Title Block Pattern
A given Title Block Pattern can be scaled to look nicely (not take up too much space and still display contents legibly) in the Sheet sizes defined by a Sheet Size Group. For each Sheet Size Group where the Title Block Pattern might be used, it would have a different scale and all of its internal Boxes would size differently.
It is possible to define a Title Block Pattern without necessarily scaling it, though this would be unusual as it would get used. But there may be some benefit in defining a Title Block Pattern in advance of employing it.
Similarly a Sheet Size Group may exist that doesn’t support any Title Block Pattern. This could be the case in a project were title blocks are not used at all.