In the section "Quotas and Limits" in
   http://code.google.com/appengine/docs/java/datastore/overview.html
there is a table stating
  »maximum number of values in an index for an entity (1): 1,000«
where (1) is the following footnote:
»An entity uses one value in an index for every column × every row
that refers to the entity, in all indexes. The number of indexes
values for an entity can grow large if an indexed property has
multiple values, requiring multiple rows with repeated values in the
table.«

Can anyone explain what that means?!

It seems that the number of entities referring to a specific entity,
X, will be limited by this limit which means, that a parent entity can
only have a quite limited number of child entities. Is that right?

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