Remember positions of entities and relationships

[chippan1967]

I would like the ERD to open with the entities and relationships shown in the same position as when I closed the diagram.
Suggestion : for each entity and relationship store some optional position information in the .erd file
e.g.
entity Book 1,1 {
BookID : integer key
Title : varchar(256)
}

entity Person 1,3 {
PersonID : integer key
Name : varchar(256)
}

relationship Writes 2,2 {
Person[n] -> Book[n]
}

According to what I've been able to research, there doesn't seem to be an accepted and defined standard for the .erd file format, so each tool can define it's own .erd format.