Is it possible to restrict elements to a max occur in a “choice” block?

Question

I need to solve the following problem.

//pseudo algorithm

• you have four elements: elm1, elm2, elm3, elm4
• elm1 occurs 0-2 times
• elm2 o

Answer 1

You can allways use the minOccurs and maxOccurs attributes in a XSD-schema. This will allow you to set the number of elements which are allowed in a specific element. More info in this tutorial

An example of how this is used in a choice-block is represented here, like this: