The institutional identifier is used to keep the digital objects created by your institution gathered in a known branch of a data tree. You should take care when first using the METADATA CREATION TOOL. We suggest you use the Library of Congress Marc identifier for your organization padded to eight characters. So, for the ResCarta Foundation, we can lookup the code at the library of Congress site and find that the normalized listing might be wionrfi. Since this is seven characters long we can pad it out to be wionrfi0, by placing a single zero at the end.