Observations:

• Filling out a new link and clicking "Save" does not add a new link
• A link is only added by clicking the "+" and creating another, unfilled pair of link fields
• Users are going to be confused by this behavior and expect "Save" to include the last link fields
• Error messages for the link fields are not associated with a specific link, hard to find the problem
• Links without http:// are valid and users will enter them. "Enter a valid URL" does not make it clear what is missing, either. Schema can be added if missing.
• Every time the namespace is saved, the order of the links is reversed.