Search Help

Access Constraints


The <Access_Constraints> field allows the author to provide information about any constraints for accessing the service.  This includes any special restrictions, legal prerequisites, limitations and/or warnings on obtaining the service.  Some words that may be used in this field include: Public, In-house, Limited.  Additional detailed instructions on how to access the service can be entered in this field.



  • Multiple lines of text are permitted. Characters may be selected from the UTF-8 character set.
  • The <Access_Constraints> field is highly recommended and may not be repeated.
  • Text should be single spaced with blank lines separating paragraphs.

Registration is required to access the service.


This document should be cited as:
Service Entry Resource Format (SERF) Writer's Guide, 2016.
Global Change Master Directory.
National Aeronautics and Space Administration.

NASA Logo -
Link to Web Site