Editing Attribute Convention for Data Discovery 1-2 Working

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== Alignment with NetCDF and CF Conventions ==
 
== Alignment with NetCDF and CF Conventions ==
The NetCDF User Guide [http://www.unidata.ucar.edu/software/netcdf/docs/netcdf.html (NUG)] provides basic recommendations for creating NetCDF files; the NetCDF Climate and Forecast Metadata Conventions [http://cf-pcmdi.llnl.gov/documents/cf-conventions/latest-cf-conventions-document-1/ (CF)]  provides more specific guidance. The ACDD builds upon and is compatible with these conventions; it may refine the definition of some terms in those conventions, but does not preclude the use of any attributes defined by the NUG or CF.  
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The NetCDF User Guide [http://www.unidata.ucar.edu/software/netcdf/docs/netcdf.html (NUG)] provides basic recommendations for creating NetCDF files; the NetCDF Climate and Forecast Metadata Conventions [http://cf-pcmdi.llnl.gov/documents/cf-conventions/latest-cf-conventions-document-1/ (CF)]  provide more specific guidance. The ACDD builds upon and is compatible with these conventions; it may refine the definition of some terms in those conventions, but does not preclude the use of any attributes defined by the NUG or CF.  
  
 
The NUG does not require any global attributes, though it recommends and defines two, title and history; CF specifies many more. ACDD 1.2 adopts all CF 1.6 global attributes with the exception of 'institution'; we specify 'creator_institution' and 'publisher_institution', to provide more provenance information. We also modify the syntax of the 'Conventions' attribute; we adopt the NUG recommendation to supply all conventions in a single attribute. This change has been approved by the CF Conventions Committee and will be part of CF 1.7, which is not yet published.
 
The NUG does not require any global attributes, though it recommends and defines two, title and history; CF specifies many more. ACDD 1.2 adopts all CF 1.6 global attributes with the exception of 'institution'; we specify 'creator_institution' and 'publisher_institution', to provide more provenance information. We also modify the syntax of the 'Conventions' attribute; we adopt the NUG recommendation to supply all conventions in a single attribute. This change has been approved by the CF Conventions Committee and will be part of CF 1.7, which is not yet published.

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