anchor.diff:  metadata,missdata_param,Parameters for Missing Data Equations - ,missdata_param,,,study,character,,,,,
   metadata,resample,Resample Metadata - ,resample,,,study,character,,,,,
   metadata,funding_organization,Funding Organization(s) - ,funding_organization,,,study,character,,,,,
  -site,site_name,Site Name - ,site_name,name for the site,,field,factor,,,,,
  +site,site_name,Site Name - ,site_name,name for the site,field_id,field,factor,,,,,
   site,site_note,Site Notes - ,site_note,,,field,character,,,,,
   site,country,Country - ,country,country of location,,field,factor,,,,,
   site,province,Province - ,state,state or other poltical unit at sub-country level,,field,factor,,,,,
  
positive.code: layer,vwc,Volumetric % Moisture - percent,vwc,,,sample,numeric,value,percent,,,
  layer,soc,Bulk Layer Calculated Soil Organic Carbon Stock - g cm-2,soc,soil organic carbon,,sample,numeric,value,g cm-2,,,
  layer,soc_type,Bulk Layer Calculated Soil Organic Carbon Stock Type - (ccon_type),soc,,,sample,character,method,,,,
  layer,soc_sigma,Bulk Layer Calculated Soil Organic Carbon Stock Standard Deviation - g cm-2,soc,,,sample,numeric,sigma,g cm-2,,,
  layer,soc_method,Bulk Layer Calculated Soil Organic Carbon Stock Method - ,soc,,,sample,character,method,,,,
  layer,c_tot,Bulk Layer Total Carbon - percent,c_tot,carbon concentration in a dry combustion analysis,,sample,numeric,value,percent,,,
  layer,oc,Bulk Layer Organic Carbon - percent,oc,organic carbon either acidification+dry combustion or Walkly-Black,,sample,numeric,value,percent,,,
  
negative.code: site,soc_type,Site Calculated Soil Organic Carbon Stock Type - (ccon_type),soc,,,sample,character,method,,,,
  site,soc_pcount,Site Calculated Soil Organic Carbon Stock Profile Count - ,soc,,,sample,character,method,,,,
  site,soc_depth,Site Calculated Soil Organic Carbon Stock Depth - cm,soc_depth,,,sample,numeric,value,cm,,,
  site,soc_sigma,Site Calculated Soil Organic Carbon Stock Standard Deviation - g cm-2,soc,,,sample,numeric,sigma,,,,
  site,soc_method,Site Calculated Soil Organic Carbon Stock Method - ,soc,,,sample,character,method,,,,
  cluster,cluster_name,Cluster Name - ,cluster_name,,,field,factor,,,,,
  cluster,cluster_note,Cluster Notes - ,cluster_note,,,field,character,,,,,
  profile,profile_name,Profile/Plot Name - ,profile_name,name for profile,field_id,field,factor,,,,,
  profile,profile_note,Profile Notes - ,profile_note,,,field,character,,,,,
  profile,profile_method,Profile Sampling Method - ,profile_method,,,field,character,,,,,
  profile,observation_date,Observation Date - YYYY-MM-DD or MM/DD/YYYY,observation_date,day the sample was taken,,field,character,,,,,
  