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data/schema/SCHEMA-SCHEMA

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+schema:   SCHEMA-SCHEMA
+ref:      dn42.schema
+key:      schema   required  single    schema   > [name] 
+key:      ref      required  single    primary  > [schema]
+key:      key      required  multiple  > [key-name] 
+                                         {required|optional|recommend|deprecate} 
+                                         {one|many} {single|multi} {primary|} {schema|} 
+                                         lookup=str '>' [spec]...
+key:      mnt-by   required  multiple    lookup=dn42.mntner > [mntner]
+key:      remarks  optional  multiple  > [text]...
+mnt-by:   XUU-MNT
+mnt-by:     HEXA-MNT
+remarks:  # option descriptions
+    required
+    :    object required to have at least one
+    optional
+    :    object not required to have at least one
+    
+    single  
+    :    only one of this type allowed
+    multiple
+    :    more than one of this type allowed
+        
+    primary
+    :    use field as lookup key for lookup
+          * only one allowed per schema
+          * does not allow newlines
+    
+    schema
+    :    use field name as the name of the schema
+          * only one allowed per schema
+          * does not allow newlines
+    
+    lookup
+    :    schema match to use for related record 
+    
+    \> option specs
+    :    defines the option specifications for the key.
+          * must come last in option list
+    
+         [label] string value. A positional string argument required. 
+         Text inside brackets represent a label for the string.
+         If follwed by '...' values are gathered as an array.
+    
+         {enum1|enum2|} enumeration. One option in pipe('|') deliniation is allowed. 
+         If there is a trailing pipe it means the enum is optional. 
+    
+         label=str keyword argument. Label for value with type 'str', 'int', or 'decimal' 
+    
+         'literal' Literal value. literal text value.