feat: add ocafile grammar rules for AttributeFraming Overlay

semantics/oca-file/src/ocafile.pest

@@ -132,6 +132,7 @@ oca_object = _{
     entry_code |
     entry |
     link |
+    attribute_framing |
     flagged_attrs
   )
 }
@@ -153,6 +154,7 @@ remove_oca_object = _{
     entry_code |
     entry |
     link |
+    attribute_framing |
     flagged_attrs
   )
 }
@@ -172,6 +174,21 @@ entry_code = {^"entry_code" ~ arg_ws ~ attrs_key ~ attr_entry_code_key_pairs}
 entry = {^"entry" ~ arg_ws ~ lang ~ arg_ws ~ attrs_key ~ attr_entry_key_pairs}
 unit = {^"unit" ~ arg_ws ~ attrs_key ~ unit_attr_key_pairs}
 link = {^"link" ~ arg_ws ~ reference_type ~ arg_ws ~ attrs_key ~ attr_key_pairs}
+attribute_framing = {^"attr_framing" ~ arg_ws ~ framing_metadata ~ arg_ws ~ attrs_key ~ attr_framing_key_pairs+}
+
+framing_metadata_key = ${ "id" | "label" | "location" | "version" }
+framing_metadata_value = ${ string | char+ }
+framing_metadata_pair = @{ framing_metadata_key ~ arg_ws? ~ "=" ~ arg_ws? ~ framing_metadata_value }
+framing_metadata = { framing_metadata_pair ~ (arg_ws ~ framing_metadata_pair)* }
+
+attr_framing_key_pair = @{ attr_key ~ arg_ws? ~ "=" ~ arg_ws? ~ json_object }
+attr_framing_key_pairs = ${ arg_ws* ~ attr_framing_key_pair ~ (arg_ws | NEWLINE)? }
+
+url = ${ string }
+json_key = ${ string }
+json_value = ${ string | url | json_object }
+json_pair = ${ json_key ~ arg_ws* ~ ":" ~ (arg_ws | NEWLINE)? ~ json_value ~ (arg_ws? ~ "," ~ (arg_ws | NEWLINE)?)? }
+json_object = ${ "{" ~ ((arg_ws | NEWLINE)? ~ arg_ws* ~ json_pair ~ (arg_ws | NEWLINE)?)+ ~ arg_ws* ~ "}" }
 
 flagged_attrs = {^"flagged_attributes" ~ arg_ws ~ list_value}
 classification = { ^"classification" ~ arg_ws ~ classification_value}