syntax = "proto2";

package google.protobuf;

option cc_enable_arenas = true;

option csharp_namespace = "Google.Protobuf.Reflection";

option go_package = "google.golang.org/protobuf/types/descriptorpb";

option java_outer_classname = "DescriptorProtos";

option java_package = "com.google.protobuf";

option objc_class_prefix = "GPB";

// descriptor.proto must be optimized for speed because reflection-based
// algorithms don't work during bootstrapping.
option optimize_for = SPEED;

// Describes a message type.
message DescriptorProto {
   optional string name = 1;

   repeated FieldDescriptorProto field = 2;

   repeated DescriptorProto nested_type = 3;

   repeated EnumDescriptorProto enum_type = 4;

   repeated ExtensionRange extension_range = 5;

   repeated FieldDescriptorProto extension = 6;

   optional MessageOptions options = 7;

   repeated OneofDescriptorProto oneof_decl = 8;

   repeated ReservedRange reserved_range = 9;

   // Reserved field names, which may not be used by fields in the same message.
   // A given name may only be reserved once.
   repeated string reserved_name = 10;

   message ExtensionRange {
      optional int32 start = 1; // Inclusive.

      optional int32 end = 2; // Exclusive.

      optional ExtensionRangeOptions options = 3;
   }

   // Range of reserved tag numbers. Reserved tag numbers may not be used by
   // fields or extension ranges in the same message. Reserved ranges may
   // not overlap.
   message ReservedRange {
      optional int32 start = 1; // Inclusive.

      optional int32 end = 2; // Exclusive.
   }
}

// Describes an enum type.
message EnumDescriptorProto {
   optional string name = 1;

   repeated EnumValueDescriptorProto value = 2;

   optional EnumOptions options = 3;

   // Range of reserved numeric values. Reserved numeric values may not be used
   // by enum values in the same enum declaration. Reserved ranges may not
   // overlap.
   repeated EnumReservedRange reserved_range = 4;

   // Reserved enum value names, which may not be reused. A given name may only
   // be reserved once.
   repeated string reserved_name = 5;

   // Range of reserved numeric values. Reserved values may not be used by
   // entries in the same enum. Reserved ranges may not overlap.
   //
   // Note that this is distinct from DescriptorProto.ReservedRange in that it
   // is inclusive such that it can appropriately represent the entire int32
   // domain.
   message EnumReservedRange {
      optional int32 start = 1; // Inclusive.

      optional int32 end = 2; // Inclusive.
   }
}

message EnumOptions {
   // Set this option to true to allow mapping different tag names to the same
   // value.
   optional bool allow_alias = 2;

   // Is this enum deprecated?
   // Depending on the target platform, this can emit Deprecated annotations
   // for the enum, or it will be completely ignored; in the very least, this
   // is a formalization for deprecating enums.
   optional bool deprecated = 3 [default = false];

   // The parser stores options it doesn't recognize here. See above.
   repeated UninterpretedOption uninterpreted_option = 999;

   extensions 1000 to max;

   reserved 5;
}

// Describes a value within an enum.
message EnumValueDescriptorProto {
   optional string name = 1;

   optional int32 number = 2;

   optional EnumValueOptions options = 3;
}

message EnumValueOptions {
   // Is this enum value deprecated?
   // Depending on the target platform, this can emit Deprecated annotations
   // for the enum value, or it will be completely ignored; in the very least,
   // this is a formalization for deprecating enum values.
   optional bool deprecated = 1 [default = false];

   // The parser stores options it doesn't recognize here. See above.
   repeated UninterpretedOption uninterpreted_option = 999;

   extensions 1000 to max;
}

message ExtensionRangeOptions {
   // The parser stores options it doesn't recognize here. See above.
   repeated UninterpretedOption uninterpreted_option = 999;

   extensions 1000 to max;
}

// Describes a field within a message.
message FieldDescriptorProto {
   optional string name = 1;

   // For extensions, this is the name of the type being extended.  It is
   // resolved in the same manner as type_name.
   optional string extendee = 2;

   optional int32 number = 3;

   optional Label label = 4;

   // If type_name is set, this need not be set.  If both this and type_name
   // are set, this must be one of TYPE_ENUM, TYPE_MESSAGE or TYPE_GROUP.
   optional Type type = 5;

   // For message and enum types, this is the name of the type.  If the name
   // starts with a '.', it is fully-qualified.  Otherwise, C++-like scoping
   // rules are used to find the type (i.e. first the nested types within this
   // message are searched, then within the parent, on up to the root
   // namespace).
   optional string type_name = 6;

   // For numeric types, contains the original text representation of the value.
   // For booleans, "true" or "false".
   // For strings, contains the default text contents (not escaped in any way).
   // For bytes, contains the C escaped value.  All bytes >= 128 are escaped.
   optional string default_value = 7;

   optional FieldOptions options = 8;

   // If set, gives the index of a oneof in the containing type's oneof_decl
   // list.  This field is a member of that oneof.
   optional int32 oneof_index = 9;

   // JSON name of this field. The value is set by protocol compiler. If the
   // user has set a "json_name" option on this field, that option's value
   // will be used. Otherwise, it's deduced from the field's name by converting
   // it to camelCase.
   optional string json_name = 10;

   // If true, this is a proto3 "optional". When a proto3 field is optional, it
   // tracks presence regardless of field type.
   //
   // When proto3_optional is true, this field must be belong to a oneof to
   // signal to old proto3 clients that presence is tracked for this field. This
   // oneof is known as a "synthetic" oneof, and this field must be its sole
   // member (each proto3 optional field gets its own synthetic oneof). Synthetic
   // oneofs exist in the descriptor only, and do not generate any API. Synthetic
   // oneofs must be ordered after all "real" oneofs.
   //
   // For message fields, proto3_optional doesn't create any semantic change,
   // since non-repeated message fields always track presence. However it still
   // indicates the semantic detail of whether the user wrote "optional" or not.
   // This can be useful for round-tripping the .proto file. For consistency we
   // give message fields a synthetic oneof also, even though it is not required
   // to track presence. This is especially important because the parser can't
   // tell if a field is a message or an enum, so it must always create a
   // synthetic oneof.
   //
   // Proto2 optional fields do not set this flag, because they already indicate
   // optional with `LABEL_OPTIONAL`.
   optional bool proto3_optional = 17;

   enum Label {
      // 0 is reserved for errors
      LABEL_OPTIONAL = 1;

      LABEL_REQUIRED = 2;

      LABEL_REPEATED = 3;
   }

   enum Type {
      // 0 is reserved for errors.
      // Order is weird for historical reasons.
      TYPE_DOUBLE = 1;

      TYPE_FLOAT = 2;

      // Not ZigZag encoded.  Negative numbers take 10 bytes.  Use TYPE_SINT64 if
      // negative values are likely.
      TYPE_INT64 = 3;

      TYPE_UINT64 = 4;

      // Not ZigZag encoded.  Negative numbers take 10 bytes.  Use TYPE_SINT32 if
      // negative values are likely.
      TYPE_INT32 = 5;

      TYPE_FIXED64 = 6;

      TYPE_FIXED32 = 7;

      TYPE_BOOL = 8;

      TYPE_STRING = 9;

      // Tag-delimited aggregate.
      // Group type is deprecated and not supported in proto3. However, Proto3
      // implementations should still be able to parse the group wire format and
      // treat group fields as unknown fields.
      TYPE_GROUP = 10;

      TYPE_MESSAGE = 11; // Length-delimited aggregate.

      // New in version 2.
      TYPE_BYTES = 12;

      TYPE_UINT32 = 13;

      TYPE_ENUM = 14;

      TYPE_SFIXED32 = 15;

      TYPE_SFIXED64 = 16;

      TYPE_SINT32 = 17; // Uses ZigZag encoding.

      TYPE_SINT64 = 18; // Uses ZigZag encoding.
   }
}

message FieldOptions {
   // The ctype option instructs the C++ code generator to use a different
   // representation of the field than it normally would.  See the specific
   // options below.  This option is not yet implemented in the open source
   // release -- sorry, we'll try to include it in a future version!
   optional CType ctype = 1 [default = STRING];

   // The packed option can be enabled for repeated primitive fields to enable
   // a more efficient representation on the wire. Rather than repeatedly
   // writing the tag and type for each element, the entire array is encoded as
   // a single length-delimited blob. In proto3, only explicit setting it to
   // false will avoid using packed encoding.
   optional bool packed = 2;

   // Is this field deprecated?
   // Depending on the target platform, this can emit Deprecated annotations
   // for accessors, or it will be completely ignored; in the very least, this
   // is a formalization for deprecating fields.
   optional bool deprecated = 3 [default = false];

   // Should this field be parsed lazily?  Lazy applies only to message-type
   // fields.  It means that when the outer message is initially parsed, the
   // inner message's contents will not be parsed but instead stored in encoded
   // form.  The inner message will actually be parsed when it is first accessed.
   //
   // This is only a hint.  Implementations are free to choose whether to use
   // eager or lazy parsing regardless of the value of this option.  However,
   // setting this option true suggests that the protocol author believes that
   // using lazy parsing on this field is worth the additional bookkeeping
   // overhead typically needed to implement it.
   //
   // This option does not affect the public interface of any generated code;
   // all method signatures remain the same.  Furthermore, thread-safety of the
   // interface is not affected by this option; const methods remain safe to
   // call from multiple threads concurrently, while non-const methods continue
   // to require exclusive access.
   //
   //
   // Note that implementations may choose not to check required fields within
   // a lazy sub-message.  That is, calling IsInitialized() on the outer message
   // may return true even if the inner message has missing required fields.
   // This is necessary because otherwise the inner message would have to be
   // parsed in order to perform the check, defeating the purpose of lazy
   // parsing.  An implementation which chooses not to check required fields
   // must be consistent about it.  That is, for any particular sub-message, the
   // implementation must either *always* check its required fields, or *never*
   // check its required fields, regardless of whether or not the message has
   // been parsed.
   //
   // As of 2021, lazy does no correctness checks on the byte stream during
   // parsing.  This may lead to crashes if and when an invalid byte stream is
   // finally parsed upon access.
   //
   // TODO(b/211906113):  Enable validation on lazy fields.
   optional bool lazy = 5 [default = false];

   // The jstype option determines the JavaScript type used for values of the
   // field.  The option is permitted only for 64 bit integral and fixed types
   // (int64, uint64, sint64, fixed64, sfixed64).  A field with jstype JS_STRING
   // is represented as JavaScript string, which avoids loss of precision that
   // can happen when a large value is converted to a floating point JavaScript.
   // Specifying JS_NUMBER for the jstype causes the generated JavaScript code to
   // use the JavaScript "number" type.  The behavior of the default option
   // JS_NORMAL is implementation dependent.
   //
   // This option is an enum to permit additional types to be added, e.g.
   // goog.math.Integer.
   optional JSType jstype = 6 [default = JS_NORMAL];

   // For Google-internal migration only. Do not use.
   optional bool weak = 10 [default = false];

   // unverified_lazy does no correctness checks on the byte stream. This should
   // only be used where lazy with verification is prohibitive for performance
   // reasons.
   optional bool unverified_lazy = 15 [default = false];

   // The parser stores options it doesn't recognize here. See above.
   repeated UninterpretedOption uninterpreted_option = 999;

   enum CType {
      // Default mode.
      STRING = 0;

      CORD = 1;

      STRING_PIECE = 2;
   }

   enum JSType {
      // Use the default type.
      JS_NORMAL = 0;

      // Use JavaScript strings.
      JS_STRING = 1;

      // Use JavaScript numbers.
      JS_NUMBER = 2;
   }

   extensions 1000 to max;

   reserved 4;
}

// Describes a complete .proto file.
message FileDescriptorProto {
   optional string name = 1; // file name, relative to root of source tree

   optional string package = 2; // e.g. "foo", "foo.bar", etc.

   // Names of files imported by this file.
   repeated string dependency = 3;

   // All top-level definitions in this file.
   repeated DescriptorProto message_type = 4;

   repeated EnumDescriptorProto enum_type = 5;

   repeated ServiceDescriptorProto service = 6;

   repeated FieldDescriptorProto extension = 7;

   optional FileOptions options = 8;

   // This field contains optional information about the original source code.
   // You may safely remove this entire field without harming runtime
   // functionality of the descriptors -- the information is needed only by
   // development tools.
   optional SourceCodeInfo source_code_info = 9;

   // Indexes of the public imported files in the dependency list above.
   repeated int32 public_dependency = 10;

   // Indexes of the weak imported files in the dependency list.
   // For Google-internal migration only. Do not use.
   repeated int32 weak_dependency = 11;

   // The syntax of the proto file.
   // The supported values are "proto2" and "proto3".
   optional string syntax = 12;
}

// The protocol compiler can output a FileDescriptorSet containing the .proto
// files it parses.
message FileDescriptorSet {
   repeated FileDescriptorProto file = 1;
}

message FileOptions {
   // Sets the Java package where classes generated from this .proto will be
   // placed.  By default, the proto package is used, but this is often
   // inappropriate because proto packages do not normally start with backwards
   // domain names.
   optional string java_package = 1;

   // Controls the name of the wrapper Java class generated for the .proto file.
   // That class will always contain the .proto file's getDescriptor() method as
   // well as any top-level extensions defined in the .proto file.
   // If java_multiple_files is disabled, then all the other classes from the
   // .proto file will be nested inside the single wrapper outer class.
   optional string java_outer_classname = 8;

   optional OptimizeMode optimize_for = 9 [default = SPEED];

   // If enabled, then the Java code generator will generate a separate .java
   // file for each top-level message, enum, and service defined in the .proto
   // file.  Thus, these types will *not* be nested inside the wrapper class
   // named by java_outer_classname.  However, the wrapper class will still be
   // generated to contain the file's getDescriptor() method as well as any
   // top-level extensions defined in the file.
   optional bool java_multiple_files = 10 [default = false];

   // Sets the Go package where structs generated from this .proto will be
   // placed. If omitted, the Go package will be derived from the following:
   //   - The basename of the package import path, if provided.
   //   - Otherwise, the package statement in the .proto file, if present.
   //   - Otherwise, the basename of the .proto file, without extension.
   optional string go_package = 11;

   // Should generic services be generated in each language?  "Generic" services
   // are not specific to any particular RPC system.  They are generated by the
   // main code generators in each language (without additional plugins).
   // Generic services were the only kind of service generation supported by
   // early versions of google.protobuf.
   //
   // Generic services are now considered deprecated in favor of using plugins
   // that generate code specific to your particular RPC system.  Therefore,
   // these default to false.  Old code which depends on generic services should
   // explicitly set them to true.
   optional bool cc_generic_services = 16 [default = false];

   optional bool java_generic_services = 17 [default = false];

   optional bool py_generic_services = 18 [default = false];

   // This option does nothing.
   optional bool java_generate_equals_and_hash = 20 [deprecated = true];

   // Is this file deprecated?
   // Depending on the target platform, this can emit Deprecated annotations
   // for everything in the file, or it will be completely ignored; in the very
   // least, this is a formalization for deprecating files.
   optional bool deprecated = 23 [default = false];

   // If set true, then the Java2 code generator will generate code that
   // throws an exception whenever an attempt is made to assign a non-UTF-8
   // byte sequence to a string field.
   // Message reflection will do the same.
   // However, an extension field still accepts non-UTF-8 byte sequences.
   // This option has no effect on when used with the lite runtime.
   optional bool java_string_check_utf8 = 27 [default = false];

   // Enables the use of arenas for the proto messages in this file. This applies
   // only to generated classes for C++.
   optional bool cc_enable_arenas = 31 [default = true];

   // Sets the objective c class prefix which is prepended to all objective c
   // generated classes from this .proto. There is no default.
   optional string objc_class_prefix = 36;

   // Namespace for generated classes; defaults to the package.
   optional string csharp_namespace = 37;

   // By default Swift generators will take the proto package and CamelCase it
   // replacing '.' with underscore and use that to prefix the types/symbols
   // defined. When this options is provided, they will use this value instead
   // to prefix the types/symbols defined.
   optional string swift_prefix = 39;

   // Sets the php class prefix which is prepended to all php generated classes
   // from this .proto. Default is empty.
   optional string php_class_prefix = 40;

   // Use this option to change the namespace of php generated classes. Default
   // is empty. When this option is empty, the package name will be used for
   // determining the namespace.
   optional string php_namespace = 41;

   optional bool php_generic_services = 42 [default = false];

   // Use this option to change the namespace of php generated metadata classes.
   // Default is empty. When this option is empty, the proto file name will be
   // used for determining the namespace.
   optional string php_metadata_namespace = 44;

   // Use this option to change the package of ruby generated classes. Default
   // is empty. When this option is not set, the package name will be used for
   // determining the ruby package.
   optional string ruby_package = 45;

   // The parser stores options it doesn't recognize here.
   // See the documentation for the "Options" section above.
   repeated UninterpretedOption uninterpreted_option = 999;

   // Generated classes can be optimized for speed or code size.
   enum OptimizeMode {
      SPEED = 1; // Generate complete code for parsing, serialization,

      // etc.
      CODE_SIZE = 2; // Use ReflectionOps to implement these methods.

      LITE_RUNTIME = 3; // Generate code using MessageLite and the lite runtime.
   }

   extensions 1000 to max;

   reserved 38;
}

// Describes the relationship between generated code and its original source
// file. A GeneratedCodeInfo message is associated with only one generated
// source file, but may contain references to different source .proto files.
message GeneratedCodeInfo {
   // An Annotation connects some span of text in generated code to an element
   // of its generating .proto file.
   repeated Annotation annotation = 1;

   message Annotation {
      // Identifies the element in the original source .proto file. This field
      // is formatted the same as SourceCodeInfo.Location.path.
      repeated int32 path = 1 [packed = true];

      // Identifies the filesystem path to the original source .proto.
      optional string source_file = 2;

      // Identifies the starting offset in bytes in the generated code
      // that relates to the identified object.
      optional int32 begin = 3;

      // Identifies the ending offset in bytes in the generated code that
      // relates to the identified offset. The end offset should be one past
      // the last relevant byte (so the length of the text = end - begin).
      optional int32 end = 4;
   }
}

message MessageOptions {
   // Set true to use the old proto1 MessageSet wire format for extensions.
   // This is provided for backwards-compatibility with the MessageSet wire
   // format.  You should not use this for any other reason:  It's less
   // efficient, has fewer features, and is more complicated.
   //
   // The message must be defined exactly as follows:
   //   message Foo {
   //     option message_set_wire_format = true;
   //     extensions 4 to max;
   //   }
   // Note that the message cannot have any defined fields; MessageSets only
   // have extensions.
   //
   // All extensions of your type must be singular messages; e.g. they cannot
   // be int32s, enums, or repeated messages.
   //
   // Because this is an option, the above two restrictions are not enforced by
   // the protocol compiler.
   optional bool message_set_wire_format = 1 [default = false];

   // Disables the generation of the standard "descriptor()" accessor, which can
   // conflict with a field of the same name.  This is meant to make migration
   // from proto1 easier; new code should avoid fields named "descriptor".
   optional bool no_standard_descriptor_accessor = 2 [default = false];

   // Is this message deprecated?
   // Depending on the target platform, this can emit Deprecated annotations
   // for the message, or it will be completely ignored; in the very least,
   // this is a formalization for deprecating messages.
   optional bool deprecated = 3 [default = false];

   // Whether the message is an automatically generated map entry type for the
   // maps field.
   //
   // For maps fields:
   //     map<KeyType, ValueType> map_field = 1;
   // The parsed descriptor looks like:
   //     message MapFieldEntry {
   //         option map_entry = true;
   //         optional KeyType key = 1;
   //         optional ValueType value = 2;
   //     }
   //     repeated MapFieldEntry map_field = 1;
   //
   // Implementations may choose not to generate the map_entry=true message, but
   // use a native map in the target language to hold the keys and values.
   // The reflection APIs in such implementations still need to work as
   // if the field is a repeated message field.
   //
   // NOTE: Do not set the option in .proto files. Always use the maps syntax
   // instead. The option should only be implicitly set by the proto compiler
   // parser.
   optional bool map_entry = 7;

   // The parser stores options it doesn't recognize here. See above.
   repeated UninterpretedOption uninterpreted_option = 999;

   extensions 1000 to max;

   reserved 4, 5, 6, 8, 9;
}

// Describes a method of a service.
message MethodDescriptorProto {
   optional string name = 1;

   // Input and output type names.  These are resolved in the same way as
   // FieldDescriptorProto.type_name, but must refer to a message type.
   optional string input_type = 2;

   optional string output_type = 3;

   optional MethodOptions options = 4;

   // Identifies if client streams multiple client messages
   optional bool client_streaming = 5 [default = false];

   // Identifies if server streams multiple server messages
   optional bool server_streaming = 6 [default = false];
}

message MethodOptions {
   // Is this method deprecated?
   // Depending on the target platform, this can emit Deprecated annotations
   // for the method, or it will be completely ignored; in the very least,
   // this is a formalization for deprecating methods.
   optional bool deprecated = 33 [default = false];

   optional IdempotencyLevel idempotency_level = 34 [default = IDEMPOTENCY_UNKNOWN];

   // The parser stores options it doesn't recognize here. See above.
   repeated UninterpretedOption uninterpreted_option = 999;

   // Is this method side-effect-free (or safe in HTTP parlance), or idempotent,
   // or neither? HTTP based RPC implementation may choose GET verb for safe
   // methods, and PUT verb for idempotent methods instead of the default POST.
   enum IdempotencyLevel {
      IDEMPOTENCY_UNKNOWN = 0;

      NO_SIDE_EFFECTS = 1; // implies idempotent

      IDEMPOTENT = 2; // idempotent, but may have side effects
   }

   extensions 1000 to max;
}

// Describes a oneof.
message OneofDescriptorProto {
   optional string name = 1;

   optional OneofOptions options = 2;
}

message OneofOptions {
   // The parser stores options it doesn't recognize here. See above.
   repeated UninterpretedOption uninterpreted_option = 999;

   extensions 1000 to max;
}

// Describes a service.
message ServiceDescriptorProto {
   optional string name = 1;

   repeated MethodDescriptorProto method = 2;

   optional ServiceOptions options = 3;
}

message ServiceOptions {
   // Is this service deprecated?
   // Depending on the target platform, this can emit Deprecated annotations
   // for the service, or it will be completely ignored; in the very least,
   // this is a formalization for deprecating services.
   optional bool deprecated = 33 [default = false];

   // The parser stores options it doesn't recognize here. See above.
   repeated UninterpretedOption uninterpreted_option = 999;

   extensions 1000 to max;
}

// Encapsulates information about the original source file from which a
// FileDescriptorProto was generated.
message SourceCodeInfo {
   // A Location identifies a piece of source code in a .proto file which
   // corresponds to a particular definition.  This information is intended
   // to be useful to IDEs, code indexers, documentation generators, and similar
   // tools.
   //
   // For example, say we have a file like:
   //   message Foo {
   //     optional string foo = 1;
   //   }
   // Let's look at just the field definition:
   //   optional string foo = 1;
   //   ^       ^^     ^^  ^  ^^^
   //   a       bc     de  f  ghi
   // We have the following locations:
   //   span   path               represents
   //   [a,i)  [ 4, 0, 2, 0 ]     The whole field definition.
   //   [a,b)  [ 4, 0, 2, 0, 4 ]  The label (optional).
   //   [c,d)  [ 4, 0, 2, 0, 5 ]  The type (string).
   //   [e,f)  [ 4, 0, 2, 0, 1 ]  The name (foo).
   //   [g,h)  [ 4, 0, 2, 0, 3 ]  The number (1).
   //
   // Notes:
   // - A location may refer to a repeated field itself (i.e. not to any
   //   particular index within it).  This is used whenever a set of elements are
   //   logically enclosed in a single code segment.  For example, an entire
   //   extend block (possibly containing multiple extension definitions) will
   //   have an outer location whose path refers to the "extensions" repeated
   //   field without an index.
   // - Multiple locations may have the same path.  This happens when a single
   //   logical declaration is spread out across multiple places.  The most
   //   obvious example is the "extend" block again -- there may be multiple
   //   extend blocks in the same scope, each of which will have the same path.
   // - A location's span is not always a subset of its parent's span.  For
   //   example, the "extendee" of an extension declaration appears at the
   //   beginning of the "extend" block and is shared by all extensions within
   //   the block.
   // - Just because a location's span is a subset of some other location's span
   //   does not mean that it is a descendant.  For example, a "group" defines
   //   both a type and a field in a single declaration.  Thus, the locations
   //   corresponding to the type and field and their components will overlap.
   // - Code which tries to interpret locations should probably be designed to
   //   ignore those that it doesn't understand, as more types of locations could
   //   be recorded in the future.
   repeated Location location = 1;

   message Location {
      // Identifies which part of the FileDescriptorProto was defined at this
      // location.
      //
      // Each element is a field number or an index.  They form a path from
      // the root FileDescriptorProto to the place where the definition occurs.
      // For example, this path:
      //   [ 4, 3, 2, 7, 1 ]
      // refers to:
      //   file.message_type(3)  // 4, 3
      //       .field(7)         // 2, 7
      //       .name()           // 1
      // This is because FileDescriptorProto.message_type has field number 4:
      //   repeated DescriptorProto message_type = 4;
      // and DescriptorProto.field has field number 2:
      //   repeated FieldDescriptorProto field = 2;
      // and FieldDescriptorProto.name has field number 1:
      //   optional string name = 1;
      //
      // Thus, the above path gives the location of a field name.  If we removed
      // the last element:
      //   [ 4, 3, 2, 7 ]
      // this path refers to the whole field declaration (from the beginning
      // of the label to the terminating semicolon).
      repeated int32 path = 1 [packed = true];

      // Always has exactly three or four elements: start line, start column,
      // end line (optional, otherwise assumed same as start line), end column.
      // These are packed into a single field for efficiency.  Note that line
      // and column numbers are zero-based -- typically you will want to add
      // 1 to each before displaying to a user.
      repeated int32 span = 2 [packed = true];

      // If this SourceCodeInfo represents a complete declaration, these are any
      // comments appearing before and after the declaration which appear to be
      // attached to the declaration.
      //
      // A series of line comments appearing on consecutive lines, with no other
      // tokens appearing on those lines, will be treated as a single comment.
      //
      // leading_detached_comments will keep paragraphs of comments that appear
      // before (but not connected to) the current element. Each paragraph,
      // separated by empty lines, will be one comment element in the repeated
      // field.
      //
      // Only the comment content is provided; comment markers (e.g. //) are
      // stripped out.  For block comments, leading whitespace and an asterisk
      // will be stripped from the beginning of each line other than the first.
      // Newlines are included in the output.
      //
      // Examples:
      //
      //   optional int32 foo = 1;  // Comment attached to foo.
      //   // Comment attached to bar.
      //   optional int32 bar = 2;
      //
      //   optional string baz = 3;
      //   // Comment attached to baz.
      //   // Another line attached to baz.
      //
      //   // Comment attached to moo.
      //   //
      //   // Another line attached to moo.
      //   optional double moo = 4;
      //
      //   // Detached comment for corge. This is not leading or trailing comments
      //   // to moo or corge because there are blank lines separating it from
      //   // both.
      //
      //   // Detached comment for corge paragraph 2.
      //
      //   optional string corge = 5;
      //   /* Block comment attached
      //    * to corge.  Leading asterisks
      //    * will be removed. */
      //   /* Block comment attached to
      //    * grault. */
      //   optional int32 grault = 6;
      //
      //   // ignored detached comments.
      optional string leading_comments = 3;

      optional string trailing_comments = 4;

      repeated string leading_detached_comments = 6;
   }
}

// A message representing a option the parser does not recognize. This only
// appears in options protos created by the compiler::Parser class.
// DescriptorPool resolves these when building Descriptor objects. Therefore,
// options protos in descriptor objects (e.g. returned by Descriptor::options(),
// or produced by Descriptor::CopyTo()) will never have UninterpretedOptions
// in them.
message UninterpretedOption {
   repeated NamePart name = 2;

   // The value of the uninterpreted option, in whatever type the tokenizer
   // identified it as during parsing. Exactly one of these should be set.
   optional string identifier_value = 3;

   optional uint64 positive_int_value = 4;

   optional int64 negative_int_value = 5;

   optional double double_value = 6;

   optional bytes string_value = 7;

   optional string aggregate_value = 8;

   // The name of the uninterpreted option.  Each string represents a segment in
   // a dot-separated name.  is_extension is true iff a segment represents an
   // extension (denoted with parentheses in options specs in .proto files).
   // E.g.,{ ["foo", false], ["bar.baz", true], ["moo", false] } represents
   // "foo.(bar.baz).moo".
   message NamePart {
      required string name_part = 1;

      required bool is_extension = 2;
   }
}
