github.com/jhump/protoreflect@v1.16.0/desc/protoprint/testfiles/descriptor-multiline-style-comments.proto

/*
 * Protocol Buffers - Google's data interchange format
 * Copyright 2008 Google Inc.  All rights reserved.
 * https://developers.google.com/protocol-buffers/
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * Author: kenton@google.com (Kenton Varda)
 *  Based on original Protocol Buffers design by
 *  Sanjay Ghemawat, Jeff Dean, and others.
 *
 * The messages in this file describe the definitions found in .proto files.
 * A valid .proto file can be translated directly to a FileDescriptorProto
 * without any other information (e.g. without reading its imports).
 */

syntax = "proto2";

package google.protobuf;

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

option java_package = "com.google.protobuf";

option java_outer_classname = "DescriptorProtos";

option csharp_namespace = "Google.Protobuf.Reflection";

option objc_class_prefix = "GPB";

option cc_enable_arenas = true;

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

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

/* The full set of known editions. */
enum Edition {
	/* A placeholder for an unknown edition value. */
	EDITION_UNKNOWN = 0;

	/*
	 * Legacy syntax "editions".  These pre-date editions, but behave much like
	 * distinct editions.  These can't be used to specify the edition of proto
	 * files, but feature definitions must supply proto2/proto3 defaults for
	 * backwards compatibility.
	 */
	EDITION_PROTO2 = 998;

	EDITION_PROTO3 = 999;

	/*
	 * Editions that have been released.  The specific values are arbitrary and
	 * should not be depended on, but they will always be time-ordered for easy
	 * comparison.
	 */
	EDITION_2023 = 1000;

	EDITION_2024 = 1001;

	/*
	 * Placeholder editions for testing feature resolution.  These should not be
	 * used or relyed on outside of tests.
	 */
	EDITION_1_TEST_ONLY = 1;

	EDITION_2_TEST_ONLY = 2;

	EDITION_99997_TEST_ONLY = 99997;

	EDITION_99998_TEST_ONLY = 99998;

	EDITION_99999_TEST_ONLY = 99999;

	/*
	 * Placeholder for specifying unbounded edition support.  This should only
	 * ever be used by plugins that can expect to never require any changes to
	 * support a new edition.
	 */
	EDITION_MAX = 2147483647;
}

/* 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;

	/* 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;

	/* 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;

	/*
	 * The syntax of the proto file.
	 * The supported values are "proto2", "proto3", and "editions".
	 *
	 * If `edition` is present, this value must be "editions".
	 */
	optional string syntax = 12;

	/* The edition of the proto file. */
	optional Edition edition = 14;
}

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

	repeated FieldDescriptorProto field = 2;

	repeated FieldDescriptorProto extension = 6;

	repeated DescriptorProto nested_type = 3;

	repeated EnumDescriptorProto enum_type = 4;

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

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

		optional ExtensionRangeOptions options = 3;
	}

	repeated ExtensionRange extension_range = 5;

	repeated OneofDescriptorProto oneof_decl = 8;

	optional MessageOptions options = 7;

	/*
	 * 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. */
	}

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

	message Declaration {
		/* The extension number declared within the extension range. */
		optional int32 number = 1;

		/*
		 * The fully-qualified name of the extension field. There must be a leading
		 * dot in front of the full name.
		 */
		optional string full_name = 2;

		/*
		 * The fully-qualified type name of the extension field. Unlike
		 * Metadata.type, Declaration.type must have a leading dot for messages
		 * and enums.
		 */
		optional string type = 3;

		/*
		 * If true, indicates that the number is reserved in the extension range,
		 * and any extension field with the number will fail to compile. Set this
		 * when a declared extension field is deleted.
		 */
		optional bool reserved = 5;

		/*
		 * If true, indicates that the extension must be defined as repeated.
		 * Otherwise the extension must be defined as optional.
		 */
		optional bool repeated = 6;

		reserved 4;
	}

	/*
	 * For external users: DO NOT USE. We are in the process of open sourcing
	 * extension declaration and executing internal cleanups before it can be
	 * used externally.
	 */
	repeated Declaration declaration = 2 [retention = RETENTION_SOURCE];

	/* Any features defined in the specific edition. */
	optional FeatureSet features = 50;

	/* The verification state of the extension range. */
	enum VerificationState {
		/* All the extensions of the range must be declared. */
		DECLARATION = 0;

		UNVERIFIED = 1;
	}

	/*
	 * The verification state of the range.
	 * TODO: flip the default to DECLARATION once all empty ranges
	 * are marked as UNVERIFIED.
	 */
	optional VerificationState verification = 3 [default = UNVERIFIED, retention = RETENTION_SOURCE];

	extensions 1000 to max;
}

/* Describes a field within a message. */
message FieldDescriptorProto {
	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 after google.protobuf. However, Proto3
		 * implementations should still be able to parse the group wire format and
		 * treat group fields as unknown fields.  In Editions, the group wire format
		 * can be enabled via the `message_encoding` feature.
		 */
		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. */
	}

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

		LABEL_REPEATED = 3;

		/*
		 * The required label is only allowed in google.protobuf.  In proto3 and Editions
		 * it's explicitly prohibited.  In Editions, the `field_presence` feature
		 * can be used to get this behavior.
		 */
		LABEL_REQUIRED = 2;
	}

	optional string name = 1;

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

	/*
	 * 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;

	/*
	 * 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;

	optional FieldOptions options = 8;

	/*
	 * 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 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;
}

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

	optional OneofOptions options = 2;
}

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

	repeated EnumValueDescriptorProto value = 2;

	optional EnumOptions options = 3;

	/*
	 * 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. */
	}

	/*
	 * 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;
}

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

	optional int32 number = 2;

	optional EnumValueOptions options = 3;
}

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

	repeated MethodDescriptorProto method = 2;

	optional ServiceOptions options = 3;
}

/* 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];
}

/*
 * ===================================================================
 * Options
 */

/*
 * Each of the definitions above may have "options" attached.  These are
 * just annotations which may cause code to be generated slightly differently
 * or may contain hints for code that manipulates protocol messages.
 *
 * Clients may define custom options as extensions of the *Options messages.
 * These extensions may not yet be known at parsing time, so the parser cannot
 * store the values in them.  Instead it stores them in a field in the *Options
 * message called uninterpreted_option. This field must have the same name
 * across all *Options messages. We then use this field to populate the
 * extensions when we build a descriptor, at which point all protos have been
 * parsed and so all extensions are known.
 *
 * Extension numbers for custom options may be chosen as follows:
 * * For options which will only be used within a single application or
 *   organization, or for experimental options, use field numbers 50000
 *   through 99999.  It is up to you to ensure that you do not use the
 *   same number for multiple options.
 * * For options which will be published and used publicly by multiple
 *   independent entities, e-mail protobuf-global-extension-registry@google.com
 *   to reserve extension numbers. Simply provide your project name (e.g.
 *   Objective-C plugin) and your project website (if available) -- there's no
 *   need to explain how you intend to use them. Usually you only need one
 *   extension number. You can declare multiple options with only one extension
 *   number by putting them in a sub-message. See the Custom Options section of
 *   the docs for examples:
 *   https://developers.google.com/protocol-buffers/docs/proto#options
 *   If this turns out to be popular, a web service will be set up
 *   to automatically assign option numbers.
 */

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;

	/*
	 * 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];

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

	/*
	 * 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];

	/* 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. */
	}

	optional OptimizeMode optimize_for = 9 [default = SPEED];

	/*
	 * 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];

	reserved 42;

	/*
	 * 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];

	/*
	 * 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;

	/*
	 * 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;

	/* Any features defined in the specific edition. */
	optional FeatureSet features = 50;

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

	extensions 1000 to max;

	reserved 38;
}

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];

	reserved 4, 5, 6;

	/*
	 * 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;

	reserved 8, 9;

	/*
	 * Enable the legacy handling of JSON field name conflicts.  This lowercases
	 * and strips underscored from the fields before comparison in proto3 only.
	 * The new behavior takes `json_name` into account and applies to proto2 as
	 * well.
	 *
	 * This should only be used as a temporary measure against broken builds due
	 * to the change in behavior for JSON field name conflicts.
	 *
	 * TODO This is legacy behavior we plan to remove once downstream
	 * teams have had time to migrate.
	 */
	optional bool deprecated_legacy_json_field_conflicts = 11 [deprecated = true];

	/* Any features defined in the specific edition. */
	optional FeatureSet features = 12;

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

	extensions 1000 to max;
}

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 only implemented to support use of
	 * [ctype=CORD] and [ctype=STRING] (the default) on non-repeated fields of
	 * type "bytes" in the open source release -- sorry, we'll try to include
	 * other types in a future version!
	 */
	optional CType ctype = 1 [default = STRING];

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

		/*
		 * The option [ctype=CORD] may be applied to a non-repeated field of type
		 * "bytes". It indicates that in C++, the data should be stored in a Cord
		 * instead of a string.  For very large strings, this may reduce memory
		 * fragmentation. It may also allow better performance when parsing from a
		 * Cord, or when parsing with aliasing enabled, as the parsed Cord may then
		 * alias the original buffer.
		 */
		CORD = 1;

		STRING_PIECE = 2;
	}

	/*
	 * 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.  This option is prohibited in
	 * Editions, but the `repeated_field_encoding` feature can be used to control
	 * the behavior.
	 */
	optional bool packed = 2;

	/*
	 * 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];

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

		/* Use JavaScript strings. */
		JS_STRING = 1;

		/* Use JavaScript numbers. */
		JS_NUMBER = 2;
	}

	/*
	 * 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 lazy message fields are still eagerly verified to check
	 * ill-formed wireformat or missing required fields. Calling IsInitialized()
	 * on the outer message would fail if the inner message has missing required
	 * fields. Failed verification would result in parsing failure (except when
	 * uninitialized messages are acceptable).
	 */
	optional bool lazy = 5 [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];

	/*
	 * 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];

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

	/*
	 * Indicate that the field value should not be printed out when using debug
	 * formats, e.g. when the field contains sensitive credentials.
	 */
	optional bool debug_redact = 16 [default = false];

	/*
	 * If set to RETENTION_SOURCE, the option will be omitted from the binary.
	 * Note: as of January 2023, support for this is in progress and does not yet
	 * have an effect (b/264593489).
	 */
	enum OptionRetention {
		RETENTION_UNKNOWN = 0;

		RETENTION_RUNTIME = 1;

		RETENTION_SOURCE = 2;
	}

	optional OptionRetention retention = 17;

	/*
	 * This indicates the types of entities that the field may apply to when used
	 * as an option. If it is unset, then the field may be freely used as an
	 * option on any kind of entity. Note: as of January 2023, support for this is
	 * in progress and does not yet have an effect (b/264593489).
	 */
	enum OptionTargetType {
		TARGET_TYPE_UNKNOWN = 0;

		TARGET_TYPE_FILE = 1;

		TARGET_TYPE_EXTENSION_RANGE = 2;

		TARGET_TYPE_MESSAGE = 3;

		TARGET_TYPE_FIELD = 4;

		TARGET_TYPE_ONEOF = 5;

		TARGET_TYPE_ENUM = 6;

		TARGET_TYPE_ENUM_ENTRY = 7;

		TARGET_TYPE_SERVICE = 8;

		TARGET_TYPE_METHOD = 9;
	}

	repeated OptionTargetType targets = 19;

	message EditionDefault {
		optional Edition edition = 3;

		optional string value = 2; /* Textproto value. */
	}

	repeated EditionDefault edition_defaults = 20;

	/* Any features defined in the specific edition. */
	optional FeatureSet features = 21;

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

	extensions 1000 to max;

	reserved 4, 18;
}

message OneofOptions {
	/* Any features defined in the specific edition. */
	optional FeatureSet features = 1;

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

	extensions 1000 to max;
}

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];

	reserved 5;

	/*
	 * Enable the legacy handling of JSON field name conflicts.  This lowercases
	 * and strips underscored from the fields before comparison in proto3 only.
	 * The new behavior takes `json_name` into account and applies to proto2 as
	 * well.
	 * TODO Remove this legacy behavior once downstream teams have
	 * had time to migrate.
	 */
	optional bool deprecated_legacy_json_field_conflicts = 6 [deprecated = true];

	/* Any features defined in the specific edition. */
	optional FeatureSet features = 7;

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

	extensions 1000 to max;
}

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];

	/* Any features defined in the specific edition. */
	optional FeatureSet features = 2;

	/*
	 * Indicate that fields annotated with this enum value should not be printed
	 * out when using debug formats, e.g. when the field contains sensitive
	 * credentials.
	 */
	optional bool debug_redact = 3 [default = false];

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

	extensions 1000 to max;
}

message ServiceOptions {
	/* Any features defined in the specific edition. */
	optional FeatureSet features = 34;

	/*
	 * Note:  Field numbers 1 through 32 are reserved for Google's internal RPC
	 *   framework.  We apologize for hoarding these numbers to ourselves, but
	 *   we were already using them long before we decided to release Protocol
	 *   Buffers.
	 */

	/*
	 * 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;
}

message MethodOptions {
	/*
	 * Note:  Field numbers 1 through 32 are reserved for Google's internal RPC
	 *   framework.  We apologize for hoarding these numbers to ourselves, but
	 *   we were already using them long before we decided to release Protocol
	 *   Buffers.
	 */

	/*
	 * 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];

	/*
	 * 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 */
	}

	optional IdempotencyLevel idempotency_level = 34 [default = IDEMPOTENCY_UNKNOWN];

	/* Any features defined in the specific edition. */
	optional FeatureSet features = 35;

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

	extensions 1000 to max;
}

/*
 * 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 {
	/*
	 * 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;
	}

	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;
}

/*
 * ===================================================================
 * Features
 */

/*
 * TODO Enums in C++ gencode (and potentially other languages) are
 * not well scoped.  This means that each of the feature enums below can clash
 * with each other.  The short names we've chosen maximize call-site
 * readability, but leave us very open to this scenario.  A future feature will
 * be designed and implemented to handle this, hopefully before we ever hit a
 * conflict here.
 */
message FeatureSet {
	enum FieldPresence {
		FIELD_PRESENCE_UNKNOWN = 0;

		EXPLICIT = 1;

		IMPLICIT = 2;

		LEGACY_REQUIRED = 3;
	}

	optional FieldPresence field_presence = 1 [
		retention = RETENTION_RUNTIME,
		targets = TARGET_TYPE_FIELD,
		targets = TARGET_TYPE_FILE,
		edition_defaults = { value: "EXPLICIT", edition: EDITION_PROTO2 },
		edition_defaults = { value: "IMPLICIT", edition: EDITION_PROTO3 },
		edition_defaults = { value: "EXPLICIT", edition: EDITION_2023 }
	];

	enum EnumType {
		ENUM_TYPE_UNKNOWN = 0;

		OPEN = 1;

		CLOSED = 2;
	}

	optional EnumType enum_type = 2 [
		retention = RETENTION_RUNTIME,
		targets = TARGET_TYPE_ENUM,
		targets = TARGET_TYPE_FILE,
		edition_defaults = { value: "CLOSED", edition: EDITION_PROTO2 },
		edition_defaults = { value: "OPEN", edition: EDITION_PROTO3 }
	];

	enum RepeatedFieldEncoding {
		REPEATED_FIELD_ENCODING_UNKNOWN = 0;

		PACKED = 1;

		EXPANDED = 2;
	}

	optional RepeatedFieldEncoding repeated_field_encoding = 3 [
		retention = RETENTION_RUNTIME,
		targets = TARGET_TYPE_FIELD,
		targets = TARGET_TYPE_FILE,
		edition_defaults = { value: "EXPANDED", edition: EDITION_PROTO2 },
		edition_defaults = { value: "PACKED", edition: EDITION_PROTO3 }
	];

	enum Utf8Validation {
		UTF8_VALIDATION_UNKNOWN = 0;

		VERIFY = 2;

		NONE = 3;
	}

	optional Utf8Validation utf8_validation = 4 [
		retention = RETENTION_RUNTIME,
		targets = TARGET_TYPE_FIELD,
		targets = TARGET_TYPE_FILE,
		edition_defaults = { value: "NONE", edition: EDITION_PROTO2 },
		edition_defaults = { value: "VERIFY", edition: EDITION_PROTO3 }
	];

	enum MessageEncoding {
		MESSAGE_ENCODING_UNKNOWN = 0;

		LENGTH_PREFIXED = 1;

		DELIMITED = 2;
	}

	optional MessageEncoding message_encoding = 5 [
		retention = RETENTION_RUNTIME,
		targets = TARGET_TYPE_FIELD,
		targets = TARGET_TYPE_FILE,
		edition_defaults = { value: "LENGTH_PREFIXED", edition: EDITION_PROTO2 }
	];

	enum JsonFormat {
		JSON_FORMAT_UNKNOWN = 0;

		ALLOW = 1;

		LEGACY_BEST_EFFORT = 2;
	}

	optional JsonFormat json_format = 6 [
		retention = RETENTION_RUNTIME,
		targets = TARGET_TYPE_MESSAGE,
		targets = TARGET_TYPE_ENUM,
		targets = TARGET_TYPE_FILE,
		edition_defaults = { value: "LEGACY_BEST_EFFORT", edition: EDITION_PROTO2 },
		edition_defaults = { value: "ALLOW", edition: EDITION_PROTO3 }
	];

	reserved 999;

	extensions 1000, 1001, 1002, 9995 to 9999, 10000;
}

/*
 * A compiled specification for the defaults of a set of features.  These
 * messages are generated from FeatureSet extensions and can be used to seed
 * feature resolution. The resolution with this object becomes a simple search
 * for the closest matching edition, followed by proto merges.
 */
message FeatureSetDefaults {
	/*
	 * A map from every known edition with a unique set of defaults to its
	 * defaults. Not all editions may be contained here.  For a given edition,
	 * the defaults at the closest matching edition ordered at or before it should
	 * be used.  This field must be in strict ascending order by edition.
	 */
	message FeatureSetEditionDefault {
		optional Edition edition = 3;

		optional FeatureSet features = 2;
	}

	repeated FeatureSetEditionDefault defaults = 1;

	/*
	 * The minimum supported edition (inclusive) when this was constructed.
	 * Editions before this will not have defaults.
	 */
	optional Edition minimum_edition = 4;

	/*
	 * The maximum known edition (inclusive) when this was constructed. Editions
	 * after this will not have reliable defaults.
	 */
	optional Edition maximum_edition = 5;
}

/*
 * ===================================================================
 * Optional source code info
 */

/*
 * 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 appears.
		 * 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;
	}
}

/*
 * 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 object. The end offset should be one past
		 * the last relevant byte (so the length of the text = end - begin).
		 */
		optional int32 end = 4;

		/*
		 * Represents the identified object's effect on the element in the original
		 * .proto file.
		 */
		enum Semantic {
			/* There is no effect or the effect is indescribable. */
			NONE = 0;

			/* The element is set or otherwise mutated. */
			SET = 1;

			/* An alias to the element is returned. */
			ALIAS = 2;
		}

		optional Semantic semantic = 5;
	}
}