diff --git a/tools/aconfig/protos/aconfig.proto b/tools/aconfig/protos/aconfig.proto
index 9d36a9e..489939c 100644
--- a/tools/aconfig/protos/aconfig.proto
+++ b/tools/aconfig/protos/aconfig.proto
@@ -40,12 +40,12 @@
 };
 
 message flag_declarations {
-  required string namespace = 1;
+  required string package = 1;
   repeated flag_declaration flag = 2;
 };
 
 message flag_value {
-  required string namespace = 1;
+  required string package = 1;
   required string name = 2;
   required flag_state state = 3;
   required flag_permission permission = 4;
@@ -65,7 +65,7 @@
 }
 
 message parsed_flag {
-  required string namespace = 1;
+  required string package = 1;
   required string name = 2;
   required string description = 3;
   required flag_state state = 4;
diff --git a/tools/aconfig/src/aconfig.rs b/tools/aconfig/src/aconfig.rs
index b9fa324..42762e2 100644
--- a/tools/aconfig/src/aconfig.rs
+++ b/tools/aconfig/src/aconfig.rs
@@ -109,7 +109,7 @@
 
 #[derive(Debug, PartialEq, Eq)]
 pub struct FlagDeclarations {
-    pub namespace: String,
+    pub package: String,
     pub flags: Vec<FlagDeclaration>,
 }
 
@@ -117,20 +117,20 @@
     pub fn try_from_text_proto(text_proto: &str) -> Result<FlagDeclarations> {
         let proto: ProtoFlagDeclarations = crate::protos::try_from_text_proto(text_proto)
             .with_context(|| text_proto.to_owned())?;
-        let Some(namespace) = proto.namespace else {
-            bail!("missing 'namespace' field");
+        let Some(package) = proto.package else {
+            bail!("missing 'package' field");
         };
         let mut flags = vec![];
         for proto_flag in proto.flag.into_iter() {
             flags.push(proto_flag.try_into()?);
         }
-        Ok(FlagDeclarations { namespace, flags })
+        Ok(FlagDeclarations { package, flags })
     }
 }
 
 #[derive(Debug, PartialEq, Eq)]
 pub struct FlagValue {
-    pub namespace: String,
+    pub package: String,
     pub name: String,
     pub state: FlagState,
     pub permission: Permission,
@@ -153,8 +153,8 @@
     type Error = Error;
 
     fn try_from(proto: ProtoFlagValue) -> Result<Self, Self::Error> {
-        let Some(namespace) = proto.namespace else {
-            bail!("missing 'namespace' field");
+        let Some(package) = proto.package else {
+            bail!("missing 'package' field");
         };
         let Some(name) = proto.name else {
             bail!("missing 'name' field");
@@ -167,7 +167,7 @@
             bail!("missing 'permission' field");
         };
         let permission = proto_permission.try_into()?;
-        Ok(FlagValue { namespace, name, state, permission })
+        Ok(FlagValue { package, name, state, permission })
     }
 }
 
@@ -184,7 +184,7 @@
 impl From<Item> for ProtoParsedFlag {
     fn from(item: Item) -> Self {
         let mut proto = crate::protos::ProtoParsedFlag::new();
-        proto.set_namespace(item.namespace.to_owned());
+        proto.set_package(item.package.to_owned());
         proto.set_name(item.name.clone());
         proto.set_description(item.description.clone());
         proto.set_state(item.state.into());
@@ -242,9 +242,9 @@
     }
 
     #[test]
-    fn test_namespace_try_from_text_proto() {
+    fn test_package_try_from_text_proto() {
         let expected = FlagDeclarations {
-            namespace: "ns".to_owned(),
+            package: "ns".to_owned(),
             flags: vec![
                 FlagDeclaration { name: "a".to_owned(), description: "A".to_owned() },
                 FlagDeclaration { name: "b".to_owned(), description: "B".to_owned() },
@@ -252,7 +252,7 @@
         };
 
         let s = r#"
-        namespace: "ns"
+        package: "ns"
         flag {
             name: "a"
             description: "A"
@@ -270,14 +270,14 @@
     #[test]
     fn test_flag_declaration_try_from_text_proto_list() {
         let expected = FlagValue {
-            namespace: "ns".to_owned(),
+            package: "ns".to_owned(),
             name: "1234".to_owned(),
             state: FlagState::Enabled,
             permission: Permission::ReadOnly,
         };
 
         let s = r#"
-        namespace: "ns"
+        package: "ns"
         name: "1234"
         state: ENABLED
         permission: READ_ONLY
diff --git a/tools/aconfig/src/cache.rs b/tools/aconfig/src/cache.rs
index 972ba41..f531aab 100644
--- a/tools/aconfig/src/cache.rs
+++ b/tools/aconfig/src/cache.rs
@@ -34,11 +34,11 @@
 
 #[derive(Serialize, Deserialize, Debug)]
 pub struct Item {
-    // TODO: duplicating the Cache.namespace as Item.namespace makes the internal representation
+    // TODO: duplicating the Cache.package as Item.package makes the internal representation
     // closer to the proto message `parsed_flag`; hopefully this will enable us to replace the Item
-    // struct and use a newtype instead once aconfig has matured. Until then, namespace should
+    // struct and use a newtype instead once aconfig has matured. Until then, package should
     // really be a Cow<String>.
-    pub namespace: String,
+    pub package: String,
     pub name: String,
     pub description: String,
     pub state: FlagState,
@@ -48,7 +48,7 @@
 
 #[derive(Serialize, Deserialize, Debug)]
 pub struct Cache {
-    namespace: String,
+    package: String,
     items: Vec<Item>,
 }
 
@@ -96,9 +96,9 @@
         self.items.into_iter()
     }
 
-    pub fn namespace(&self) -> &str {
-        debug_assert!(!self.namespace.is_empty());
-        &self.namespace
+    pub fn package(&self) -> &str {
+        debug_assert!(!self.package.is_empty());
+        &self.package
     }
 }
 
@@ -108,9 +108,9 @@
 }
 
 impl CacheBuilder {
-    pub fn new(namespace: String) -> Result<CacheBuilder> {
-        ensure!(codegen::is_valid_identifier(&namespace), "bad namespace");
-        let cache = Cache { namespace, items: vec![] };
+    pub fn new(package: String) -> Result<CacheBuilder> {
+        ensure!(codegen::is_valid_identifier(&package), "bad package");
+        let cache = Cache { package, items: vec![] };
         Ok(CacheBuilder { cache })
     }
 
@@ -128,7 +128,7 @@
             source
         );
         self.cache.items.push(Item {
-            namespace: self.cache.namespace.clone(),
+            package: self.cache.package.clone(),
             name: declaration.name.clone(),
             description: declaration.description,
             state: DEFAULT_FLAG_STATE,
@@ -147,18 +147,18 @@
         source: Source,
         value: FlagValue,
     ) -> Result<&mut CacheBuilder> {
-        ensure!(codegen::is_valid_identifier(&value.namespace), "bad flag namespace");
+        ensure!(codegen::is_valid_identifier(&value.package), "bad flag package");
         ensure!(codegen::is_valid_identifier(&value.name), "bad flag name");
         ensure!(
-            value.namespace == self.cache.namespace,
-            "failed to set values for flag {}/{} from {}: expected namespace {}",
-            value.namespace,
+            value.package == self.cache.package,
+            "failed to set values for flag {}/{} from {}: expected package {}",
+            value.package,
             value.name,
             source,
-            self.cache.namespace
+            self.cache.package
         );
         let Some(existing_item) = self.cache.items.iter_mut().find(|item| item.name == value.name) else {
-            bail!("failed to set values for flag {}/{} from {}: flag not declared", value.namespace, value.name, source);
+            bail!("failed to set values for flag {}/{} from {}: flag not declared", value.package, value.name, source);
         };
         existing_item.state = value.state;
         existing_item.permission = value.permission;
@@ -222,7 +222,7 @@
             .add_flag_value(
                 Source::Memory,
                 FlagValue {
-                    namespace: "ns".to_string(),
+                    package: "ns".to_string(),
                     name: "foo".to_string(),
                     state: FlagState::Enabled,
                     permission: Permission::ReadOnly,
@@ -245,7 +245,7 @@
             .add_flag_value(
                 Source::Memory,
                 FlagValue {
-                    namespace: "ns".to_string(),
+                    package: "ns".to_string(),
                     name: "foo".to_string(),
                     state: FlagState::Disabled,
                     permission: Permission::ReadOnly,
@@ -257,7 +257,7 @@
             .add_flag_value(
                 Source::Memory,
                 FlagValue {
-                    namespace: "ns".to_string(),
+                    package: "ns".to_string(),
                     name: "foo".to_string(),
                     state: FlagState::Enabled,
                     permission: Permission::ReadWrite,
@@ -265,19 +265,19 @@
             )
             .unwrap();
 
-        // different namespace -> no-op
+        // different package -> no-op
         let error = builder
             .add_flag_value(
                 Source::Memory,
                 FlagValue {
-                    namespace: "some_other_namespace".to_string(),
+                    package: "some_other_package".to_string(),
                     name: "foo".to_string(),
                     state: FlagState::Enabled,
                     permission: Permission::ReadOnly,
                 },
             )
             .unwrap_err();
-        assert_eq!(&format!("{:?}", error), "failed to set values for flag some_other_namespace/foo from <memory>: expected namespace ns");
+        assert_eq!(&format!("{:?}", error), "failed to set values for flag some_other_package/foo from <memory>: expected package ns");
 
         let cache = builder.build();
         let item = cache.iter().find(|&item| item.name == "foo").unwrap();
@@ -286,7 +286,7 @@
     }
 
     #[test]
-    fn test_reject_empty_cache_namespace() {
+    fn test_reject_empty_cache_package() {
         CacheBuilder::new("".to_string()).unwrap_err();
     }
 
@@ -325,20 +325,20 @@
             .add_flag_value(
                 Source::Memory,
                 FlagValue {
-                    namespace: "".to_string(),
+                    package: "".to_string(),
                     name: "foo".to_string(),
                     state: FlagState::Enabled,
                     permission: Permission::ReadOnly,
                 },
             )
             .unwrap_err();
-        assert_eq!(&format!("{:?}", error), "bad flag namespace");
+        assert_eq!(&format!("{:?}", error), "bad flag package");
 
         let error = builder
             .add_flag_value(
                 Source::Memory,
                 FlagValue {
-                    namespace: "ns".to_string(),
+                    package: "ns".to_string(),
                     name: "".to_string(),
                     state: FlagState::Enabled,
                     permission: Permission::ReadOnly,
diff --git a/tools/aconfig/src/codegen_cpp.rs b/tools/aconfig/src/codegen_cpp.rs
index 2aeea6a..e27db9b 100644
--- a/tools/aconfig/src/codegen_cpp.rs
+++ b/tools/aconfig/src/codegen_cpp.rs
@@ -25,18 +25,18 @@
 pub fn generate_cpp_code(cache: &Cache) -> Result<OutputFile> {
     let class_elements: Vec<ClassElement> = cache.iter().map(create_class_element).collect();
     let readwrite = class_elements.iter().any(|item| item.readwrite);
-    let namespace = cache.namespace().to_lowercase();
-    let context = Context { namespace: namespace.clone(), readwrite, class_elements };
+    let package = cache.package().to_lowercase();
+    let context = Context { package: package.clone(), readwrite, class_elements };
     let mut template = TinyTemplate::new();
     template.add_template("cpp_code_gen", include_str!("../templates/cpp.template"))?;
     let contents = template.render("cpp_code_gen", &context)?;
-    let path = ["aconfig", &(namespace + ".h")].iter().collect();
+    let path = ["aconfig", &(package + ".h")].iter().collect();
     Ok(OutputFile { contents: contents.into(), path })
 }
 
 #[derive(Serialize)]
 struct Context {
-    pub namespace: String,
+    pub package: String,
     pub readwrite: bool,
     pub class_elements: Vec<ClassElement>,
 }
@@ -69,8 +69,8 @@
 
     #[test]
     fn test_cpp_codegen_build_time_flag_only() {
-        let namespace = "my_namespace";
-        let mut builder = CacheBuilder::new(namespace.to_string()).unwrap();
+        let package = "my_package";
+        let mut builder = CacheBuilder::new(package.to_string()).unwrap();
         builder
             .add_flag_declaration(
                 Source::File("aconfig_one.txt".to_string()),
@@ -83,7 +83,7 @@
             .add_flag_value(
                 Source::Memory,
                 FlagValue {
-                    namespace: namespace.to_string(),
+                    package: package.to_string(),
                     name: "my_flag_one".to_string(),
                     state: FlagState::Disabled,
                     permission: Permission::ReadOnly,
@@ -101,7 +101,7 @@
             .add_flag_value(
                 Source::Memory,
                 FlagValue {
-                    namespace: namespace.to_string(),
+                    package: package.to_string(),
                     name: "my_flag_two".to_string(),
                     state: FlagState::Enabled,
                     permission: Permission::ReadOnly,
@@ -109,11 +109,11 @@
             )
             .unwrap();
         let cache = builder.build();
-        let expect_content = r#"#ifndef my_namespace_HEADER_H
-        #define my_namespace_HEADER_H
-        #include "my_namespace.h"
+        let expect_content = r#"#ifndef my_package_HEADER_H
+        #define my_package_HEADER_H
+        #include "my_package.h"
 
-        namespace my_namespace {
+        namespace my_package {
 
             class my_flag_one {
                 public:
@@ -133,7 +133,7 @@
         #endif
         "#;
         let file = generate_cpp_code(&cache).unwrap();
-        assert_eq!("aconfig/my_namespace.h", file.path.to_str().unwrap());
+        assert_eq!("aconfig/my_package.h", file.path.to_str().unwrap());
         assert_eq!(
             expect_content.replace(' ', ""),
             String::from_utf8(file.contents).unwrap().replace(' ', "")
@@ -142,8 +142,8 @@
 
     #[test]
     fn test_cpp_codegen_runtime_flag() {
-        let namespace = "my_namespace";
-        let mut builder = CacheBuilder::new(namespace.to_string()).unwrap();
+        let package = "my_package";
+        let mut builder = CacheBuilder::new(package.to_string()).unwrap();
         builder
             .add_flag_declaration(
                 Source::File("aconfig_one.txt".to_string()),
@@ -164,7 +164,7 @@
             .add_flag_value(
                 Source::Memory,
                 FlagValue {
-                    namespace: namespace.to_string(),
+                    package: package.to_string(),
                     name: "my_flag_two".to_string(),
                     state: FlagState::Enabled,
                     permission: Permission::ReadWrite,
@@ -172,20 +172,20 @@
             )
             .unwrap();
         let cache = builder.build();
-        let expect_content = r#"#ifndef my_namespace_HEADER_H
-        #define my_namespace_HEADER_H
-        #include "my_namespace.h"
+        let expect_content = r#"#ifndef my_package_HEADER_H
+        #define my_package_HEADER_H
+        #include "my_package.h"
 
         #include <server_configurable_flags/get_flags.h>
         using namespace server_configurable_flags;
 
-        namespace my_namespace {
+        namespace my_package {
 
             class my_flag_one {
                 public:
                     virtual const bool value() {
                         return GetServerConfigurableFlag(
-                            "my_namespace",
+                            "my_package",
                             "my_flag_one",
                             "false") == "true";
                     }
@@ -195,7 +195,7 @@
                 public:
                     virtual const bool value() {
                         return GetServerConfigurableFlag(
-                            "my_namespace",
+                            "my_package",
                             "my_flag_two",
                             "true") == "true";
                     }
@@ -205,7 +205,7 @@
         #endif
         "#;
         let file = generate_cpp_code(&cache).unwrap();
-        assert_eq!("aconfig/my_namespace.h", file.path.to_str().unwrap());
+        assert_eq!("aconfig/my_package.h", file.path.to_str().unwrap());
         assert_eq!(
             expect_content.replace(' ', ""),
             String::from_utf8(file.contents).unwrap().replace(' ', "")
diff --git a/tools/aconfig/src/codegen_java.rs b/tools/aconfig/src/codegen_java.rs
index 98288e7..c92e87c 100644
--- a/tools/aconfig/src/codegen_java.rs
+++ b/tools/aconfig/src/codegen_java.rs
@@ -26,12 +26,12 @@
 pub fn generate_java_code(cache: &Cache) -> Result<OutputFile> {
     let class_elements: Vec<ClassElement> = cache.iter().map(create_class_element).collect();
     let readwrite = class_elements.iter().any(|item| item.readwrite);
-    let namespace = cache.namespace();
-    let context = Context { namespace: namespace.to_string(), readwrite, class_elements };
+    let package = cache.package();
+    let context = Context { package: package.to_string(), readwrite, class_elements };
     let mut template = TinyTemplate::new();
     template.add_template("java_code_gen", include_str!("../templates/java.template"))?;
     let contents = template.render("java_code_gen", &context)?;
-    let mut path: PathBuf = ["aconfig", namespace].iter().collect();
+    let mut path: PathBuf = ["aconfig", package].iter().collect();
     // TODO: Allow customization of the java class name
     path.push("Flags.java");
     Ok(OutputFile { contents: contents.into(), path })
@@ -39,7 +39,7 @@
 
 #[derive(Serialize)]
 struct Context {
-    pub namespace: String,
+    pub package: String,
     pub readwrite: bool,
     pub class_elements: Vec<ClassElement>,
 }
@@ -76,8 +76,8 @@
 
     #[test]
     fn test_generate_java_code() {
-        let namespace = "example";
-        let mut builder = CacheBuilder::new(namespace.to_string()).unwrap();
+        let package = "example";
+        let mut builder = CacheBuilder::new(package.to_string()).unwrap();
         builder
             .add_flag_declaration(
                 Source::File("test.txt".to_string()),
@@ -98,7 +98,7 @@
             .add_flag_value(
                 Source::Memory,
                 FlagValue {
-                    namespace: namespace.to_string(),
+                    package: package.to_string(),
                     name: "test".to_string(),
                     state: FlagState::Disabled,
                     permission: Permission::ReadOnly,
diff --git a/tools/aconfig/src/codegen_rust.rs b/tools/aconfig/src/codegen_rust.rs
index a48e464..e972185 100644
--- a/tools/aconfig/src/codegen_rust.rs
+++ b/tools/aconfig/src/codegen_rust.rs
@@ -23,10 +23,10 @@
 use crate::commands::OutputFile;
 
 pub fn generate_rust_code(cache: &Cache) -> Result<OutputFile> {
-    let namespace = cache.namespace();
+    let package = cache.package();
     let parsed_flags: Vec<TemplateParsedFlag> =
-        cache.iter().map(|item| create_template_parsed_flag(namespace, item)).collect();
-    let context = TemplateContext { namespace: namespace.to_string(), parsed_flags };
+        cache.iter().map(|item| create_template_parsed_flag(package, item)).collect();
+    let context = TemplateContext { package: package.to_string(), parsed_flags };
     let mut template = TinyTemplate::new();
     template.add_template("rust_code_gen", include_str!("../templates/rust.template"))?;
     let contents = template.render("rust_code_gen", &context)?;
@@ -36,7 +36,7 @@
 
 #[derive(Serialize)]
 struct TemplateContext {
-    pub namespace: String,
+    pub package: String,
     pub parsed_flags: Vec<TemplateParsedFlag>,
 }
 
@@ -53,10 +53,10 @@
 }
 
 #[allow(clippy::nonminimal_bool)]
-fn create_template_parsed_flag(namespace: &str, item: &Item) -> TemplateParsedFlag {
+fn create_template_parsed_flag(package: &str, item: &Item) -> TemplateParsedFlag {
     let template = TemplateParsedFlag {
         name: item.name.clone(),
-        fn_name: format!("{}_{}", namespace, &item.name),
+        fn_name: format!("{}_{}", package, &item.name),
         is_read_only_enabled: item.permission == Permission::ReadOnly
             && item.state == FlagState::Enabled,
         is_read_only_disabled: item.permission == Permission::ReadOnly
diff --git a/tools/aconfig/src/commands.rs b/tools/aconfig/src/commands.rs
index 3ae72c6..bc392e8 100644
--- a/tools/aconfig/src/commands.rs
+++ b/tools/aconfig/src/commands.rs
@@ -55,12 +55,8 @@
     pub contents: Vec<u8>,
 }
 
-pub fn create_cache(
-    namespace: &str,
-    declarations: Vec<Input>,
-    values: Vec<Input>,
-) -> Result<Cache> {
-    let mut builder = CacheBuilder::new(namespace.to_owned())?;
+pub fn create_cache(package: &str, declarations: Vec<Input>, values: Vec<Input>) -> Result<Cache> {
+    let mut builder = CacheBuilder::new(package.to_owned())?;
 
     for mut input in declarations {
         let mut contents = String::new();
@@ -68,11 +64,11 @@
         let dec_list = FlagDeclarations::try_from_text_proto(&contents)
             .with_context(|| format!("Failed to parse {}", input.source))?;
         ensure!(
-            namespace == dec_list.namespace,
-            "Failed to parse {}: expected namespace {}, got {}",
+            package == dec_list.package,
+            "Failed to parse {}: expected package {}, got {}",
             input.source,
-            namespace,
-            dec_list.namespace
+            package,
+            dec_list.package
         );
         for d in dec_list.flags.into_iter() {
             builder.add_flag_declaration(input.source.clone(), d)?;
@@ -111,7 +107,7 @@
     {
         let line = format!(
             "{}/{}:{}\n",
-            item.namespace,
+            item.package,
             item.name,
             match item.state {
                 FlagState::Enabled => "enabled",
@@ -129,7 +125,7 @@
     {
         let line = format!(
             "persist.device_config.{}.{}={}\n",
-            item.namespace,
+            item.package,
             item.name,
             match item.state {
                 FlagState::Enabled => "true",
@@ -155,7 +151,7 @@
             for item in sort_and_iter_items(caches) {
                 let line = format!(
                     "{}/{}: {:?} {:?}\n",
-                    item.namespace, item.name, item.state, item.permission
+                    item.package, item.name, item.state, item.permission
                 );
                 output.extend_from_slice(line.as_bytes());
             }
@@ -181,7 +177,7 @@
 }
 
 fn sort_and_iter_caches(mut caches: Vec<Cache>) -> impl Iterator<Item = Cache> {
-    caches.sort_by_cached_key(|cache| cache.namespace().to_string());
+    caches.sort_by_cached_key(|cache| cache.package().to_string());
     caches.into_iter()
 }
 
@@ -192,7 +188,7 @@
 
     fn create_test_cache_ns1() -> Cache {
         let s = r#"
-        namespace: "ns1"
+        package: "ns1"
         flag {
             name: "a"
             description: "Description of a"
@@ -205,7 +201,7 @@
         let declarations = vec![Input { source: Source::Memory, reader: Box::new(s.as_bytes()) }];
         let o = r#"
         flag_value {
-            namespace: "ns1"
+            package: "ns1"
             name: "a"
             state: DISABLED
             permission: READ_ONLY
@@ -217,7 +213,7 @@
 
     fn create_test_cache_ns2() -> Cache {
         let s = r#"
-        namespace: "ns2"
+        package: "ns2"
         flag {
             name: "c"
             description: "Description of c"
@@ -226,7 +222,7 @@
         let declarations = vec![Input { source: Source::Memory, reader: Box::new(s.as_bytes()) }];
         let o = r#"
         flag_value {
-            namespace: "ns2"
+            package: "ns2"
             name: "c"
             state: DISABLED
             permission: READ_ONLY
@@ -284,7 +280,7 @@
 
         let item =
             actual.parsed_flag.iter().find(|item| item.name == Some("b".to_string())).unwrap();
-        assert_eq!(item.namespace(), "ns1");
+        assert_eq!(item.package(), "ns1");
         assert_eq!(item.name(), "b");
         assert_eq!(item.description(), "Description of b");
         assert_eq!(item.state(), ProtoFlagState::DISABLED);
@@ -304,7 +300,7 @@
         assert_eq!(
             dump.parsed_flag
                 .iter()
-                .map(|parsed_flag| format!("{}/{}", parsed_flag.namespace(), parsed_flag.name()))
+                .map(|parsed_flag| format!("{}/{}", parsed_flag.package(), parsed_flag.name()))
                 .collect::<Vec<_>>(),
             vec!["ns1/a".to_string(), "ns1/b".to_string(), "ns2/c".to_string()]
         );
diff --git a/tools/aconfig/src/main.rs b/tools/aconfig/src/main.rs
index dab0191..5a820d9 100644
--- a/tools/aconfig/src/main.rs
+++ b/tools/aconfig/src/main.rs
@@ -44,7 +44,7 @@
         .subcommand_required(true)
         .subcommand(
             Command::new("create-cache")
-                .arg(Arg::new("namespace").long("namespace").required(true))
+                .arg(Arg::new("package").long("package").required(true))
                 .arg(Arg::new("declarations").long("declarations").action(ArgAction::Append))
                 .arg(Arg::new("values").long("values").action(ArgAction::Append))
                 .arg(Arg::new("cache").long("cache").required(true)),
@@ -134,10 +134,10 @@
     let matches = cli().get_matches();
     match matches.subcommand() {
         Some(("create-cache", sub_matches)) => {
-            let namespace = get_required_arg::<String>(sub_matches, "namespace")?;
+            let package = get_required_arg::<String>(sub_matches, "package")?;
             let declarations = open_zero_or_more_files(sub_matches, "declarations")?;
             let values = open_zero_or_more_files(sub_matches, "values")?;
-            let cache = commands::create_cache(namespace, declarations, values)?;
+            let cache = commands::create_cache(package, declarations, values)?;
             let path = get_required_arg::<String>(sub_matches, "cache")?;
             let file = fs::File::create(path)?;
             cache.write_to_writer(file)?;
diff --git a/tools/aconfig/templates/cpp.template b/tools/aconfig/templates/cpp.template
index ae8b59f..deb5012 100644
--- a/tools/aconfig/templates/cpp.template
+++ b/tools/aconfig/templates/cpp.template
@@ -1,18 +1,18 @@
-#ifndef {namespace}_HEADER_H
-#define {namespace}_HEADER_H
-#include "{namespace}.h"
+#ifndef {package}_HEADER_H
+#define {package}_HEADER_H
+#include "{package}.h"
 {{ if readwrite }}
 #include <server_configurable_flags/get_flags.h>
 using namespace server_configurable_flags;
 {{ endif }}
-namespace {namespace} \{
+namespace {package} \{
     {{ for item in class_elements}}
     class {item.flag_name} \{
         public:
             virtual const bool value() \{
                 {{ if item.readwrite- }}
                 return GetServerConfigurableFlag(
-                    "{namespace}",
+                    "{package}",
                     "{item.flag_name}",
                     "{item.default_value}") == "true";
                 {{ -else- }}
diff --git a/tools/aconfig/templates/java.template b/tools/aconfig/templates/java.template
index 30c7ad7..44c470c 100644
--- a/tools/aconfig/templates/java.template
+++ b/tools/aconfig/templates/java.template
@@ -1,4 +1,4 @@
-package aconfig.{namespace};
+package aconfig.{package};
 {{ if readwrite }}
 import android.provider.DeviceConfig;
 {{ endif }}
@@ -7,7 +7,7 @@
     public static boolean {item.method_name}() \{
         {{ if item.readwrite- }}
         return DeviceConfig.getBoolean(
-            "{namespace}",
+            "{package}",
             "{item.feature_name}__{item.flag_name}",
             {item.default_value}
         );
diff --git a/tools/aconfig/templates/rust.template b/tools/aconfig/templates/rust.template
index d7f4e8d..a3c58c0 100644
--- a/tools/aconfig/templates/rust.template
+++ b/tools/aconfig/templates/rust.template
@@ -16,7 +16,7 @@
 {{- if parsed_flag.is_read_write -}}
 #[inline(always)]
 pub fn r#{parsed_flag.fn_name}() -> bool \{
-    flags_rust::GetServerConfigurableFlag("{namespace}", "{parsed_flag.name}", "false") == "true"
+    flags_rust::GetServerConfigurableFlag("{package}", "{parsed_flag.name}", "false") == "true"
 }
 
 {{ endif -}}
diff --git a/tools/aconfig/testdata/first.values b/tools/aconfig/testdata/first.values
index 3c49111..c7b8a65 100644
--- a/tools/aconfig/testdata/first.values
+++ b/tools/aconfig/testdata/first.values
@@ -1,17 +1,17 @@
 flag_value {
-    namespace: "test"
+    package: "test"
     name: "disabled_ro"
     state: DISABLED
     permission: READ_ONLY
 }
 flag_value {
-    namespace: "test"
+    package: "test"
     name: "enabled_ro"
     state: DISABLED
     permission: READ_WRITE
 }
 flag_value {
-    namespace: "test"
+    package: "test"
     name: "enabled_rw"
     state: ENABLED
     permission: READ_WRITE
diff --git a/tools/aconfig/testdata/second.values b/tools/aconfig/testdata/second.values
index 3fe11ab..895b75b 100644
--- a/tools/aconfig/testdata/second.values
+++ b/tools/aconfig/testdata/second.values
@@ -1,5 +1,5 @@
 flag_value {
-    namespace: "test"
+    package: "test"
     name: "enabled_ro"
     state: ENABLED
     permission: READ_ONLY
diff --git a/tools/aconfig/testdata/test.aconfig b/tools/aconfig/testdata/test.aconfig
index 986a526..ff07473 100644
--- a/tools/aconfig/testdata/test.aconfig
+++ b/tools/aconfig/testdata/test.aconfig
@@ -1,4 +1,4 @@
-namespace: "test"
+package: "test"
 
 # This flag's final value is calculated from:
 # - test.aconfig: DISABLED + READ_WRITE (default)