diff --git a/src/metadata/file.rs b/src/metadata/file.rs
index 4556a0b0..13693736 100644
--- a/src/metadata/file.rs
+++ b/src/metadata/file.rs
@@ -38,14 +38,14 @@ impl File {
     /// CommonMark.
     #[must_use]
     pub fn with_display_name(mut self, display_name: String) -> Self {
-        self.display_name = Some(display_name);
+        self.set_display_name(display_name);
         self
     }
 
     /// Set the condition string.
     #[must_use]
     pub fn with_condition(mut self, condition: String) -> Self {
-        self.condition = Some(condition);
+        self.set_condition(condition);
         self
     }
 
@@ -56,8 +56,7 @@ impl File {
         mut self,
         detail: Vec<MessageContent>,
     ) -> Result<Self, MultilingualMessageContentsError> {
-        validate_message_contents(&detail)?;
-        self.detail = detail;
+        self.set_detail(detail)?;
         Ok(self)
     }
 
@@ -71,6 +70,13 @@ impl File {
         self.display_name.as_deref()
     }
 
+    /// Set the name to be displayed for the file in messages, formatted using
+    /// CommonMark.
+    pub fn set_display_name(&mut self, display_name: String) -> &mut Self {
+        self.display_name = Some(display_name);
+        self
+    }
+
     /// Get the detail message content of the file.
     ///
     /// If this file causes an error message to be displayed, the detail message
@@ -80,10 +86,28 @@ impl File {
         &self.detail
     }
 
+    /// Set the detail message content, which may be appended to any messages
+    /// generated for this file. If multilingual, one language must be
+    /// [MessageContent::DEFAULT_LANGUAGE].
+    pub fn set_detail(
+        &mut self,
+        detail: Vec<MessageContent>,
+    ) -> Result<&mut Self, MultilingualMessageContentsError> {
+        validate_message_contents(&detail)?;
+        self.detail = detail;
+        Ok(self)
+    }
+
     /// Get the condition string.
     pub fn condition(&self) -> Option<&str> {
         self.condition.as_deref()
     }
+
+    /// Set the condition string.
+    pub fn set_condition(&mut self, condition: String) -> &mut Self {
+        self.condition = Some(condition);
+        self
+    }
 }
 
 /// Represents a case-insensitive filename.
diff --git a/src/metadata/group.rs b/src/metadata/group.rs
index 104b5b76..f976e71d 100644
--- a/src/metadata/group.rs
+++ b/src/metadata/group.rs
@@ -27,14 +27,14 @@ impl Group {
     /// Set a description for the group.
     #[must_use]
     pub fn with_description(mut self, description: String) -> Self {
-        self.description = Some(description);
+        self.set_description(description);
         self
     }
 
     /// Set the names of the groups that this group loads after.
     #[must_use]
     pub fn with_after_groups(mut self, after_groups: Vec<String>) -> Self {
-        self.after_groups = after_groups;
+        self.set_after_groups(after_groups);
         self
     }
 
@@ -51,10 +51,22 @@ impl Group {
         self.description.as_deref()
     }
 
+    /// Set a description for the group.
+    pub fn set_description(&mut self, description: String) -> &mut Self {
+        self.description = Some(description);
+        self
+    }
+
     /// Get the names of the groups that this group loads after.
     pub fn after_groups(&self) -> &[String] {
         &self.after_groups
     }
+
+    /// Set the names of the groups that this group loads after.
+    pub fn set_after_groups(&mut self, after_groups: Vec<String>) -> &mut Self {
+        self.after_groups = after_groups;
+        self
+    }
 }
 
 impl std::default::Default for Group {
diff --git a/src/metadata/location.rs b/src/metadata/location.rs
index 66872672..ae7eb639 100644
--- a/src/metadata/location.rs
+++ b/src/metadata/location.rs
@@ -27,7 +27,7 @@ impl Location {
     /// Set a name for the URL, eg. the page or site name.
     #[must_use]
     pub fn with_name(mut self, name: String) -> Self {
-        self.name = Some(name);
+        self.set_name(name);
         self
     }
 
@@ -40,6 +40,12 @@ impl Location {
     pub fn name(&self) -> Option<&str> {
         self.name.as_deref()
     }
+
+    /// Set a name for the URL, eg. the page or site name.
+    pub fn set_name(&mut self, name: String) -> &mut Self {
+        self.name = Some(name);
+        self
+    }
 }
 
 impl TryFrom<&MarkedYaml> for Location {
diff --git a/src/metadata/message.rs b/src/metadata/message.rs
index 1c31868c..594be6f5 100644
--- a/src/metadata/message.rs
+++ b/src/metadata/message.rs
@@ -65,7 +65,7 @@ impl MessageContent {
     /// Set the language code to the given value.
     #[must_use]
     pub fn with_language(mut self, language: String) -> Self {
-        self.language = language;
+        self.set_language(language);
         self
     }
 
@@ -78,6 +78,12 @@ impl MessageContent {
     pub fn language(&self) -> &str {
         &self.language
     }
+
+    /// Set the language code to the given value.
+    pub fn set_language(&mut self, language: String) -> &mut Self {
+        self.language = language;
+        self
+    }
 }
 
 impl std::default::Default for MessageContent {
@@ -194,7 +200,7 @@ impl Message {
     /// Set the condition string.
     #[must_use]
     pub fn with_condition(mut self, condition: String) -> Self {
-        self.condition = Some(condition);
+        self.set_condition(condition);
         self
     }
 
@@ -212,6 +218,12 @@ impl Message {
     pub fn condition(&self) -> Option<&str> {
         self.condition.as_deref()
     }
+
+    /// Set the condition string.
+    pub fn set_condition(&mut self, condition: String) -> &mut Self {
+        self.condition = Some(condition);
+        self
+    }
 }
 
 pub(crate) fn validate_message_contents(
diff --git a/src/metadata/plugin_cleaning_data.rs b/src/metadata/plugin_cleaning_data.rs
index db990fc2..550a077e 100644
--- a/src/metadata/plugin_cleaning_data.rs
+++ b/src/metadata/plugin_cleaning_data.rs
@@ -38,21 +38,21 @@ impl PluginCleaningData {
     /// Set the number of Identical To Master records found in the plugin.
     #[must_use]
     pub fn with_itm_count(mut self, itm_count: u32) -> Self {
-        self.itm_count = itm_count;
+        self.set_itm_count(itm_count);
         self
     }
 
     /// Set the number of deleted references found in the plugin.
     #[must_use]
     pub fn with_deleted_reference_count(mut self, deleted_reference_count: u32) -> Self {
-        self.deleted_reference_count = deleted_reference_count;
+        self.set_deleted_reference_count(deleted_reference_count);
         self
     }
 
     /// Set the number of deleted navmeshes found in the plugin.
     #[must_use]
     pub fn with_deleted_navmesh_count(mut self, deleted_navmesh_count: u32) -> Self {
-        self.deleted_navmesh_count = deleted_navmesh_count;
+        self.set_deleted_navmesh_count(deleted_navmesh_count);
         self
     }
 
@@ -63,8 +63,7 @@ impl PluginCleaningData {
         mut self,
         detail: Vec<MessageContent>,
     ) -> Result<Self, MultilingualMessageContentsError> {
-        validate_message_contents(&detail)?;
-        self.detail = detail;
+        self.set_detail(detail)?;
         Ok(self)
     }
 
@@ -78,16 +77,34 @@ impl PluginCleaningData {
         self.itm_count
     }
 
+    /// Set the number of Identical To Master records found in the plugin.
+    pub fn set_itm_count(&mut self, itm_count: u32) -> &mut Self {
+        self.itm_count = itm_count;
+        self
+    }
+
     /// Get the number of deleted references found in the plugin.
     pub fn deleted_reference_count(&self) -> u32 {
         self.deleted_reference_count
     }
 
+    /// Set the number of deleted references found in the plugin.
+    pub fn set_deleted_reference_count(&mut self, deleted_reference_count: u32) -> &mut Self {
+        self.deleted_reference_count = deleted_reference_count;
+        self
+    }
+
     /// Get the number of deleted navmeshes found in the plugin.
     pub fn deleted_navmesh_count(&self) -> u32 {
         self.deleted_navmesh_count
     }
 
+    /// Set the number of deleted navmeshes found in the plugin.
+    pub fn set_deleted_navmesh_count(&mut self, deleted_navmesh_count: u32) -> &mut Self {
+        self.deleted_navmesh_count = deleted_navmesh_count;
+        self
+    }
+
     /// Get the cleaning utility that was used to check the plugin.
     ///
     /// The string may include a cleaning utility name, possibly related
@@ -103,6 +120,18 @@ impl PluginCleaningData {
     pub fn detail(&self) -> &[MessageContent] {
         &self.detail
     }
+
+    /// Set the detail message content, which may be appended to any messages
+    /// generated for this cleaning data. If multilingual, one language must be
+    /// [MessageContent::DEFAULT_LANGUAGE].
+    pub fn set_detail(
+        &mut self,
+        detail: Vec<MessageContent>,
+    ) -> Result<&mut Self, MultilingualMessageContentsError> {
+        validate_message_contents(&detail)?;
+        self.detail = detail;
+        Ok(self)
+    }
 }
 
 impl TryFrom<&MarkedYaml> for PluginCleaningData {
diff --git a/src/metadata/tag.rs b/src/metadata/tag.rs
index e6fcbf0e..d63a6b84 100644
--- a/src/metadata/tag.rs
+++ b/src/metadata/tag.rs
@@ -54,6 +54,12 @@ impl Tag {
     pub fn condition(&self) -> Option<&str> {
         self.condition.as_deref()
     }
+
+    /// Set the condition string.
+    pub fn set_condition(&mut self, condition: String) -> &mut Self {
+        self.condition = Some(condition);
+        self
+    }
 }
 
 impl TryFrom<&saphyr::MarkedYaml> for Tag {
diff --git a/src/sorting/vertex.rs b/src/sorting/vertex.rs
index 0c4b8f38..0b96ae33 100644
--- a/src/sorting/vertex.rs
+++ b/src/sorting/vertex.rs
@@ -59,7 +59,7 @@ impl Vertex {
     /// Set the type of the edge going from this vertex to the next in the path.
     #[must_use]
     pub fn with_out_edge_type(mut self, out_edge_type: EdgeType) -> Self {
-        self.out_edge_type = Some(out_edge_type);
+        self.set_out_edge_type(out_edge_type);
         self
     }
 
@@ -72,4 +72,10 @@ impl Vertex {
     pub fn out_edge_type(&self) -> Option<EdgeType> {
         self.out_edge_type
     }
+
+    /// Set the type of the edge going from this vertex to the next in the path.
+    pub fn set_out_edge_type(&mut self, out_edge_type: EdgeType) -> &mut Self {
+        self.out_edge_type = Some(out_edge_type);
+        self
+    }
 }