From 8a8006c52196629715ede2e80546e5710319c932 Mon Sep 17 00:00:00 2001
From: Jeff Baskin <jeff.l.baskin@gmail.com>
Date: Sat, 21 Mar 2026 08:50:47 -0400
Subject: [PATCH] Added features to document definition.

---
 src/document.rs            |  5 +++++
 src/document/definition.rs | 32 +++++++++++++++++++++++++++++++-
 2 files changed, 36 insertions(+), 1 deletion(-)

diff --git a/src/document.rs b/src/document.rs
index 5a5c70d..cf03118 100644
--- a/src/document.rs
+++ b/src/document.rs
@@ -13,3 +13,8 @@ pub use definition::{DocDef, DocFuncType};
 pub use field::{Field, FieldType, MissingTranslation};
 pub use record::{Record, Records};
 pub use session::Session;
+
+#[derive(Clone, Debug, Eq, Hash, PartialEq)]
+enum DocFeature {
+    System,
+}
diff --git a/src/document/definition.rs b/src/document/definition.rs
index ef7168b..42cc5fb 100644
--- a/src/document/definition.rs
+++ b/src/document/definition.rs
@@ -1,3 +1,4 @@
+use super::DocFeature;
 use crate::{
     action::{Action, CalcValue, Field, FieldType, MsgAction},
     document::create::IndexType,
@@ -215,6 +216,7 @@ impl PathAction {
 #[derive(Clone, Debug)]
 pub struct DocDef {
     doc_names: Vec<Name>,
+    features: HashSet<DocFeature>,
     field_names: Names,
     fields: HashMap<NameID, FieldSetting>,
     indexes: HashMap<NameID, IndexType>,
@@ -227,7 +229,22 @@ impl DocDef {
         Self::with_names(names)
     }
 
+    pub fn system(name: Name) -> Self {
+        let names = vec![name];
+        Self::system_with_names(names)
+    }
+
+    pub fn system_with_names(names: Vec<Name>) -> Self {
+        let mut features = HashSet::new();
+        features.insert(DocFeature::System);
+        Self::create(names, features)
+    }
+
     pub fn with_names(names: Vec<Name>) -> Self {
+        Self::create(names, HashSet::new())
+    }
+
+    fn create(names: Vec<Name>, features: HashSet<DocFeature>) -> Self {
         let routes = vec![
             PathAction::new(
                 Path::new(
@@ -272,6 +289,7 @@ impl DocDef {
         ];
         Self {
             doc_names: names,
+            features: features,
             field_names: Names::new(),
             fields: HashMap::new(),
             indexes: HashMap::new(),
@@ -406,10 +424,22 @@ mod docdefs {
     use crate::action::{Query, Update};
 
     #[test]
-    fn message_doc_name_returns_none() {
+    fn can_create_document_definition() {
         let docname = Name::english("tester");
         let mut docdef = DocDef::new(docname);
         assert_eq!(docdef.doc_name(), &NameType::None);
+        assert!(
+            docdef.features.is_empty(),
+            "should not have special features"
+        );
+    }
+
+    #[test]
+    fn can_create_system_document_definition() {
+        let docname = Name::english("system");
+        let mut docdef = DocDef::system(docname);
+        assert_eq!(docdef.features.len(), 1);
+        assert_eq!(docdef.features.iter().last().unwrap(), &DocFeature::System);
     }
 
     #[test]