diff --git a/docs/dist/v1/chartifact.markdown.umd.js b/docs/dist/v1/chartifact.markdown.umd.js
index ef28a70b..c8fa689d 100644
--- a/docs/dist/v1/chartifact.markdown.umd.js
+++ b/docs/dist/v1/chartifact.markdown.umd.js
@@ -2905,7 +2905,7 @@ ${reconstitutedRules.join("\n\n")}
     "behavior",
     "-moz-binding"
   ]);
-  function getProperty(data, path, parents = [], logger) {
+  function getProperty(data, path, parents = [], logger, getOuterProperty) {
     if (path === ".") {
       return data;
     }
@@ -2925,6 +2925,9 @@ ${reconstitutedRules.join("\n\n")}
         currentData = parents[parents.length - parentLevels];
         remainingPath = tempPath.startsWith(".") ? tempPath.substring(1) : tempPath;
       } else {
+        if (getOuterProperty) {
+          return getOuterProperty(path, data, parents);
+        }
         return void 0;
       }
     }
@@ -2933,21 +2936,25 @@ ${reconstitutedRules.join("\n\n")}
         logger.error(`Cannot access property "${remainingPath}" on primitive value of type "${typeof currentData}"`);
         return void 0;
       }
-      return remainingPath.split(".").reduce((o, k2) => o && typeof o === "object" && o !== null ? o[k2] : void 0, currentData);
+      const result = remainingPath.split(".").reduce((o, k2) => o && typeof o === "object" && o !== null ? o[k2] : void 0, currentData);
+      if (result === void 0 && getOuterProperty) {
+        return getOuterProperty(path, data, parents);
+      }
+      return result;
     }
     return currentData;
   }
   function escape(s) {
     return s.replace(/[&<>"']/g, (c) => ({ "&": "&amp;", "<": "&lt;", ">": "&gt;", '"': "&quot;", "'": "&#39;" })[c] || c);
   }
-  function interpolate(tpl, data, escapeHtml = true, parents = [], logger) {
+  function interpolate(tpl, data, escapeHtml = true, parents = [], logger, getOuterProperty) {
     return tpl.replace(/\{\{\{([^{]*?)\}\}\}|\{\{([^{]*?)\}\}/g, (match, escapedExpr, normalExpr) => {
       if (escapedExpr !== void 0) {
         const trimmed2 = escapedExpr.trim();
         return `{{${trimmed2}}}`;
       }
       const trimmed = normalExpr.trim();
-      const val = getProperty(data, trimmed, parents, logger);
+      const val = getProperty(data, trimmed, parents, logger, getOuterProperty);
       return val == null ? "" : escapeHtml ? escape(String(val)) : String(val);
     });
   }
@@ -2987,13 +2994,13 @@ ${reconstitutedRules.join("\n\n")}
     }
     return cssDeclarations.join("; ").trim();
   }
-  function processStyleAttribute(value, data, parents, logger) {
+  function processStyleAttribute(value, data, parents, logger, getOuterProperty) {
     if (value !== null && typeof value === "object" && !Array.isArray(value) && "$check" in value && typeof value.$check === "string") {
       const conditional = value;
       if (!validatePathExpression(conditional.$check, "$check", logger)) {
         return "";
       }
-      const checkValue = getProperty(data, conditional.$check, parents);
+      const checkValue = getProperty(data, conditional.$check, parents, logger, getOuterProperty);
       const condition = evaluateCondition(checkValue, conditional);
       const resultValue = condition ? conditional.$then : conditional.$else;
       if (resultValue === void 0) {
@@ -3078,11 +3085,11 @@ ${reconstitutedRules.join("\n\n")}
   function isConditionalValue(value) {
     return value !== null && typeof value === "object" && !Array.isArray(value) && "$check" in value && typeof value.$check === "string";
   }
-  function evaluateConditionalValue(value, data, parents = [], logger) {
+  function evaluateConditionalValue(value, data, parents = [], logger, getOuterProperty) {
     if (!validatePathExpression(value.$check, "$check", logger)) {
       return "";
     }
-    const checkValue = getProperty(data, value.$check, parents);
+    const checkValue = getProperty(data, value.$check, parents, logger, getOuterProperty);
     const condition = evaluateCondition(checkValue, value);
     if (condition) {
       return value.$then !== void 0 ? value.$then : "";
@@ -3110,7 +3117,7 @@ ${reconstitutedRules.join("\n\n")}
     const attrs = rest && typeof rest === "object" && !Array.isArray(rest) ? Object.fromEntries(Object.entries(rest).filter(([k2]) => k2 !== "$children")) : {};
     return { tag, rest, children, attrs };
   }
-  function processConditional(rest, data, parents = [], logger) {
+  function processConditional(rest, data, parents = [], logger, getOuterProperty) {
     const conditional = rest;
     if (!conditional.$check) {
       logger.error('"$if" tag requires $check attribute to specify the condition');
@@ -3119,7 +3126,7 @@ ${reconstitutedRules.join("\n\n")}
     if (!validatePathExpression(conditional.$check, "$check", logger)) {
       return { valueToRender: void 0 };
     }
-    const checkValue = getProperty(data, conditional.$check, parents);
+    const checkValue = getProperty(data, conditional.$check, parents, logger, getOuterProperty);
     if (typeof rest === "object" && rest !== null && !Array.isArray(rest) && "$children" in rest) {
       logger.warn('"$if" tag does not support $children, use $then and $else instead');
     }
@@ -3144,8 +3151,9 @@ ${reconstitutedRules.join("\n\n")}
   function renderToDOM(input, options = {}) {
     const data = input.data;
     const logger = options.logger || console;
+    const getOuterProperty = options.propertyFallback;
     const fragment = document.createDocumentFragment();
-    const result = render(input.template, data, { logger });
+    const result = render(input.template, data, { logger, getOuterProperty });
     if (Array.isArray(result))
       result.forEach((n) => fragment.appendChild(n));
     else
@@ -3155,8 +3163,11 @@ ${reconstitutedRules.join("\n\n")}
   function render(template, data, context) {
     const parents = context.parents || [];
     const logger = context.logger;
-    if (typeof template === "string")
-      return document.createTextNode(interpolate(template, data, true, parents, logger));
+    const getOuterProperty = context.getOuterProperty;
+    if (typeof template === "string") {
+      const shouldEscape = context.insideComment || false;
+      return document.createTextNode(interpolate(template, data, shouldEscape, parents, logger, getOuterProperty));
+    }
     if (Array.isArray(template)) {
       const results = [];
       for (const t of template) {
@@ -3182,7 +3193,7 @@ ${reconstitutedRules.join("\n\n")}
       return [];
     }
     if (tag === "$if") {
-      const { valueToRender } = processConditional(rest, data, parents, logger);
+      const { valueToRender } = processConditional(rest, data, parents, logger, getOuterProperty);
       if (valueToRender === void 0) {
         return [];
       }
@@ -3213,9 +3224,9 @@ ${reconstitutedRules.join("\n\n")}
       if (!validatePathExpression(rest.$bind, "$bind", logger)) {
         return [];
       }
-      const bound = getProperty(data, rest.$bind, [], logger);
+      const bound = getProperty(data, rest.$bind, [], logger, getOuterProperty);
       const { $bind, $children = [], ...bindAttrs } = rest;
-      setAttrs(element, bindAttrs, data, tag, parents, logger);
+      setAttrs(element, bindAttrs, data, tag, parents, logger, getOuterProperty);
       if (isVoid && $children.length > 0) {
         logger.warn(`Tag "${tag}" is a void element and cannot have children`);
       }
@@ -3245,7 +3256,7 @@ ${reconstitutedRules.join("\n\n")}
       const childNodes = render({ [tag]: { ...bindAttrs, $children } }, boundData, { ...context, parents: newParents });
       return Array.isArray(childNodes) ? childNodes : [childNodes];
     }
-    setAttrs(element, attrs, data, tag, parents, logger);
+    setAttrs(element, attrs, data, tag, parents, logger, getOuterProperty);
     if (!isVoid) {
       for (const c of children) {
         const nodes = render(c, data, context);
@@ -3259,23 +3270,23 @@ ${reconstitutedRules.join("\n\n")}
     }
     return element;
   }
-  function setAttrs(element, attrs, data, tag, parents = [], logger) {
+  function setAttrs(element, attrs, data, tag, parents = [], logger, getOuterProperty) {
     Object.entries(attrs).forEach(([key, value]) => {
       if (!validateAttribute(key, tag, logger)) {
         return;
       }
       let attrValue;
       if (key === "style") {
-        attrValue = processStyleAttribute(value, data, parents, logger);
+        attrValue = processStyleAttribute(value, data, parents, logger, getOuterProperty);
         if (!attrValue) {
           return;
         }
       } else {
         if (isConditionalValue(value)) {
-          const evaluatedValue = evaluateConditionalValue(value, data, parents, logger);
-          attrValue = interpolate(String(evaluatedValue), data, false, parents, logger);
+          const evaluatedValue = evaluateConditionalValue(value, data, parents, logger, getOuterProperty);
+          attrValue = interpolate(String(evaluatedValue), data, false, parents, logger, getOuterProperty);
         } else {
-          attrValue = interpolate(String(value), data, false, parents, logger);
+          attrValue = interpolate(String(value), data, false, parents, logger, getOuterProperty);
         }
       }
       element.setAttribute(key, attrValue);
diff --git a/docs/schema/idoc_v1.json b/docs/schema/idoc_v1.json
index c93a9361..1132bcae 100644
--- a/docs/schema/idoc_v1.json
+++ b/docs/schema/idoc_v1.json
@@ -8,13 +8,13 @@
         "a": {
           "anyOf": [
             {
-              "type": "string"
+              "$ref": "#/definitions/InterpolatedString"
             },
             {
               "items": {
                 "anyOf": [
                   {
-                    "type": "string"
+                    "$ref": "#/definitions/InterpolatedString"
                   },
                   {
                     "$ref": "#/definitions/TemplateObject"
@@ -29,13 +29,13 @@
               },
               "properties": {
                 "$bind": {
-                  "type": "string"
+                  "$ref": "#/definitions/BindPath"
                 },
                 "$children": {
                   "items": {
                     "anyOf": [
                       {
-                        "type": "string"
+                        "$ref": "#/definitions/InterpolatedString"
                       },
                       {
                         "$ref": "#/definitions/TemplateObject"
@@ -195,13 +195,13 @@
         "article": {
           "anyOf": [
             {
-              "type": "string"
+              "$ref": "#/definitions/InterpolatedString"
             },
             {
               "items": {
                 "anyOf": [
                   {
-                    "type": "string"
+                    "$ref": "#/definitions/InterpolatedString"
                   },
                   {
                     "$ref": "#/definitions/TemplateObject"
@@ -216,13 +216,13 @@
               },
               "properties": {
                 "$bind": {
-                  "type": "string"
+                  "$ref": "#/definitions/BindPath"
                 },
                 "$children": {
                   "items": {
                     "anyOf": [
                       {
-                        "type": "string"
+                        "$ref": "#/definitions/InterpolatedString"
                       },
                       {
                         "$ref": "#/definitions/TemplateObject"
@@ -260,7 +260,7 @@
     "AttributeValue": {
       "anyOf": [
         {
-          "type": "string"
+          "$ref": "#/definitions/InterpolatedString"
         },
         {
           "$ref": "#/definitions/ConditionalValue"
@@ -340,19 +340,22 @@
       ],
       "type": "object"
     },
+    "BindPath": {
+      "type": "string"
+    },
     "BlockquoteTag": {
       "additionalProperties": false,
       "properties": {
         "blockquote": {
           "anyOf": [
             {
-              "type": "string"
+              "$ref": "#/definitions/InterpolatedString"
             },
             {
               "items": {
                 "anyOf": [
                   {
-                    "type": "string"
+                    "$ref": "#/definitions/InterpolatedString"
                   },
                   {
                     "$ref": "#/definitions/TemplateObject"
@@ -367,13 +370,13 @@
               },
               "properties": {
                 "$bind": {
-                  "type": "string"
+                  "$ref": "#/definitions/BindPath"
                 },
                 "$children": {
                   "items": {
                     "anyOf": [
                       {
-                        "type": "string"
+                        "$ref": "#/definitions/InterpolatedString"
                       },
                       {
                         "$ref": "#/definitions/TemplateObject"
@@ -417,13 +420,13 @@
         "br": {
           "anyOf": [
             {
-              "type": "string"
+              "$ref": "#/definitions/InterpolatedString"
             },
             {
               "items": {
                 "anyOf": [
                   {
-                    "type": "string"
+                    "$ref": "#/definitions/InterpolatedString"
                   },
                   {
                     "$ref": "#/definitions/TemplateObject"
@@ -438,7 +441,7 @@
               },
               "properties": {
                 "$bind": {
-                  "type": "string"
+                  "$ref": "#/definitions/BindPath"
                 },
                 "class": {
                   "$ref": "#/definitions/AttributeValue"
@@ -529,13 +532,13 @@
         "code": {
           "anyOf": [
             {
-              "type": "string"
+              "$ref": "#/definitions/InterpolatedString"
             },
             {
               "items": {
                 "anyOf": [
                   {
-                    "type": "string"
+                    "$ref": "#/definitions/InterpolatedString"
                   },
                   {
                     "$ref": "#/definitions/TemplateObject"
@@ -550,13 +553,13 @@
               },
               "properties": {
                 "$bind": {
-                  "type": "string"
+                  "$ref": "#/definitions/BindPath"
                 },
                 "$children": {
                   "items": {
                     "anyOf": [
                       {
-                        "type": "string"
+                        "$ref": "#/definitions/InterpolatedString"
                       },
                       {
                         "$ref": "#/definitions/TemplateObject"
@@ -614,13 +617,13 @@
         "$comment": {
           "anyOf": [
             {
-              "type": "string"
+              "$ref": "#/definitions/InterpolatedString"
             },
             {
               "items": {
                 "anyOf": [
                   {
-                    "type": "string"
+                    "$ref": "#/definitions/InterpolatedString"
                   },
                   {
                     "$ref": "#/definitions/TemplateObject"
@@ -635,13 +638,13 @@
               },
               "properties": {
                 "$bind": {
-                  "type": "string"
+                  "$ref": "#/definitions/BindPath"
                 },
                 "$children": {
                   "items": {
                     "anyOf": [
                       {
-                        "type": "string"
+                        "$ref": "#/definitions/InterpolatedString"
                       },
                       {
                         "$ref": "#/definitions/TemplateObject"
@@ -730,7 +733,7 @@
         }
       ]
     },
-    "ConditionalBase<(string|TemplateObject)>": {
+    "ConditionalBase<(InterpolatedString|TemplateObject)>": {
       "additionalProperties": false,
       "properties": {
         "$<": {
@@ -749,12 +752,12 @@
           "type": "number"
         },
         "$check": {
-          "type": "string"
+          "$ref": "#/definitions/BindPath"
         },
         "$else": {
           "anyOf": [
             {
-              "type": "string"
+              "$ref": "#/definitions/InterpolatedString"
             },
             {
               "$ref": "#/definitions/TemplateObject"
@@ -780,7 +783,7 @@
         "$then": {
           "anyOf": [
             {
-              "type": "string"
+              "$ref": "#/definitions/InterpolatedString"
             },
             {
               "$ref": "#/definitions/TemplateObject"
@@ -813,7 +816,7 @@
           "type": "number"
         },
         "$check": {
-          "type": "string"
+          "$ref": "#/definitions/BindPath"
         },
         "$else": {
           "$ref": "#/definitions/CSSProperties"
@@ -844,7 +847,7 @@
       ],
       "type": "object"
     },
-    "ConditionalBase<string>": {
+    "ConditionalBase<InterpolatedString>": {
       "additionalProperties": false,
       "properties": {
         "$<": {
@@ -863,10 +866,10 @@
           "type": "number"
         },
         "$check": {
-          "type": "string"
+          "$ref": "#/definitions/BindPath"
         },
         "$else": {
-          "type": "string"
+          "$ref": "#/definitions/InterpolatedString"
         },
         "$in": {
           "items": {
@@ -885,7 +888,7 @@
           "type": "boolean"
         },
         "$then": {
-          "type": "string"
+          "$ref": "#/definitions/InterpolatedString"
         }
       },
       "required": [
@@ -895,10 +898,10 @@
       "type": "object"
     },
     "ConditionalValue": {
-      "$ref": "#/definitions/ConditionalBase%3Cstring%3E"
+      "$ref": "#/definitions/ConditionalBase%3CInterpolatedString%3E"
     },
     "ConditionalValueOrTemplate": {
-      "$ref": "#/definitions/ConditionalBase%3C(string%7CTemplateObject)%3E"
+      "$ref": "#/definitions/ConditionalBase%3C(InterpolatedString%7CTemplateObject)%3E"
     },
     "ContourTransform": {
       "anyOf": [
@@ -1478,13 +1481,13 @@
         "div": {
           "anyOf": [
             {
-              "type": "string"
+              "$ref": "#/definitions/InterpolatedString"
             },
             {
               "items": {
                 "anyOf": [
                   {
-                    "type": "string"
+                    "$ref": "#/definitions/InterpolatedString"
                   },
                   {
                     "$ref": "#/definitions/TemplateObject"
@@ -1499,13 +1502,13 @@
               },
               "properties": {
                 "$bind": {
-                  "type": "string"
+                  "$ref": "#/definitions/BindPath"
                 },
                 "$children": {
                   "items": {
                     "anyOf": [
                       {
-                        "type": "string"
+                        "$ref": "#/definitions/InterpolatedString"
                       },
                       {
                         "$ref": "#/definitions/TemplateObject"
@@ -1658,13 +1661,13 @@
         "em": {
           "anyOf": [
             {
-              "type": "string"
+              "$ref": "#/definitions/InterpolatedString"
             },
             {
               "items": {
                 "anyOf": [
                   {
-                    "type": "string"
+                    "$ref": "#/definitions/InterpolatedString"
                   },
                   {
                     "$ref": "#/definitions/TemplateObject"
@@ -1679,13 +1682,13 @@
               },
               "properties": {
                 "$bind": {
-                  "type": "string"
+                  "$ref": "#/definitions/BindPath"
                 },
                 "$children": {
                   "items": {
                     "anyOf": [
                       {
-                        "type": "string"
+                        "$ref": "#/definitions/InterpolatedString"
                       },
                       {
                         "$ref": "#/definitions/TemplateObject"
@@ -1879,13 +1882,13 @@
         "footer": {
           "anyOf": [
             {
-              "type": "string"
+              "$ref": "#/definitions/InterpolatedString"
             },
             {
               "items": {
                 "anyOf": [
                   {
-                    "type": "string"
+                    "$ref": "#/definitions/InterpolatedString"
                   },
                   {
                     "$ref": "#/definitions/TemplateObject"
@@ -1900,13 +1903,13 @@
               },
               "properties": {
                 "$bind": {
-                  "type": "string"
+                  "$ref": "#/definitions/BindPath"
                 },
                 "$children": {
                   "items": {
                     "anyOf": [
                       {
-                        "type": "string"
+                        "$ref": "#/definitions/InterpolatedString"
                       },
                       {
                         "$ref": "#/definitions/TemplateObject"
@@ -2397,13 +2400,13 @@
         "h1": {
           "anyOf": [
             {
-              "type": "string"
+              "$ref": "#/definitions/InterpolatedString"
             },
             {
               "items": {
                 "anyOf": [
                   {
-                    "type": "string"
+                    "$ref": "#/definitions/InterpolatedString"
                   },
                   {
                     "$ref": "#/definitions/TemplateObject"
@@ -2418,13 +2421,13 @@
               },
               "properties": {
                 "$bind": {
-                  "type": "string"
+                  "$ref": "#/definitions/BindPath"
                 },
                 "$children": {
                   "items": {
                     "anyOf": [
                       {
-                        "type": "string"
+                        "$ref": "#/definitions/InterpolatedString"
                       },
                       {
                         "$ref": "#/definitions/TemplateObject"
@@ -2465,13 +2468,13 @@
         "h2": {
           "anyOf": [
             {
-              "type": "string"
+              "$ref": "#/definitions/InterpolatedString"
             },
             {
               "items": {
                 "anyOf": [
                   {
-                    "type": "string"
+                    "$ref": "#/definitions/InterpolatedString"
                   },
                   {
                     "$ref": "#/definitions/TemplateObject"
@@ -2486,13 +2489,13 @@
               },
               "properties": {
                 "$bind": {
-                  "type": "string"
+                  "$ref": "#/definitions/BindPath"
                 },
                 "$children": {
                   "items": {
                     "anyOf": [
                       {
-                        "type": "string"
+                        "$ref": "#/definitions/InterpolatedString"
                       },
                       {
                         "$ref": "#/definitions/TemplateObject"
@@ -2533,13 +2536,13 @@
         "h3": {
           "anyOf": [
             {
-              "type": "string"
+              "$ref": "#/definitions/InterpolatedString"
             },
             {
               "items": {
                 "anyOf": [
                   {
-                    "type": "string"
+                    "$ref": "#/definitions/InterpolatedString"
                   },
                   {
                     "$ref": "#/definitions/TemplateObject"
@@ -2554,13 +2557,13 @@
               },
               "properties": {
                 "$bind": {
-                  "type": "string"
+                  "$ref": "#/definitions/BindPath"
                 },
                 "$children": {
                   "items": {
                     "anyOf": [
                       {
-                        "type": "string"
+                        "$ref": "#/definitions/InterpolatedString"
                       },
                       {
                         "$ref": "#/definitions/TemplateObject"
@@ -2601,13 +2604,13 @@
         "h4": {
           "anyOf": [
             {
-              "type": "string"
+              "$ref": "#/definitions/InterpolatedString"
             },
             {
               "items": {
                 "anyOf": [
                   {
-                    "type": "string"
+                    "$ref": "#/definitions/InterpolatedString"
                   },
                   {
                     "$ref": "#/definitions/TemplateObject"
@@ -2622,13 +2625,13 @@
               },
               "properties": {
                 "$bind": {
-                  "type": "string"
+                  "$ref": "#/definitions/BindPath"
                 },
                 "$children": {
                   "items": {
                     "anyOf": [
                       {
-                        "type": "string"
+                        "$ref": "#/definitions/InterpolatedString"
                       },
                       {
                         "$ref": "#/definitions/TemplateObject"
@@ -2669,13 +2672,13 @@
         "h5": {
           "anyOf": [
             {
-              "type": "string"
+              "$ref": "#/definitions/InterpolatedString"
             },
             {
               "items": {
                 "anyOf": [
                   {
-                    "type": "string"
+                    "$ref": "#/definitions/InterpolatedString"
                   },
                   {
                     "$ref": "#/definitions/TemplateObject"
@@ -2690,13 +2693,13 @@
               },
               "properties": {
                 "$bind": {
-                  "type": "string"
+                  "$ref": "#/definitions/BindPath"
                 },
                 "$children": {
                   "items": {
                     "anyOf": [
                       {
-                        "type": "string"
+                        "$ref": "#/definitions/InterpolatedString"
                       },
                       {
                         "$ref": "#/definitions/TemplateObject"
@@ -2737,13 +2740,13 @@
         "h6": {
           "anyOf": [
             {
-              "type": "string"
+              "$ref": "#/definitions/InterpolatedString"
             },
             {
               "items": {
                 "anyOf": [
                   {
-                    "type": "string"
+                    "$ref": "#/definitions/InterpolatedString"
                   },
                   {
                     "$ref": "#/definitions/TemplateObject"
@@ -2758,13 +2761,13 @@
               },
               "properties": {
                 "$bind": {
-                  "type": "string"
+                  "$ref": "#/definitions/BindPath"
                 },
                 "$children": {
                   "items": {
                     "anyOf": [
                       {
-                        "type": "string"
+                        "$ref": "#/definitions/InterpolatedString"
                       },
                       {
                         "$ref": "#/definitions/TemplateObject"
@@ -2805,13 +2808,13 @@
         "header": {
           "anyOf": [
             {
-              "type": "string"
+              "$ref": "#/definitions/InterpolatedString"
             },
             {
               "items": {
                 "anyOf": [
                   {
-                    "type": "string"
+                    "$ref": "#/definitions/InterpolatedString"
                   },
                   {
                     "$ref": "#/definitions/TemplateObject"
@@ -2826,13 +2829,13 @@
               },
               "properties": {
                 "$bind": {
-                  "type": "string"
+                  "$ref": "#/definitions/BindPath"
                 },
                 "$children": {
                   "items": {
                     "anyOf": [
                       {
-                        "type": "string"
+                        "$ref": "#/definitions/InterpolatedString"
                       },
                       {
                         "$ref": "#/definitions/TemplateObject"
@@ -2926,13 +2929,13 @@
         "hr": {
           "anyOf": [
             {
-              "type": "string"
+              "$ref": "#/definitions/InterpolatedString"
             },
             {
               "items": {
                 "anyOf": [
                   {
-                    "type": "string"
+                    "$ref": "#/definitions/InterpolatedString"
                   },
                   {
                     "$ref": "#/definitions/TemplateObject"
@@ -2947,7 +2950,7 @@
               },
               "properties": {
                 "$bind": {
-                  "type": "string"
+                  "$ref": "#/definitions/BindPath"
                 },
                 "class": {
                   "$ref": "#/definitions/AttributeValue"
@@ -3037,13 +3040,13 @@
         "img": {
           "anyOf": [
             {
-              "type": "string"
+              "$ref": "#/definitions/InterpolatedString"
             },
             {
               "items": {
                 "anyOf": [
                   {
-                    "type": "string"
+                    "$ref": "#/definitions/InterpolatedString"
                   },
                   {
                     "$ref": "#/definitions/TemplateObject"
@@ -3058,7 +3061,7 @@
               },
               "properties": {
                 "$bind": {
-                  "type": "string"
+                  "$ref": "#/definitions/BindPath"
                 },
                 "alt": {
                   "type": "string"
@@ -3240,6 +3243,9 @@
       ],
       "description": "Union type for all possible interactive elements"
     },
+    "InterpolatedString": {
+      "type": "string"
+    },
     "IsocontourTransform": {
       "additionalProperties": false,
       "properties": {
@@ -3594,13 +3600,13 @@
         "li": {
           "anyOf": [
             {
-              "type": "string"
+              "$ref": "#/definitions/InterpolatedString"
             },
             {
               "items": {
                 "anyOf": [
                   {
-                    "type": "string"
+                    "$ref": "#/definitions/InterpolatedString"
                   },
                   {
                     "$ref": "#/definitions/TemplateObject"
@@ -3615,13 +3621,13 @@
               },
               "properties": {
                 "$bind": {
-                  "type": "string"
+                  "$ref": "#/definitions/BindPath"
                 },
                 "$children": {
                   "items": {
                     "anyOf": [
                       {
-                        "type": "string"
+                        "$ref": "#/definitions/InterpolatedString"
                       },
                       {
                         "$ref": "#/definitions/TemplateObject"
@@ -3795,13 +3801,13 @@
         "main": {
           "anyOf": [
             {
-              "type": "string"
+              "$ref": "#/definitions/InterpolatedString"
             },
             {
               "items": {
                 "anyOf": [
                   {
-                    "type": "string"
+                    "$ref": "#/definitions/InterpolatedString"
                   },
                   {
                     "$ref": "#/definitions/TemplateObject"
@@ -3816,13 +3822,13 @@
               },
               "properties": {
                 "$bind": {
-                  "type": "string"
+                  "$ref": "#/definitions/BindPath"
                 },
                 "$children": {
                   "items": {
                     "anyOf": [
                       {
-                        "type": "string"
+                        "$ref": "#/definitions/InterpolatedString"
                       },
                       {
                         "$ref": "#/definitions/TemplateObject"
@@ -3970,13 +3976,13 @@
         "ol": {
           "anyOf": [
             {
-              "type": "string"
+              "$ref": "#/definitions/InterpolatedString"
             },
             {
               "items": {
                 "anyOf": [
                   {
-                    "type": "string"
+                    "$ref": "#/definitions/InterpolatedString"
                   },
                   {
                     "$ref": "#/definitions/TemplateObject"
@@ -3991,13 +3997,13 @@
               },
               "properties": {
                 "$bind": {
-                  "type": "string"
+                  "$ref": "#/definitions/BindPath"
                 },
                 "$children": {
                   "items": {
                     "anyOf": [
                       {
-                        "type": "string"
+                        "$ref": "#/definitions/InterpolatedString"
                       },
                       {
                         "$ref": "#/definitions/TemplateObject"
@@ -4038,13 +4044,13 @@
         "p": {
           "anyOf": [
             {
-              "type": "string"
+              "$ref": "#/definitions/InterpolatedString"
             },
             {
               "items": {
                 "anyOf": [
                   {
-                    "type": "string"
+                    "$ref": "#/definitions/InterpolatedString"
                   },
                   {
                     "$ref": "#/definitions/TemplateObject"
@@ -4059,13 +4065,13 @@
               },
               "properties": {
                 "$bind": {
-                  "type": "string"
+                  "$ref": "#/definitions/BindPath"
                 },
                 "$children": {
                   "items": {
                     "anyOf": [
                       {
-                        "type": "string"
+                        "$ref": "#/definitions/InterpolatedString"
                       },
                       {
                         "$ref": "#/definitions/TemplateObject"
@@ -4276,13 +4282,13 @@
         "pre": {
           "anyOf": [
             {
-              "type": "string"
+              "$ref": "#/definitions/InterpolatedString"
             },
             {
               "items": {
                 "anyOf": [
                   {
-                    "type": "string"
+                    "$ref": "#/definitions/InterpolatedString"
                   },
                   {
                     "$ref": "#/definitions/TemplateObject"
@@ -4297,13 +4303,13 @@
               },
               "properties": {
                 "$bind": {
-                  "type": "string"
+                  "$ref": "#/definitions/BindPath"
                 },
                 "$children": {
                   "items": {
                     "anyOf": [
                       {
-                        "type": "string"
+                        "$ref": "#/definitions/InterpolatedString"
                       },
                       {
                         "$ref": "#/definitions/TemplateObject"
@@ -4669,13 +4675,13 @@
         "section": {
           "anyOf": [
             {
-              "type": "string"
+              "$ref": "#/definitions/InterpolatedString"
             },
             {
               "items": {
                 "anyOf": [
                   {
-                    "type": "string"
+                    "$ref": "#/definitions/InterpolatedString"
                   },
                   {
                     "$ref": "#/definitions/TemplateObject"
@@ -4690,13 +4696,13 @@
               },
               "properties": {
                 "$bind": {
-                  "type": "string"
+                  "$ref": "#/definitions/BindPath"
                 },
                 "$children": {
                   "items": {
                     "anyOf": [
                       {
-                        "type": "string"
+                        "$ref": "#/definitions/InterpolatedString"
                       },
                       {
                         "$ref": "#/definitions/TemplateObject"
@@ -4808,13 +4814,13 @@
         "span": {
           "anyOf": [
             {
-              "type": "string"
+              "$ref": "#/definitions/InterpolatedString"
             },
             {
               "items": {
                 "anyOf": [
                   {
-                    "type": "string"
+                    "$ref": "#/definitions/InterpolatedString"
                   },
                   {
                     "$ref": "#/definitions/TemplateObject"
@@ -4829,13 +4835,13 @@
               },
               "properties": {
                 "$bind": {
-                  "type": "string"
+                  "$ref": "#/definitions/BindPath"
                 },
                 "$children": {
                   "items": {
                     "anyOf": [
                       {
-                        "type": "string"
+                        "$ref": "#/definitions/InterpolatedString"
                       },
                       {
                         "$ref": "#/definitions/TemplateObject"
@@ -4936,13 +4942,13 @@
         "strong": {
           "anyOf": [
             {
-              "type": "string"
+              "$ref": "#/definitions/InterpolatedString"
             },
             {
               "items": {
                 "anyOf": [
                   {
-                    "type": "string"
+                    "$ref": "#/definitions/InterpolatedString"
                   },
                   {
                     "$ref": "#/definitions/TemplateObject"
@@ -4957,13 +4963,13 @@
               },
               "properties": {
                 "$bind": {
-                  "type": "string"
+                  "$ref": "#/definitions/BindPath"
                 },
                 "$children": {
                   "items": {
                     "anyOf": [
                       {
-                        "type": "string"
+                        "$ref": "#/definitions/InterpolatedString"
                       },
                       {
                         "$ref": "#/definitions/TemplateObject"
@@ -5014,13 +5020,13 @@
         "table": {
           "anyOf": [
             {
-              "type": "string"
+              "$ref": "#/definitions/InterpolatedString"
             },
             {
               "items": {
                 "anyOf": [
                   {
-                    "type": "string"
+                    "$ref": "#/definitions/InterpolatedString"
                   },
                   {
                     "$ref": "#/definitions/TemplateObject"
@@ -5035,13 +5041,13 @@
               },
               "properties": {
                 "$bind": {
-                  "type": "string"
+                  "$ref": "#/definitions/BindPath"
                 },
                 "$children": {
                   "items": {
                     "anyOf": [
                       {
-                        "type": "string"
+                        "$ref": "#/definitions/InterpolatedString"
                       },
                       {
                         "$ref": "#/definitions/TemplateObject"
@@ -5118,13 +5124,13 @@
         "tbody": {
           "anyOf": [
             {
-              "type": "string"
+              "$ref": "#/definitions/InterpolatedString"
             },
             {
               "items": {
                 "anyOf": [
                   {
-                    "type": "string"
+                    "$ref": "#/definitions/InterpolatedString"
                   },
                   {
                     "$ref": "#/definitions/TemplateObject"
@@ -5139,13 +5145,13 @@
               },
               "properties": {
                 "$bind": {
-                  "type": "string"
+                  "$ref": "#/definitions/BindPath"
                 },
                 "$children": {
                   "items": {
                     "anyOf": [
                       {
-                        "type": "string"
+                        "$ref": "#/definitions/InterpolatedString"
                       },
                       {
                         "$ref": "#/definitions/TemplateObject"
@@ -5186,13 +5192,13 @@
         "td": {
           "anyOf": [
             {
-              "type": "string"
+              "$ref": "#/definitions/InterpolatedString"
             },
             {
               "items": {
                 "anyOf": [
                   {
-                    "type": "string"
+                    "$ref": "#/definitions/InterpolatedString"
                   },
                   {
                     "$ref": "#/definitions/TemplateObject"
@@ -5207,13 +5213,13 @@
               },
               "properties": {
                 "$bind": {
-                  "type": "string"
+                  "$ref": "#/definitions/BindPath"
                 },
                 "$children": {
                   "items": {
                     "anyOf": [
                       {
-                        "type": "string"
+                        "$ref": "#/definitions/InterpolatedString"
                       },
                       {
                         "$ref": "#/definitions/TemplateObject"
@@ -5260,7 +5266,7 @@
     "TemplateElement": {
       "anyOf": [
         {
-          "type": "string"
+          "$ref": "#/definitions/InterpolatedString"
         },
         {
           "$ref": "#/definitions/TemplateObject"
@@ -5315,13 +5321,13 @@
         "th": {
           "anyOf": [
             {
-              "type": "string"
+              "$ref": "#/definitions/InterpolatedString"
             },
             {
               "items": {
                 "anyOf": [
                   {
-                    "type": "string"
+                    "$ref": "#/definitions/InterpolatedString"
                   },
                   {
                     "$ref": "#/definitions/TemplateObject"
@@ -5336,13 +5342,13 @@
               },
               "properties": {
                 "$bind": {
-                  "type": "string"
+                  "$ref": "#/definitions/BindPath"
                 },
                 "$children": {
                   "items": {
                     "anyOf": [
                       {
-                        "type": "string"
+                        "$ref": "#/definitions/InterpolatedString"
                       },
                       {
                         "$ref": "#/definitions/TemplateObject"
@@ -5392,13 +5398,13 @@
         "thead": {
           "anyOf": [
             {
-              "type": "string"
+              "$ref": "#/definitions/InterpolatedString"
             },
             {
               "items": {
                 "anyOf": [
                   {
-                    "type": "string"
+                    "$ref": "#/definitions/InterpolatedString"
                   },
                   {
                     "$ref": "#/definitions/TemplateObject"
@@ -5413,13 +5419,13 @@
               },
               "properties": {
                 "$bind": {
-                  "type": "string"
+                  "$ref": "#/definitions/BindPath"
                 },
                 "$children": {
                   "items": {
                     "anyOf": [
                       {
-                        "type": "string"
+                        "$ref": "#/definitions/InterpolatedString"
                       },
                       {
                         "$ref": "#/definitions/TemplateObject"
@@ -5521,13 +5527,13 @@
         "tr": {
           "anyOf": [
             {
-              "type": "string"
+              "$ref": "#/definitions/InterpolatedString"
             },
             {
               "items": {
                 "anyOf": [
                   {
-                    "type": "string"
+                    "$ref": "#/definitions/InterpolatedString"
                   },
                   {
                     "$ref": "#/definitions/TemplateObject"
@@ -5542,13 +5548,13 @@
               },
               "properties": {
                 "$bind": {
-                  "type": "string"
+                  "$ref": "#/definitions/BindPath"
                 },
                 "$children": {
                   "items": {
                     "anyOf": [
                       {
-                        "type": "string"
+                        "$ref": "#/definitions/InterpolatedString"
                       },
                       {
                         "$ref": "#/definitions/TemplateObject"
@@ -5899,13 +5905,13 @@
         "ul": {
           "anyOf": [
             {
-              "type": "string"
+              "$ref": "#/definitions/InterpolatedString"
             },
             {
               "items": {
                 "anyOf": [
                   {
-                    "type": "string"
+                    "$ref": "#/definitions/InterpolatedString"
                   },
                   {
                     "$ref": "#/definitions/TemplateObject"
@@ -5920,13 +5926,13 @@
               },
               "properties": {
                 "$bind": {
-                  "type": "string"
+                  "$ref": "#/definitions/BindPath"
                 },
                 "$children": {
                   "items": {
                     "anyOf": [
                       {
-                        "type": "string"
+                        "$ref": "#/definitions/InterpolatedString"
                       },
                       {
                         "$ref": "#/definitions/TemplateObject"
diff --git a/package-lock.json b/package-lock.json
index c1521a19..0e6cc7c1 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -17,7 +17,7 @@
         "fflate": "^0.8.2",
         "markdown-it": "^14.1.0",
         "tabulator-tables": "^6.3.1",
-        "treebark": "^2.0.6",
+        "treebark": "^2.0.12",
         "vega": "^6.2.0",
         "vega-lite": "^6.4.1"
       },
@@ -13714,9 +13714,9 @@
       }
     },
     "node_modules/treebark": {
-      "version": "2.0.6",
-      "resolved": "https://registry.npmjs.org/treebark/-/treebark-2.0.6.tgz",
-      "integrity": "sha512-qSuP3aaUPSaH2DCVAvIuVZBDznTPfIGLvgr3DEFs837cpLDKmZspJ9WOSMA+s21/v5rlUyu5VnFCDIxokYvnTw==",
+      "version": "2.0.12",
+      "resolved": "https://registry.npmjs.org/treebark/-/treebark-2.0.12.tgz",
+      "integrity": "sha512-Mg8jT6BVQtRTUSMnP9Cw3sCSkixoc9VyYaLFNAQ2ll5jPw+iLcofjV2T2m0Wmu8frQwaRk3UbL3XWi82GesZng==",
       "license": "MIT",
       "engines": {
         "node": ">=16.0.0"
diff --git a/package.json b/package.json
index 037a1d88..c9179006 100644
--- a/package.json
+++ b/package.json
@@ -63,7 +63,7 @@
     "fflate": "^0.8.2",
     "markdown-it": "^14.1.0",
     "tabulator-tables": "^6.3.1",
-    "treebark": "^2.0.6",
+    "treebark": "^2.0.12",
     "vega": "^6.2.0",
     "vega-lite": "^6.4.1"
   }