diff --git a/Implab/JSON/JSONXmlReader.cs b/Implab/JSON/JSONXmlReader.cs
--- a/Implab/JSON/JSONXmlReader.cs
+++ b/Implab/JSON/JSONXmlReader.cs
@@ -311,10 +311,26 @@ namespace Implab.JSON {
             return Create(File.OpenText(file), options);
         }
 
+        /// <summary>
+        /// Creates the XmlReader for the specified text stream with JSON data.
+        /// </summary>
+        /// <param name="reader">Text reader.</param>
+        /// <param name="options">Options.</param>
+        /// <remarks>
+        /// The reader will be disposed when the XmlReader is disposed.
+        /// </remarks>
         public static JSONXmlReader Create(TextReader reader,  JSONXmlReaderOptions options) {
             return new JSONXmlReader(new JSONParser(reader, true), options);
         }
 
+        /// <summary>
+        /// Creates the XmlReader for the specified stream with JSON data.
+        /// </summary>
+        /// <param name="stream">Stream.</param>
+        /// <param name="options">Options.</param>
+        /// <remarks>
+        /// The stream will be disposed when the XmlReader is disposed.
+        /// </remarks>
         public static JSONXmlReader Create(Stream stream,  JSONXmlReaderOptions options) {
             Safe.ArgumentNotNull(stream, "stream");
             // HACK don't dispose StreaReader to keep stream opened
diff --git a/Implab/Parsing/Scanner.cs b/Implab/Parsing/Scanner.cs
--- a/Implab/Parsing/Scanner.cs
+++ b/Implab/Parsing/Scanner.cs
@@ -41,7 +41,7 @@ namespace Implab.Parsing {
         int m_chunkSize = 1024; // 1k
         int m_limit = 10 * 1024 * 1024; // 10Mb
 
-        public Scanner(CDFADefinition definition) {
+        protected Scanner(CDFADefinition definition) {
             Safe.ArgumentNotNull(definition, "definition");
 
             m_states = definition.States;