Update app.py

app.py

@@ -14,6 +14,7 @@ import streamlit.components.v1 as components
 from langchain_community.vectorstores import Chroma
 from langchain.chains import ConversationalRetrievalChain
 from langchain.text_splitter import CharacterTextSplitter
+from langchain_community.document_loaders import UnstructuredXMLLoader
 from langchain.memory import ConversationBufferMemory
 from langchain_community.llms import OpenAI
 from langchain_community.chat_models import ChatOpenAI