Add support for toc singleton
Add support for toc singleton

katalysteducation/webview,Connexions/webview,Connexions/webview,katalysteducation/webview,dak/webview,carolinelane10/webview,dak/webview,Connexions/webview,Connexions/webview,katalysteducation/webview,katalysteducation/webview,dak/webview