[WebODF] Highlight a Letter

Dear webODF Developers, I want to use your library to display odt Data and highlight letters in the text using the keyboard. I tried the "getting started" example, with Documents created by OpenOffice or LibreOffice. Only the Documents created by LibreOffice get displayed, the other cause: "loading dataname.odt". How can I solve this problem and display both types of documents? I tried to highlight a word with the method odf.OdfCanvas.getAnnotationViewManager().highlightAnnotation(); but I don't know which object this method needs. Is this the right Method and how can I use it? I need two types of highlights, can I change the highlight color or the type of highlight? Thanks in advance Tabea Schröder