Compare this XHTML document with its HTML counterpart
You should be able to see another paragraph after this one.
You can see this? Good. XML allows the 'object' tag to be closed using the empty-element tag syntax <object ... />. Since this document is XHTML the <object/> tag that comes before this paragraph should close the 'object' element, preventing this paragraph (and the rest of the document) from being treated as alternative content.