BaseObject.getDocumentSyntaxId does not work in multiwiki

BeseCollection.getDocumentSyntaxId get the syntax using BaseElement.getName to get the XWikiDocument but BaseElement.getName return the local name of the document and does not contain the wiki name.

One good example is display of a XWiki Syntax 2.0 panels from another wiki. In that case BaseElement.getDocumentSyntaxId will return "xwiki/1.0" because it can't find the document.