2007/6/7, Fabrice Colin <<a href="mailto:fabrice.colin@gmail.com">fabrice.colin@gmail.com</a>>:<div><span class="gmail_quote"></span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> On 6/7/07, Mikkel Kamstrup Erlandsen <<a href="mailto:mikkel.kamstrup@gmail.com">mikkel.kamstrup@gmail.com</a>> wrote:<br>> To ease the query expansion on the servers each Category<br>> will have a property "abstract" that if true implies that objects <br>> can not be assigned to this category. In the standard xesam<br>> spec non-abstract cats are just the leaf nodes of the cat tree<br>><br>Are you sure about this ?<br>Looking at Evgeny's viz.png diagram, I would think some <br>non-leaf categories would be useful, eg Document and Message.</blockquote><div><br>Ok, maybe  .odf et al could go in the Documents cat, but I think Message should be abstract. IM and such would have its own subcat (right Evgeny?). <br><br>Anyway this just goes to show that the Abstract property of the cats is not redundant.<br><br>Cheers,<br>Mikkel<br></div><br></div><br>