pagination of rss results

[alxsss]

Hello,

I try to paginate results obtained by using opensearch rss. To do this I need 
totalResults in the rss feed that comes as

<opensearch:totalResults>100</opensearch:totalResults>

However, in php's simple_xml_load file results I do not see this part of the 
feed. Does someone know how to get totalResults from this feed in php 
application?

Thanks in advance.
Alex.