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The documentation assumes you have installed semantic technology patch 7600122. Once you install that patch on 188.8.131.52, sem_apis.ALTER_SEM_INDEX_ON_MODEL will be available for use.
Which indexes are better depends upon the workload: for example, if you SPCM index will allow quicker access via subject.
OK thanks it works fine after applying the patch.
A followup question : what is the difference between the 'C' and the 'O' index. C corresponds to CANON_END_NODE_ID and O to END_NODE_ID, but what are the differences between these 2 things ? when to use one or the other ?
Please see http://download.oracle.com/docs/cd/B28359_01/appdev.111/b28397/sdo_rdf_concepts.htm#CIHEHAAD for more information.