why SOM of msxml4 can't load this schema?

the schema is:
http://www.web3d.org/specifications/x3d-3.0.xsd

when use SOM to load as:
...
SchemaCache  =  new 
ActiveXObject("Msxml2.XMLSchemaCache.4.0"); 
SchemaCache.add("","x3d-3.0.xsd");
...

pop up a messageBox report that there are some
error.but the schema is
well-formated.how to solution?


titi

_________________________________________________________
Do You Yahoo!? 
繁华世界里，让我看清你
http://cn.rd.yahoo.com/mail_cn/tag/?http://cn.surveys.yahoo.com/cn_user_profile_study_dec2003