How does Oracle EM support WBEM

How does Oracle Enterprise Manager suport Web Based Enterprise Manager (WBEM) and more specifically Windows Management Instrumentation (WMI). Is there a provider for these?

There are already target-types/integration solutions available for these target-types in Oracle EM. Any reason you are not able to take advantage of the same ?
For web-services, you should find answer to your query in Section 7 of the latest Extensibility guide (10.2.0.5). Also, refer to the section 10 on out-of-box fetchlets (in specific section 10.4 on URL Timing and section 10.10 on OJMX/SOAP fetchlet).
The extensibility guide can be downloaded from here .

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