Is there a public accessible metadata aggregator?

[Mitch Chang]

Hi,
I am new to the Shibboleth. Currently, I am half way in setting up a VM for Shibboleth IdP. I have got to the point where I have the IdP's metadata generated in idp-metadata.xml, but I need to upload it to some metadata aggregator (or centralized metadata?) I am following the instructions in  Shibboleth Workshop Series - Linux Identity Provider (Centos 6.5) , Step 7. Register your IdP with the administrator's machine for your training session.

Is there such as public accessible metadata aggregator that anyone can use?

Thanks.
Mitch
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