The namespace is completely flexible and you can call it anything. It doesn't rely on other things existing somewhere despite the 'url' appearance. It merely serves as a unique name so the document and developer (you) can identify which embedded xml file is being used to connect to the CCs to.

Once the xml file is embedded in the document, the document is completely standalone and doesn't care who else accesses or edits the document. It won't matter that the document is stored on Sharepoint. You won't need to maintain the external xml file and it can be deleted once it has been loaded to the document.

Note that if you paste these mapped CCs into a different document that doesn't contain the xml then the CCs will behave as if they are not mapped.

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Andrew Lockton
Chrysalis Design, Melbourne Australia