When overridden in a derived class, compares the base Uniform Resource Identifiers (URIs) of two documents based upon the order the documents were loaded by the XSLT processor (that is, the System.Xml.Xsl.XslTransform class).
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An integer value describing the relative order of the two base URIs: -1 if baseUri occurs before nextbaseUri; 0 if the two base URIs are identical; and 1 if baseUri occurs after nextbaseUri.
This method supports the XSLT document() function which specifies that nodes selected across multiple documents are always returned in the same order.
The order is implementation-specific.