Describe the metadatatool bundle.

tools/metadatatool/README.txt

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+This folder contains all the required resources required to run the
+metadatatool application used in UK federation metadata signature.
+
+This bundle was originally derived from a version of the Shibboleth
+1.3 identity provider software.
+
+Contents:
+
+* The endorsed folder contains specific versions of Xerces and Xalan, and
+should be endorsed for the Java runtime.  Other versions of Xerces and
+Xalan, and in particular the ones built in to versions of the Java runtime,
+are known to give different results with this application.
+
+* The lib folder contains the shib-util.jar containing the implementation of
+metadatatool, along with all required dependencies.
+
+The main class to execute is edu.internet2.middleware.shibboleth.utils.MetadataTool