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<p style="margin: 10px 0 0 0">As noted in the online discussion, the trick is to appropriately name the files in the filesystem. Since the Metadata Query Protocol has already solved this problem (for better or worse), I'll suggest we not reinvent this wheel if possible.</p>
<p style="margin: 10px 0 0 0">As an example, the following pair of URLs resolve to the same entity descriptor:</p>
<p style="margin: 10px 0 0 0"><a href="http://mdq-beta.incommon.org/global/entities/urn%3Amace%3Aincommon%3Ainternet2.edu" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">http://mdq-beta.incommon.org/global/entities/urn%3Amace%3Aincommon%3Ainternet2.edu</a><br /> <a href="http://mdq-beta.incommon.org/global/entities/%7Bsha1%7Dc58d27e972e66f1f26ad5318b303bca955a56021" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">http://mdq-beta.incommon.org/global/entities/%7Bsha1%7Dc58d27e972e66f1f26ad5318b303bca955a56021</a></p>
<p style="margin: 10px 0 0 0">So, if we start with the following pair of identifiers:</p>
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urn:mace:incommon:internet2.edu
{sha1}c58d27e972e66f1f26ad5318b303bca955a56021
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<p style="margin: 10px 0 0 0">The problem boils down to picking an appropriate encoding for the target filesystems.</p>
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