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Determine whether a given string is a valid URI. 
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<a class="anchor" name="29f0651ff8a64bc23733a31390682032"></a><!-- doxytag: member="XMLUri::isValidURI" ref="29f0651ff8a64bc23733a31390682032" args="(bool haveBaseURI, const XMLCh *const uriStr, bool bAllowSpaces=false)" -->
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          <td class="memname">static bool XMLUri::isValidURI           </td>
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