Description:
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xhprof's package.xml file is invalid. This leads to the problem that installers that validate it cannot install the package - pyrus is one of them.

Reproduce code:
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$ wget http://pecl.php.net/get/xhprof-0.9.2.tgz
$ tar xzvf xhprof-0.9.2.tgz
$ xmllint --noout --schema http://pear.php.net/dtd/package-2.0.xsd package.xml

Expected result:
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No output

Actual result:
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package.xml:112: element date: Schemas validity error : Element '{http://pear.php.net/dtd/package-2.0}date': This element is not expected. Expected is ( {http://pear.php.net/dtd/package-2.0}stability ).
package.xml:124: element date: Schemas validity error : Element '{http://pear.php.net/dtd/package-2.0}date': This element is not expected. Expected is ( {http://pear.php.net/dtd/package-2.0}stability ).
package.xml fails to validate