Processing of <valList>

[peterstadler]

relocating from TEIC/TEI#845

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As per
http://listserv.brown.edu/archives/cgi-bin/wa?A2=ind1003&L=TEI-L&T=0&O=D&P=162
and
http://listserv.brown.edu/archives/cgi-bin/wa?A2=ind1003&L=TEI-L&D=0&O=D&T=0&P=288
Roma exits with a fatal error when processing an ODD where contains unexpected text nodes (i.e., whitespace) instead of just s.

Possible solutions might involve the use of getElementsByTagName('valItem') or
if ($oChild->nodeName=='valItem') { ... }