Malformed UTF-8 character (fatal) error while parsing XML using XML::LibXML - perl

Question

I am parsing XML files using XML::LibXML. For the following XML entry I get the error:
Malformed UTF-8 character (fatal) at C:/Perl64/site/lib/XML/LibXML/Error.pm line 217
which is
$context=~s/[^\t]/ /g;
The entry in XML is the following
<MedlineCitation Owner="NLM" Status="MEDLINE">
<PMID Version="1">15177811</PMID>
<DateCreated>
<Year>2004</Year>
<Month>06</Month>
<Day>04</Day>
</DateCreated>
<DateCompleted>
<Year>2004</Year>
<Month>08</Month>
<Day>11</Day>
</DateCompleted>
<DateRevised>
<Year>2011</Year>
<Month>04</Month>
<Day>07</Day>
</DateRevised>
<Article PubModel="Print">
<Journal>
<ISSN IssnType="Print">0278-2626</ISSN>
<JournalIssue CitedMedium="Print">
<Volume>55</Volume>
<Issue>2</Issue>
<PubDate>
<Year>2004</Year>
<Month>Jul</Month>
</PubDate>
</JournalIssue>
<Title>Brain and cognition</Title>
<ISOAbbreviation>Brain Cogn</ISOAbbreviation>
</Journal>
<ArticleTitle>Efficiency of orientation channels in the striate cortex for distributed categorization process.</ArticleTitle>
<Pagination>
<MedlinePgn>352-4</MedlinePgn>
</Pagination>
<Affiliation>Cognitive Science Department, Université de Liège, Belgium. mmermillod#ulg.ac.be</Affiliation>
<AuthorList CompleteYN="Y">
<Author ValidYN="Y">
<LastName>Mermillod</LastName>
<ForeName>Martial</ForeName>
<Initials>M</Initials>
</Author>
<Author ValidYN="Y">
<LastName>Chauvin</LastName>
<ForeName>Alan</ForeName>
<Initials>A</Initials>
</Author>
<Author ValidYN="Y">
<LastName>Guyader</LastName>
<ForeName>Nathalie</ForeName>
<Initials>N</Initials>
</Author>
</AuthorList>
<Language>eng</Language>
<PublicationTypeList>
<PublicationType>Journal Article</PublicationType>
</PublicationTypeList>
</Article>
<MedlineJournalInfo>
<Country>United States</Country>
<MedlineTA>Brain Cogn</MedlineTA>
<NlmUniqueID>8218014</NlmUniqueID>
<ISSNLinking>0278-2626</ISSNLinking>
</MedlineJournalInfo>
<CitationSubset>IM</CitationSubset>
<CommentsCorrectionsList>
<CommentsCorrections RefType="ErratumIn">
<RefSource>Brain Cogn. 2005 Jul;58(2):245</RefSource>
</CommentsCorrections>
<CommentsCorrections RefType="RepublishedIn">
<RefSource>Brain Cogn. 2005 Jul;58(2):246-8</RefSource>
<PMID Version="1">16044513</PMID>
</CommentsCorrections>
</CommentsCorrectionsList>
<MeshHeadingList>
<MeshHeading>
<DescriptorName MajorTopicYN="Y">Neural Networks (Computer)</DescriptorName>
</MeshHeading>
<MeshHeading>
<DescriptorName MajorTopicYN="N">Neurons</DescriptorName>
<QualifierName MajorTopicYN="N">physiology</QualifierName>
</MeshHeading>
<MeshHeading>
<DescriptorName MajorTopicYN="N">Orientation</DescriptorName>
<QualifierName MajorTopicYN="Y">physiology</QualifierName>
</MeshHeading>
<MeshHeading>
<DescriptorName MajorTopicYN="N">Pattern Recognition, Visual</DescriptorName>
<QualifierName MajorTopicYN="Y">physiology</QualifierName>
</MeshHeading>
<MeshHeading>
<DescriptorName MajorTopicYN="N">Visual Cortex</DescriptorName>
<QualifierName MajorTopicYN="Y">physiology</QualifierName>
</MeshHeading>
</MeshHeadingList>
</MedlineCitation>
But the things I want out of this entry is PMID, DateRevised, PubDate, ArticleTitle, CommentsCorrectionList, and MeshHeadingList. But, if I remove Affiliation which contains some other character this error is no more. How should I fix this error?

Answer 1

You could either convert the file to the specified encoding (UTF-8), or you can specify the encoding actually used for the file. (<?xml version="1.0" encoding="cp1252"?>).
Notepad can be used to convert to UTF-8, and so can Perl:
perl -pe"
BEGIN {
binmode STDIN, ':encoding(cp1252)';
binmode STDOUT, ':encoding(UTF-8)';
}
" < file.cp1252 > file.UTF-8
(You'll have to remove the line breaks I've added for readability.)