Validating XML in Perl with libxml and an XSD file

Question

I am trying to have my perl script get an Xxml file from online and validate it according to an XSD file.

The code to do this is as follows:

my $url = shift @ARGV;
my $response = $ua->get($url) || die "Can't fetch file";
my $file = $response->content;

my $schema_file = "schema.xsd";
my $schema = XML::LibXML::Schema->new(location => $schema_file);
my $parser = XML::LibXML->new;
my $doc    = $parser->parse_string($file);
eval { $schema->validate($doc) };
die $@ if $@;

Running this results in a cryptic error: "Element cropdata content check failure" (cropdata is the first of my nonroot tags).

In my XSD file, the entry looks like:

<xs:element name="cropdata">
<xs:complexType>
<xs:sequence>

Then a bunch of "<xs:element..../>" and then:

</xs:sequence>
</xs:complexType>
</xs:element>

Going into the perl debugger shows that after letting the line "my $doc = $parser->parse_string($file);" run, $doc prints as XML::LibXML::Document=SCALAR(0x6b99f0).

Can anyone help me shed light on what I am doing wrong? (Warning: it may be a dumb mistake, I wouldn't put it past myself).

Try use Data::Dumper; Dumper($doc); right after the parse_string call -- does the $doc object look correct? — Ether
– Ether, Commented Aug 3, 2010 at 18:25
@Ether, $doc will almost certainly be a scalar ref to a number that is the memory address of a C data structure. — Ven'Tatsu
– Ven'Tatsu, Commented Aug 3, 2010 at 20:27
What does the input XML look like? Is it valid per the schema? — Jim Garrison
– Jim Garrison, Commented Aug 4, 2010 at 2:31
Oh my god, thank you Jim. Turns out that the sample xml file I had been provided was invalid, and lo and behold, upon checking and correcting it in xmllint, everything works. — Gnats
– Gnats, Commented Aug 4, 2010 at 16:03
Could you post this as an answer and accept it please (that way the question won't show as "unanswered", which means people waste time looking at it) Thanks :) — psmears
– psmears, Commented Nov 20, 2010 at 19:46

Gnats · Accepted Answer · 2010-12-23 23:11:27Z

0

Turns out that the sample xml file I had been provided was invalid, and lo and behold, upon checking and correcting it in xmllint, everything works.

answered Dec 23, 2010 at 23:11

Gnats

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