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CODE4LIB  September 2014

CODE4LIB September 2014

Subject:

Re: Python or Perl script for reading RDF/XML, Turtle, or N-triples Files

From:

"Doran, Michael D" <[log in to unmask]>

Reply-To:

Code for Libraries <[log in to unmask]>

Date:

Tue, 30 Sep 2014 11:37:54 -0500

Content-Type:

multipart/mixed

Parts/Attachments:

Parts/Attachments

text/plain (109 lines) , hours.pl.txt (1 lines) , Screen Shot 2014-02-07 at 8.52.40 AM.png (1 lines) , Screen Shot 2014-02-07 at 8.53.25 AM.png (1 lines)

Hi Jean,

> So, I was wondering if any one had an example Python or Perl script for
> reading RDF/XML, Turtle, or N-triples file.  A simple/partial example
> would be fine.

I worked on a Perl script for reading RDF during last year's OCLC Developer House event. 

I used the Perl "RDF::Helper" module since it claimed to "Provide a consistent, high-level API for working with RDF with Perl" [1].  There was a bit of a learning curve and I was not able to find much in the way of RDF::Helper code examples on the interwebs.

For the OCLC Developer House project, we were extracting, parsing, and displaying a library's hours from institutional data in the OCLC WorldCat Registry [2].  I've attached a perl "proof-of-concept" script and a couple of screen shots showing output.  The script file has an additional ".txt" file extension for safe travels thru email.  The script requires non-core perl module(s), as well as specifying a path to a CA Root certs file (for HTTPS gets).

The other Developer House "Registry Hours" project team members worked on a PHP script to do essentially the same thing (although more elegantly and with more functionality).  Their code is available on Github [3].

Good luck!

- Michael Doran

[1] http://search.cpan.org/dist/RDF-Helper/

[2] Examples of data for UTA Libraries:
    https://worldcat.org/wcr/normal-hours/data/2928
    https://worldcat.org/wcr/special-hours/data/2928

[3] https://github.com/oclc-developer-house/wclibhours

# Michael Doran, Systems Librarian
# University of Texas at Arlington
# 817-272-5326 office
# 817-688-1926 mobile
# [log in to unmask]
# http://rocky.uta.edu/doran/

> -----Original Message-----
> From: Code for Libraries [mailto:[log in to unmask]] On Behalf Of
> Jean Roth
> Sent: Tuesday, September 30, 2014 9:14 AM
> To: [log in to unmask]
> Subject: [CODE4LIB] Python or Perl script for reading RDF/XML, Turtle, or
> N-triples Files
> 
> Thank you so much for the reply.
> 
> I have not investigated the LCNAF data set thoroughly.  However, my
> default/ideal is to read in all variables from a dataset.
> 
> So, I was wondering if any one had an example Python or Perl script for
> reading RDF/XML, Turtle, or N-triples file.  A simple/partial example
> would be fine.
> 
> Thanks,
> 
> Jean
> 
> On Mon, 29 Sep 2014, Kyle Banerjee wrote:
> 
> KB> The best way to handle them depends on what you want to do. You need
> to
> KB> actually download the NAF files rather than countries or other small
> files
> KB> as different kinds of data will be organized differently. Just don't
> try to
> KB> read multigigabyte files in a text editor :)
> KB>
> KB> If you start with one of the giant XML files, the first thing you'll
> KB> probably want to do is extract just the elements that are interesting
> to
> KB> you. A short string parsing or SAX routine in your language of choice
> KB> should let you get the information in a format you like.
> KB>
> KB> If you download the linked data files and you're interested in actual
> KB> headings (as opposed to traversing relationships), grep and sed in
> KB> combination with the join utility are handy for extracting the
> elements you
> KB> want and flattening the relationships into something more convenient
> to
> KB> work with. But there are plenty of other tools that you could also
> use.
> KB>
> KB> If you don't already have a convenient environment to work on, I'm a
> fan
> KB> of virtualbox. You can drag and drop things into and out of your
> regular
> KB> desktop or even access it directly. That way you can view/manipulate
> files
> KB> with the linux utilities without having to deal with a bunch of
> clunky file
> KB> transfer operations involving another machine. Very handy for when
> you have
> KB> to deal with multigigabyte files.
> KB>
> KB> kyle
> KB>
> KB> On Mon, Sep 29, 2014 at 11:19 AM, Jean Roth <[log in to unmask]> wrote:
> KB>
> KB> > Thank you!  It looks like the files are available as  RDF/XML,
> Turtle, or
> KB> > N-triples files.
> KB> >
> KB> > Any examples or suggestions for reading any of these formats?
> KB> >
> KB> > The MARC Countries file is small, 31-79 kb.  I assume a script that
> KB> > would read a small file like that would at least be a start for the
> LCNAF
> KB> >
> KB> >
> KB>



#!/usr/bin/perl #################################################################### # # Michael Doran, University of Texas at Arlington # [log in to unmask] # # @ OCLC Developer House # February 3-7, 2014 # # Proof-of-concept for extracting, parsing, and displaying # a library's hours from institutional data in the # OCLC WorldCat Registry. # see: http://www.worldcat.org/registry/Institutions # # Requires non-core Perl module(s) and CA Root certs file # #################################################################### use strict; #################################################################### # Configuration -- start #################################################################### # OCLC organization number (not symbol) for main library unit # aka "Institution Registry ID" # examples: # 2928 for University of Texas at Arlington Library # 128807 for OCLC WorldShare Platform Sandbox Institution #my $oclc_org_no = '2928'; my $oclc_org_no = '128807'; # Path to SSL Root Certificate Authority bundle file # - required for HTTPS gets my $cert_file = '../../ssl.crt/ca-bundle.crt'; # Labels for normal and special hours display my $normal_hrs_label = 'REGULAR HOURS'; my $special_hrs_label = 'SPECIAL HOURS'; #################################################################### # Configuration -- end #################################################################### # Required modules use LWP::UserAgent; use RDF::Helper; #use Date::Calc; # Not used yet, but needed for further development my $oclc_org_base_url = "https://www.worldcat.org/wcr/organization/resource/$oclc_org_no"; my $content = ''; my $normal_hours_uri = ''; my $normal_hours_rdf = ''; my $special_hours_uri = ''; my $special_hours_rdf = ''; my $null = undef; my $ua = LWP::UserAgent->new; $ua->timeout(10); $ua->default_header('Accept' => 'application/rdf+xml'); $ua->ssl_opts( SSL_ca_file => "$cert_file" ); my $rdf = RDF::Helper->new( BaseInterface => 'RDF::Trine', namespaces => { rdf => "http://www.w3.org/1999/02/22-rdf-syntax-ns#", wcir => "http://purl.org/oclc/ontology/wcir/", schema => "http://schema.org/", rdfs => "http://www.w3.org/2000/01/rdf-schema#", umbel => "http://umbel.org/umbel#", foaf => "http://xmlns.com/foaf/0.1/", library => "http://purl.org/library/", xsi => "http://www.w3.org/2001/XMLSchema-instance", dcterms => "http://purl.org/dc/terms/" }, ExpandQNames => 1 ); GetInstData(); NormalHours($normal_hours_uri); SpecialHours($special_hours_uri); exit(0); ######################### # GetRDFDoc ######################### sub GetRDFDoc { my ($uri) = @_; my $response = $ua->get("$uri"); if ($response->is_success) { $content = $response->decoded_content; } else { die $response->status_line; } } ######################### # GetInstData ######################### sub GetInstData { GetRDFDoc("$oclc_org_base_url"); $rdf->include_rdfxml(xml => $content); my $hash_ref = $rdf->tied_property_hash($oclc_org_base_url); my %prop_value_hash = %$hash_ref; my $institution = $prop_value_hash{'wcir:institutionName'}; my $library = $prop_value_hash{'wcir:unitName'}; $normal_hours_uri = $prop_value_hash{'wcir:normalHours'}; $special_hours_uri = $prop_value_hash{'wcir:specialHours'}; print "\n" . "$institution" . "\n"; if ($library) { print "$library" . "\n"; } } ######################### # NormalHours ######################### sub NormalHours { my ($normal_hours_uri) = @_; unless ($normal_hours_uri) { return; } print "\n" . "$normal_hrs_label" . "\n\n"; $normal_hours_rdf = GetRDFDoc("$normal_hours_uri"); $rdf->include_rdfxml(xml => $normal_hours_rdf); my $norm_hours_hash_ref = $rdf->tied_property_hash($normal_hours_uri); my %norm_value_hash = %$norm_hours_hash_ref; foreach my $week_day ('Monday','Tuesday','Wednesday','Thursday','Friday','Saturday','Sunday') { my $day_hash_ref = $rdf->tied_property_hash("$normal_hours_uri#$week_day"); my %day_hash = %$day_hash_ref; my $open_status = $day_hash{'wcir:openStatus'}; my $open_hour = $day_hash{'wcir:opens'}; my $close_hour = $day_hash{'wcir:closes'}; if ($open_status eq "Open24Hours") { print "$week_day open 24 hours" . "\n"; } elsif ($open_status eq "Open") { print "$week_day open from $open_hour to $close_hour" . "\n"; } elsif ($open_status eq "Closed") { print "$week_day is closed" . "\n"; } } } ######################### # SpecialHours ######################### sub SpecialHours { unless ($special_hours_uri) { return; } print "\n" . "$special_hrs_label" . "\n"; $special_hours_rdf = GetRDFDoc ("$special_hours_uri"); $rdf->include_rdfxml(xml => $special_hours_rdf); my $spec_hours_hash_ref = $rdf->tied_property_hash($special_hours_uri); my %spec_value_hash = %$spec_hours_hash_ref; # problem area here - fixed # - when single value returned to $hoursSpecs, can't dereference # - if don't deference, can't handle when it is an array reference returned, # e.g. ARRAY(0x7fd4c2b34f40) # Solution: test with perl 'ref' function my $hoursSpecs = $spec_value_hash{'wcir:hoursSpecifiedBy'}; my @deref_hoursSpecs; if (ref($hoursSpecs)) { @deref_hoursSpecs = @$hoursSpecs; } else { @deref_hoursSpecs = $hoursSpecs; } my %spec_hours_instances; foreach my $i (@deref_hoursSpecs) { my $day_hash_ref = $rdf->tied_property_hash("$i"); my %day_hash = %$day_hash_ref; my $valid_from = $day_hash{'wcir:validFrom'}; $spec_hours_instances{$valid_from} = $i; } foreach my $key (sort keys %spec_hours_instances) { print "\n"; my $day_hash_ref = $rdf->tied_property_hash("$spec_hours_instances{$key}"); my %day_hash = %$day_hash_ref; my $description = $day_hash{'wcir:description'}; my $open_status = $day_hash{'wcir:openStatus'}; my $open_hour = $day_hash{'wcir:opens'}; my $close_hour = $day_hash{'wcir:closes'}; my $valid_from = $day_hash{'wcir:validFrom'}; my $valid_to = $day_hash{'wcir:validTo'}; print "$description" . "\n"; if ($open_status eq "Open24Hours") { print "Open 24 hours" . "\n"; } elsif ($open_status eq "Open") { print "Open from $open_hour to $close_hour" . "\n"; } elsif ($open_status eq "Closed") { print "Closed" . "\n"; } print "From $valid_from to $valid_to" . "\n"; } }

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