WSDL Interface to EPO (European Patent Office)

A

Axel Fuchs

Hi,
I am trying to do patent searches accessing the webservice at the
European patent office
(www.ops.epo.org/patents/patent-information/free/open-patent-services.html).

Here is the code I wrote:

____________________________________________________________
#step 1: SOAP method and parameters

require 'soap/wsdlDriver'
wsdl = 'ops.wsdl'
driver = SOAP::WSDLDriverFactory.new(wsdl).create_rpc_driver

#step 2: SOAP request and response

XSD::Charset.encoding = 'UTF8'

my_query = 'ti=green and ti=plant'
result = driver.biblio-search(my_query,1,3)

________________________________________________


Questions: How do I access the elements in result?
What do I do about this error message:

/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rexml/parsers/baseparser.rb:371:in
`pull': The 'xml' prefix must not be bound to any other namespace
(http://www.w3.org/TR/REC-xml-names/#ns-decl) (REXML::parseException)
Line:
Position:
Last 80 unconsumed characters:
<import namespace="http://www.w3.org/XML/1998/namespace"
schemaLocation="http:/
from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rexml/parsers/baseparser.rb:365:in
`each'
from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rexml/parsers/baseparser.rb:365:in
`pull'
from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rexml/parsers/streamparser.rb:16:in
`parse'
from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rexml/document.rb:201:in
`parse_stream'
from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/xsd/xmlparser/rexmlparser.rb:27:in
`do_parse'
from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/wsdl/xmlSchema/parser.rb:63:in
`parse'
from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/wsdl/xmlSchema/importer.rb:42:in
`parse'
from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/wsdl/xmlSchema/importer.rb:30:in
`import'
from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/wsdl/xmlSchema/importer.rb:19:in
`import'
from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/wsdl/xmlSchema/import.rb:59:in
`import'
from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/wsdl/xmlSchema/import.rb:47:in
`parse_attr'
from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/wsdl/xmlSchema/parser.rb:144:in
`decode_tag'
from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/wsdl/xmlSchema/parser.rb:137:in
`each'
from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/wsdl/xmlSchema/parser.rb:137:in
`decode_tag'
from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/wsdl/xmlSchema/parser.rb:82:in
`start_element'
from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/xsd/xmlparser/parser.rb:67:in
`start_element'
from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/xsd/xmlparser/rexmlparser.rb:34:in
`tag_start'
from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rexml/parsers/streamparser.rb:24:in
`parse'
from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rexml/document.rb:201:in
`parse_stream'
from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/xsd/xmlparser/rexmlparser.rb:27:in
`do_parse'
from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/wsdl/xmlSchema/parser.rb:63:in
`parse'
from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/wsdl/xmlSchema/importer.rb:42:in
`parse'
from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/wsdl/xmlSchema/importer.rb:30:in
`import'
from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/wsdl/xmlSchema/importer.rb:19:in
`import'
from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/wsdl/xmlSchema/import.rb:59:in
`import'
from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/wsdl/xmlSchema/import.rb:47:in
`parse_attr'
from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/wsdl/parser.rb:143:in
`decode_tag'
from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/wsdl/parser.rb:139:in
`each'
from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/wsdl/parser.rb:139:in
`decode_tag'
from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/wsdl/parser.rb:84:in
`start_element'
from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/xsd/xmlparser/parser.rb:67:in
`start_element'
from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/xsd/xmlparser/rexmlparser.rb:34:in
`tag_start'
from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rexml/parsers/streamparser.rb:24:in
`parse'
from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rexml/document.rb:201:in
`parse_stream'
from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/xsd/xmlparser/rexmlparser.rb:27:in
`do_parse'
from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/wsdl/parser.rb:65:in
`parse'
from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/wsdl/importer.rb:29:in
`parse'
from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/wsdl/xmlSchema/importer.rb:30:in
`import'
from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/wsdl/importer.rb:18:in
`import'
from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/soap/wsdlDriver.rb:124:in
`import'
from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/soap/wsdlDriver.rb:28:in
`initialize'
from ./patent_get.rb:7:in `new'
from ./patent_get.rb:7
 
B

Brian Candler

Axel said:
Hi,
I am trying to do patent searches accessing the webservice at the
European patent office
(www.ops.epo.org/patents/patent-information/free/open-patent-services.html).
Click to expand...

$ curl -v
http://www.ops.epo.org/patents/patent-information/free/open-patent-services.html
* getaddrinfo(3) failed for www.ops.epo.org:80
* Couldn't resolve host 'www.ops.epo.org'
* Closing connection #0
curl: (6) Couldn't resolve host 'www.ops.epo.org'

$ dig www.ops.epo.org. a
...
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN,

So it looks like that link is bad (authoritative non-existent domain
answer)
Here is the code I wrote:
Click to expand...

I suggest you follow the steps on the other thread:

- ensure you're using the gem soap4r, not the bundled one
require 'rubygems'
gem 'soap4r'
require 'soap/wsdlDriver'

- build interface classes using wsdl2ruby.rb

- get a wiredump
Questions: How do I access the elements in result?
Click to expand...

- run it in irb and use inspection to look at the available methods
What do I do about this error message:
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rexml/parsers/baseparser.rb:371:in
`pull': The 'xml' prefix must not be bound to any other namespace
(http://www.w3.org/TR/REC-xml-names/#ns-decl) (REXML::parseException)
Click to expand...

This suggests they're sending back invalid XML or that the WSDL has
invalid XML, but we'd need to see a wiredump exchange and/or the WSDL.
 
B

Brian Candler

Brian said:
$ dig www.ops.epo.org. a
...
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN,

So it looks like that link is bad (authoritative non-existent domain
answer)
Click to expand...

It looks like the correct domain is ops.epo.org, not www.ops.epo.org.

The path you gave gives a 404 error. The error page contains a link to
the WSDL at
http://ops.epo.org/patents/patent-information/free/wsdl/ops.wsdl but
that also gives a 404 error.

But I found another link to this:
http://ops.epo.org/wsdl/ops.wsdl

wsdl2ruby.rb says that it doesn't like the wsdl, with the same error you
gave. It seems it doesn't like:

<xsd:import namespace="http://ops.epo.org"
schemaLocation="http://ops.epo.org//schema/ops.xsd"/>

If you fetch this xsd you see that it imports two more xsd's, and these
include these declarations:

xmlns:xml="http://www.w3.org/XML/1998/namespace"

I believe this is what it's objecting to. You can fix these by making
them relative links. Try the attached for size.

Attachments:
http://www.ruby-forum.com/attachment/4583/fixed-xml.zip
 

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