Hi there,
My problem is that whenever I try to export a node, from RDF node tab, the node is exported like the following:

<?xml version="1.0" encoding="UTF-8"?>
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
  xmlns:ns0="Arraytitle"
  xmlns:ns1="Arraydate"
  xmlns:ns2="Arraycreated"
  xmlns:ns3="Arrayhas_creator"
  xmlns:ns4="Arraynum_replies">

  <rdf:Description rdf:about="[base_url]node/3">
    <rdf:type>ArrayDocument</rdf:type>
    <ns0:>Node One</ns0:>
    <ns1: rdf:datatype="ArraydateTime">2010-12-18T18:57:39+02:00</ns1:>
    <ns2: rdf:datatype="ArraydateTime">2010-12-18T18:57:39+02:00</ns2:>
    <ns3: rdf:resource="[base_url]user/1"/>
    <ns4: rdf:datatype="Arrayinteger">0</ns4:>
  </rdf:Description>

</rdf:RDF>

I've installed rdfui, rdfx and evoc module from latest dev of rdf module, also I imported all core vocabs.
Also, a drupal message gets appeared after a refresh:

Warning: Illegal offset type in ARC2_RDFSerializer->__init() (line 27 of sites/all/modules/rdf/vendor/arc/serializers/ARC2_RDFSerializer.php).
Warning: Illegal offset type in ARC2_RDFSerializer->__init() (line 27 of sites/all/modules/rdf/vendor/arc/serializers/ARC2_RDFSerializer.php).
Warning: Illegal offset type in ARC2_RDFSerializer->__init() (line 27 of sites/all/modules/rdf/vendor/arc/serializers/ARC2_RDFSerializer.php).
Warning: Illegal offset type in ARC2_RDFSerializer->__init() (line 27 of sites/all/modules/rdf/vendor/arc/serializers/ARC2_RDFSerializer.php).
Warning: Illegal offset type in ARC2_RDFSerializer->__init() (line 27 of sites/all/modules/rdf/vendor/arc/serializers/ARC2_RDFSerializer.php).
Warning: Illegal offset type in ARC2_RDFSerializer->__init() (line 27 of sites/all/modules/rdf/vendor/arc/serializers/ARC2_RDFSerializer.php).
Warning: Illegal offset type in ARC2_RDFSerializer->__init() (line 27 of sites/all/modules/rdf/vendor/arc/serializers/ARC2_RDFSerializer.php).
Warning: Illegal offset type in ARC2_RDFSerializer->__init() (line 27 of sites/all/modules/rdf/vendor/arc/serializers/ARC2_RDFSerializer.php).
Warning: Illegal offset type in ARC2_RDFSerializer->__init() (line 27 of sites/all/modules/rdf/vendor/arc/serializers/ARC2_RDFSerializer.php).

Please let me know if you need further info.
Thanks

CommentFileSizeAuthor
#13 remove-rdfx_get_namespaces-1002076.patch3.14 KBRemon
#4 rdf-1002076.patch518 bytesRemon

Comments

Anonymous’s picture

Anonymous (not verified) commented

This is because of a change in the ARC 2 library. I had the same problem when trying out SPARQL Endpoint, #965010: rdf:type values show up as arrays. Scor suggested a temp fix of just downloading the earlier version of ARC 2 and that worked in my case.

Remon’s picture

Remon commented

I tried out an old arc version from bazaar repository as well as the one on github/scor/rdf, the bug remains though.

Remon’s picture

Remon commented

Actually this happens because namespaces list has some duplicated namespace declaration, for example, skos namespace refers to an Array which has skos full url twice instead of referring to a string. could be a problem of hook_rdf_namespaces or something.

Remon’s picture

Remon commented
StatusFileSize
new rdf-1002076.patch518 bytes

For now, I use a dirty patch the make sure that namespaces are not duplicated.

ebremer’s picture

ebremer commented

I got the same error you did Remon. I even removed RDFx (and submodules), as well as, RDF (core) and uninstalled them all, then installed scor's rdfx (with earlier arc2) and I still got the same error. If I apply your patch, it will export the rdf, but, I don't get all of the RDF, only name and account are exported. I added Last Name and First Name with foaf:firstname and foaf:lastname respectively, but they don't show up.

shunting’s picture

shunting commented

#1 did not work for me.

#4's "dirty patch" did.

datorres’s picture

datorres commented

I have th same problem, but when I try to generate the rdf file I have this : Error de lectura XML: declaración de texto o XML en un lugar distinto del principio de la entidad

datorres’s picture

datorres commented

I have the same problem. You find solution?

If I apply your patch, it will export the rdf, but, I don't get all of the RDF, only name and account are exported. I added Last Name and First Name with foaf:firstname and foaf:lastname respectively, but they don't show up.

scor’s picture

scor commented

@datorres: "I added Last Name and First Name with foaf:firstname and foaf:lastname respectively, but they don't show up." this should be in a seprate issue, it seems unrelated.

scor’s picture

scor commented
Title: RDF node export is missed up » RDF node export is messed up in the presence of duplicate namespaces
Status: Active » Needs work

The problems comes when evoc has imported the core vocabularies and redefined the core namespace. the core function rdf_get_namespaces() was fixed some time ago to strip out any duplicate, so it should really be used instead of a custom function. I've committed a fix which uses the core API directly instead to avoid duplicates.

We should however not need rdfx_get_namespaces() at all, if only for the static caching, which is important in the case of evoc which hits the database. Two options:
1. add static cache in rdf_get_namespaces() in core
2. add static cache inside evoc_rdf_namespaces()

I prefer 2, but that should be a separate performance issue really.

scor’s picture

scor commented
Title: RDF node export is messed up in the presence of duplicate namespaces » Remove rdfx_get_namespaces() and rely on rdf_get_namespaces() instead

repurposing this issue to clean up rdfx.

Remon’s picture

Remon commented

Well, In my humble opinion Option 1 is preferable and is a global fix. A separate issue should be opened on core rdf.

Remon’s picture

Remon commented
Status: Needs work » Needs review
StatusFileSize
new remove-rdfx_get_namespaces-1002076.patch3.14 KB

a patch that removes depending on rdfx_get_namespaces()... if I may :)

Remon’s picture

Remon commented

related core rdf issue #1089040: Cache rdf_get_namespaces using drupal_static

scor’s picture

scor commented
Project: Resource Description Framework (RDF) » RDF Extensions
Component: D7. RDF UI » Code
scor’s picture

scor commented
Status: Needs review » Needs work 
+++ b/rdfx.terms.inc
@@ -39,6 +39,7 @@ function _rdfx_get_terms($term_type) {
 /**
  * Gets a list of all defined namespaces.
+ * TODO deprecate this function
  */
 function rdfx_get_namespaces() {
   $rdf_namespaces = &drupal_static(__FUNCTION__);

how about removing this function entirely? I doubt this is used elsewhere in contrib...

scor’s picture

scor commented

This needs reroll since the RDF export API has changed.

scor’s picture

scor commented
Issue tags: +RDF, +sprint

tagging

Anonymous’s picture

Anonymous (not verified) commented

This should also be checked against coding standards. For example, the TODO statements should be @todo.

scor’s picture

scor commented

you can ignore the hunk from evoc.module and rdfx.terms.inc, it will be removed by another patch. rdfx_get_namespaces() will also go away in another patch.

mlncn’s picture

mlncn commented
Status: Needs work » Postponed

This patch is postponed then until Remon's #1089040: Cache rdf_get_namespaces using drupal_static gets into Drupal 7 core and the evoc.module and rdfx.terms.inc parts are removed, because without any of that it is nothing but checking coding standards against comments and code that won't be here anymore...