diff --git a/rdfa/LICENSE.txt b/rdfa/LICENSE.txt
new file mode 100644
index 0000000..6b0b127
--- /dev/null
+++ b/rdfa/LICENSE.txt
@@ -0,0 +1,203 @@
+
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diff --git a/rdfa/rdfa.xqy b/rdfa/rdfa.xqy
new file mode 100644
index 0000000..5ccf313
--- /dev/null
+++ b/rdfa/rdfa.xqy
@@ -0,0 +1,391 @@
+xquery version "1.0";
+
+(:
+ : Copyright (c) 2008 Mark Logic Corporation. All rights reserved.
+ :
+ : Licensed under the Apache License, Version 2.0 (the "License");
+ : you may not use this file except in compliance with the License.
+ : You may obtain a copy of the License at
+ :
+ : http://www.apache.org/licenses/LICENSE-2.0
+ :
+ : Unless required by applicable law or agreed to in writing, software
+ : distributed under the License is distributed on an "AS IS" BASIS,
+ : WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ : See the License for the specific language governing permissions and
+ : limitations under the License.
+ :)
+
+(: default element namespace="http://www.w3.org/1999/xhtml" :)
+
+module namespace ml = "http://marklogic.com/ns/rdfa-impl#";
+declare default function namespace "http://www.w3.org/2005/xpath-functions";
+declare namespace html = "http://www.w3.org/1999/xhtml";
+
+declare namespace rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#";
+
+declare variable $dfvocab := "http://www.w3.org/1999/xhtml/vocab#";
+declare variable $default-base := ("http://BASE.URI");
+declare variable $htmlrels := ( "alternate",
+ "appendix",
+ "bookmark",
+ "cite",
+ "chapter",
+ "contents",
+ "copyright",
+ "glossary",
+ "help",
+ "icon",
+ "index",
+ "last",
+ "license",
+ "meta",
+ "next",
+ "p3pv1",
+ "prev",
+ "role",
+ "section",
+ "start",
+ "stylesheet",
+ "subsection",
+ "up" );
+
+(: we don't have a guarantee that base-uri will be set in non-database docs
+, so we have to explicitly pass it in :)
+declare function ml:parse_rdfa($doc as node(), $url as xs:string) as element(rdf:RDF) {
+
+
+{
+ let $base := if ($doc//html:head/html:base/@href)
+ then $doc//html:head/html:base/@href
+ else if ($url)
+ then $url
+ else $default-base
+ for $node in $doc//*
+ return (
+ if ($node/@property)
+ then ml:property($node, string($node/@property), $base)
+ else (),
+
+ if ($node/@rel)
+ then ml:relrev($node, string($node/@rel), "rel", $base)
+ else (),
+
+ if ($node/@rev)
+ then ml:relrev($node, string($node/@rev), "rev", $base)
+ else (),
+
+ if ($node/@typeof)
+ then ml:typeof($node, string($node/@typeof), $base)
+ else ()
+ )
+}
+
+};
+
+(: for triples created from this very $node, what is the subject? :)
+declare function ml:subject($node as node(), $base as xs:string) {
+ if ($node/@about)
+ then ml:safe-resolve-uri-or-curie($node/@about, $node, $base)
+ else if ($node/@src)
+ then ml:safe-resolve-uri($node/@src, $base)
+ else if (local-name($node) = ("head", "body"))
+ then $base
+ else if ($node/@typeof)
+ then ml:generate-bnode-id($node, "typeof")
+ else ml:subject-ancestor($node/.., $base)
+};
+
+(: looking down the ancestor chain, what is the subject? :)
+declare function ml:subject-ancestor($node as node(), $base as xs:string) {
+ if ($node/@resource)
+ then ml:safe-resolve-uri-or-curie($node/@resource, $node, $base)
+ else if ($node/@href)
+ then ml:safe-resolve-uri($node/@href, $base)
+ else if ($node/(@rel | @rev))
+ then ml:generate-bnode-id($node)
+ else if ($node/@about)
+ then ml:safe-resolve-uri-or-curie($node/@about, $node, $base)
+ else if ($node/@src)
+ then ml:safe-resolve-uri($node/@src, $base)
+ else if ($node/@typeof)
+ then ml:generate-bnode-id($node, "typeof")
+ else if ($node/..)
+ then ml:subject-ancestor($node/.., $base)
+ else $base
+};
+
+declare function ml:property($node as node(), $val as xs:string, $base as xs:string) as element()* {
+ for $prop in if (normalize-space($val) eq "") then () else tokenize($val, "\s+")
+ let $prefix := substring-before($prop, ":")
+ let $nsuri := namespace-uri-for-prefix($prefix, $node)
+ let $isXML := ($node/@datatype and ml:expand-curie($node/@datatype, $node) eq "http://www.w3.org/1999/02/22-rdf-syntax-ns#XMLLiteral" or
+ (not($node/@datatype) and $node/node() and $node/(node() except text()) ))
+ let $effective-dt := if ($node/@datatype and $node/@datatype ne "")
+ then
+ if ($isXML)
+ then false() (: "http://www.w3.org/1999/02/22-rdf-syntax-ns#XMLLiteral" :)
+ else ml:expand-curie(($node/@datatype,"")[1], $node)
+ else false()
+ let $lang := ($node/ancestor-or-self::*/@xml:lang)[position() eq last()]
+ let $subj := ml:subject($node, $base)
+ where 1
+ return
+ if ($subj)
+ then
+
+ {
+ if (starts-with($subj, "_"))
+ then attribute rdf:nodeID { $subj }
+ else attribute rdf:about { $subj },
+
+ element { ml:curie-to-qname($prop, $node) }
+ {
+ if ($effective-dt)
+ then attribute rdf:datatype {$effective-dt}
+ else (),
+
+ $lang,
+
+ (: proper XML Literal?? :)
+ if ($isXML)
+ then (attribute rdf:parseType { "Literal" } , for $n in $node/node() return ml:deep-copy($n) )
+ else string(if ($node/@content) then $node/@content else $node)
+ }
+ }
+
+ else ()
+};
+
+declare function ml:relrev($node as node(), $val as xs:string, $relorrev, $base as xs:string) as element()* {
+ if ($node/@resource or $node/@href)
+ then ml:relrev-immed($node, $val, $relorrev, $base)
+ else (ml:relrev-hanging($node, $val, $relorrev, $base), ml:relrev-hanging-bnode($node, $val, $relorrev, $base))
+};
+
+(: Generate an immediate triple (or several, if @rel or @ref is a space-sep list) :)
+declare function ml:relrev-immed($node as node(), $val as xs:string, $relorrev, $base as xs:string) as element()* {
+ for $relv in if (normalize-space($val) eq "") then () else tokenize($val, "\s+")
+ let $prefix := substring-before($relv, ":")
+ let $locobj := if ($node/@resource)
+ then ml:safe-resolve-uri-or-curie($node/@resource, $node, $base)
+ else ml:safe-resolve-uri($node/@href, $base)
+
+ let $locsbj := ml:subject($node, $base)
+ let $effective-sbj := if ($relorrev eq "rel") then $locsbj else $locobj
+ let $effective-obj := if ($relorrev eq "rel") then $locobj else $locsbj
+ where ml:curie-is-valid($relv, $node)
+ return
+ if ($locsbj and $locobj)
+ then
+
+ {
+ if (starts-with($effective-sbj, "_"))
+ then attribute rdf:nodeID { $effective-sbj }
+ else attribute rdf:about { $effective-sbj },
+
+ element { ml:curie-to-qname($relv, $node) }
+ {
+ if (starts-with($effective-obj, "_"))
+ then attribute rdf:nodeID { $effective-obj }
+ else attribute rdf:resource { $effective-obj }
+ }
+ }
+
+ else ()
+};
+
+(: Generate potentially multiple, hanging triples :)
+declare function ml:relrev-hanging($node as node(), $val as xs:string, $relorrev, $base as xs:string) as element()* {
+ for $relv in if (normalize-space($val) eq "") then () else tokenize($val, "\s+")
+ let $prefix := substring-before($relv, ":")
+ let $locsbj := ml:subject($node, $base)
+ for $tpl in ml:hanging-descendants($node)
+ let $locobj := if ($tpl/@about)
+ then ml:safe-resolve-uri-or-curie($tpl/@about, $tpl, $base)
+ else if ($tpl/@src)
+ then ml:safe-resolve-uri($tpl/@src, $base)
+ else if ($tpl/@typeof)
+ then ml:generate-bnode-id($tpl, "typeof")
+ else if ($tpl/(@rel | @rev))
+ then ()
+ else if ($tpl/@resource)
+ then ml:safe-resolve-uri-or-curie($tpl/@resource, $tpl, $base)
+ else if ($tpl/@href)
+ then ml:safe-resolve-uri($tpl/@href, $base)
+ else ml:generate-bnode-id($tpl)
+ let $effective-sbj := if ($relorrev eq "rel") then $locsbj else $locobj
+ let $effective-obj := if ($relorrev eq "rel") then $locobj else $locsbj
+ where ml:curie-is-valid($relv, $node)
+ return
+ if ($locsbj and $locobj)
+ then
+
+ {
+ if (starts-with($effective-sbj, "_"))
+ then attribute rdf:nodeID { $effective-sbj }
+ else attribute rdf:about { $effective-sbj },
+
+ element { ml:curie-to-qname($relv, $node) }
+ {
+ if (starts-with($effective-obj, "_"))
+ then attribute rdf:nodeID { $effective-obj }
+ else attribute rdf:resource { $effective-obj }
+ }
+ }
+
+ else ()
+};
+
+(: this is to generate the 1 (or none) bnode reference that all @rel/@rev/@property completers share :)
+declare function ml:relrev-hanging-bnode($node as node(), $val as xs:string, $relorrev, $base as xs:string) as element()* {
+ for $relv in if (normalize-space($val) eq "") then () else tokenize($val, "\s+")
+ let $locsbj := ml:subject($node, $base)
+ let $locobj := ml:generate-bnode-id($node)
+ let $effective-sbj := if ($relorrev eq "rel") then $locsbj else $locobj
+ let $effective-obj := if ($relorrev eq "rel") then $locobj else $locsbj
+ where ml:curie-is-valid($relv, $node)
+ return
+ if (ml:hanging-bnode($node))
+ then
+ {
+ if (starts-with($effective-sbj, "_"))
+ then attribute rdf:nodeID { $effective-sbj }
+ else attribute rdf:about { $effective-sbj },
+
+ element { ml:curie-to-qname($relv, $node) }
+ {
+ if (starts-with($effective-obj, "_"))
+ then attribute rdf:nodeID { $effective-obj }
+ else attribute rdf:resource { $effective-obj }
+ }
+ }
+
+ else ()
+};
+
+declare function ml:hanging-descendants($node as node()) as node()* {
+ (: find all descendant nodes with hanging-triple-completing-via-new-node attributes... :)
+ $node//*[@src or @about or @typeof or @href or @resource]
+ [count(($node//* intersect ./ancestor::*)/(@src | @about | @typeof | @href | @resource)) eq 0]
+ (: but exclude stuff we've already seen, and stuff more than one level deep
+ (the deeper stuff is "yet to be seen") :)
+};
+
+declare function ml:hanging-bnode($node as node()) as node()* {
+ (: find all descendant nodes with hanging-triple-completing-via-the-same-bnode attributes... :)
+ $node//*[@rel or @rev or @property]
+ [count(($node//* intersect ./ancestor::*)/(@rel | @rev | @property)) eq 0]
+ (: but exclude stuff we've already seen, and stuff more than one level deep
+ (the deeper stuff is "yet to be seen") :)
+};
+
+declare function ml:typeof($node as node(), $val as xs:string, $base as xs:string) as element()* {
+ for $type in if (normalize-space($val) eq "") then () else tokenize($val, "\s+")
+ let $locsbj := if ($node/@about)
+ then ml:safe-resolve-uri-or-curie($node/@about, $node, $base)
+ else if ($node/@src)
+ then ml:safe-resolve-uri($node/@src, $base)
+ else if (local-name($node) = ("head", "body"))
+ then $base
+ else if ($node/@resource and not($node/(@rel | @rev)))
+ then ml:safe-resolve-uri-or-curie($node/@resource, $node, $base)
+ else if ($node/@href and not($node/(@rel | @rev)))
+ then ml:safe-resolve-uri($node/@href, $base)
+ else ml:generate-bnode-id($node, "typeof")
+ let $rsc := ml:expand-curie($type, $node)
+ return
+ if ($locsbj and $rsc)
+ then
+
+ {
+ if (starts-with($locsbj, "_"))
+ then attribute rdf:nodeID { $locsbj }
+ else attribute rdf:about { $locsbj }
+ }
+
+
+ else ()
+};
+
+(: compensate for the lack of generate-id function (XSLT has it good here!) :)
+declare function ml:generate-id($node as element()) as xs:string {
+ concat("node", count($node/preceding::*), local-name($node), count($node/ancestor::*) )
+};
+
+declare function ml:generate-bnode-id($node as element()) as xs:string {
+ ml:generate-bnode-id($node, "")
+};
+
+declare function ml:generate-bnode-id($node as element(), $extra as xs:string) as xs:string {
+ concat("_:b", ml:generate-id($node), $extra)
+};
+
+(: curie parts: 1:prefix, 2:suffix, 3:uri 3 will be missing for invalid CURIEs :)
+declare function ml:curie-parse($curie as xs:string, $context as element()) as xs:string* {
+ let $prefix := substring-before($curie, ":")
+ let $nsuri := if ($prefix eq "") then $dfvocab else namespace-uri-for-prefix($prefix, $context)
+ let $suffix := if ($nsuri eq $dfvocab)
+ then if (starts-with($curie, ":"))
+ then substring-after($curie, ":")
+ else $curie
+ else substring-after($curie, ":")
+ return ($prefix, $suffix, $nsuri)
+};
+
+declare function ml:curie-is-valid($curie as xs:string, $context as element()) as xs:boolean {
+ let $parts := ml:curie-parse($curie, $context)
+ return ($parts[1] eq "_") or ($parts[3] eq $dfvocab and $parts[2] = $htmlrels) or ($parts[1] ne "" and $parts[3] ne "")
+};
+
+declare function ml:expand-curie($curie as xs:string, $context as element()) as xs:string {
+ let $parts := ml:curie-parse($curie, $context)
+ return if ($parts[1] eq "_") then $curie else concat($parts[3], $parts[2])
+};
+
+(: RDF serialization requires a qname, which might not match exactly with a CURIE :)
+declare function ml:curie-to-qname($curie as xs:string, $context as element()) as xs:QName? {
+ let $expanded := ml:expand-curie($curie, $context)
+ let $elem-part := replace ($expanded , '^.*[#|/]','')
+ let $ns-part := replace($expanded, concat('^(.*)', $elem-part,'.*'),'$1')
+ return fn:QName($ns-part, $elem-part)
+};
+
+(: there is some spec ambiguity on how fn:resolve-uri() should behave with a
+zero-length input. We sidestep it by handling it explicitly here :)
+declare function ml:safe-resolve-uri($rel as xs:string, $base as xs:string) as xs:string {
+ if ($rel eq "")
+ then $base
+ else if (starts-with($rel, "#"))
+ then concat($base, $rel)
+ else resolve-uri($rel, $base)
+};
+
+declare function ml:safe-resolve-uri-or-curie($val as xs:string, $context as element(), $base as xs:string) as xs:string? {
+ if (starts-with($val, "[") and ends-with($val, "]"))
+ then let $curie := substring-after(substring-before($val, "]"), "[")
+ return if (ml:curie-is-valid($curie, $context))
+ then ml:expand-curie($curie, $context)
+ else ()
+ else ml:safe-resolve-uri($val, $base)
+};
+
+(: return a deep copy of the node and all children :)
+declare function ml:deep-copy($node as node()) as node() {
+
+ typeswitch($node)
+ case element() return
+ element { node-name($node) }
+ {
+ $node/@*,
+ for $child in $node/node()
+ return
+ if ($child instance of element())
+ then ml:deep-copy($child)
+ else $child
+ }
+ case attribute() return $node
+ case text() return $node
+ default return $node
+};
+
diff --git a/rdfa/rdfa_extract.xqy b/rdfa/rdfa_extract.xqy
new file mode 100644
index 0000000..30e2a03
--- /dev/null
+++ b/rdfa/rdfa_extract.xqy
@@ -0,0 +1,17 @@
+xquery version "1.0-ml";
+
+(: Copyright 2002-2008 Mark Logic Corporation. All Rights Reserved. :)
+
+import module namespace rdfa = "http://marklogic.com/ns/rdfa-impl#" at "rdfa.xqy";
+
+declare variable $url := xdmp:get-request-field('url');
+
+let $doc := xdmp:document-get($url,
+
+ xml
+ full
+ )
+return (
+xdmp:add-response-header("Content-type", "application/rdf+xml"),
+rdfa:parse_rdfa($doc, $url)
+)
\ No newline at end of file