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using System;
using System.Collections;
using System.IO;
using System.Text;
using System.Xml;
using SemWeb.Util;
namespace SemWeb {
public class RdfXmlReader : RdfReader {
// TODO: Make some of the errors warnings.
XmlReader xml;
Hashtable blankNodes = new Hashtable();
UriMap namedNodes = new UriMap();
Hashtable seenIDs = new Hashtable();
StatementSink storage;
static readonly Entity
rdfType = "http://www.w3.org/1999/02/22-rdf-syntax-ns#type",
rdfFirst = "http://www.w3.org/1999/02/22-rdf-syntax-ns#first",
rdfRest = "http://www.w3.org/1999/02/22-rdf-syntax-ns#rest",
rdfNil = "http://www.w3.org/1999/02/22-rdf-syntax-ns#nil",
rdfSubject = "http://www.w3.org/1999/02/22-rdf-syntax-ns#subject",
rdfPredicate = "http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate",
rdfObject = "http://www.w3.org/1999/02/22-rdf-syntax-ns#object",
rdfStatement = "http://www.w3.org/1999/02/22-rdf-syntax-ns#Statement";
#if !SILVERLIGHT
public RdfXmlReader(XmlDocument document) {
xml = new XmlBaseAwareReader(new XmlNodeReader(document));
LoadNamespaces();
}
#endif
public RdfXmlReader(XmlReader document) {
XmlValidatingReader reader = new XmlValidatingReader(document); // decodes entity definitions
reader.ValidationType = ValidationType.None;
xml = new XmlBaseAwareReader(reader);
LoadNamespaces();
}
public RdfXmlReader(TextReader document) : this(new XmlTextReader(document)) {
}
public RdfXmlReader(Stream document) : this(new StreamReader(document)) {
}
public RdfXmlReader(TextReader document, string baseUri) : this(document) {
BaseUri = baseUri;
}
public RdfXmlReader(Stream document, string baseUri) : this(new StreamReader(document), baseUri) {
}
public RdfXmlReader(string file, string baseUri) : this(GetReader(file), baseUri) {
}
public RdfXmlReader(string file) : this(GetReader(file), "file:///" + file) {
}
private void LoadNamespaces() {
// Move to the document element and load any namespace
// declarations on the node.
while (xml.Read()) {
if (xml.NodeType != XmlNodeType.Element) continue;
if (xml.MoveToFirstAttribute()) {
do {
if (xml.Prefix == "xmlns")
Namespaces.AddNamespace(xml.Value, xml.LocalName);
} while (xml.MoveToNextAttribute());
xml.MoveToElement();
}
break;
}
}
public override void Select(StatementSink storage) {
// Read past the processing instructions to
// the document element. If it is rdf:RDF,
// then process the description nodes within it.
// Otherwise, the document element is itself a
// description.
this.storage = storage;
bool first = true; // on the first iteration don't
// advance to the next node -- we already did that
while (first || xml.Read()) {
first = false;
if (xml.NodeType != XmlNodeType.Element) continue;
if (xml.NamespaceURI == NS.RDF && xml.LocalName == "RDF" ) {
// If there is an xml:base here, set BaseUri so
// the application can recover it. It doesn't
// affect parsing since the xml:base attribute
// will override BaseUri.
string xmlbase = xml.GetAttribute("xml:base");
if (xmlbase != null) BaseUri = xmlbase;
while (xml.Read()) {
if (xml.NodeType == XmlNodeType.Element)
ParseDescription();
}
} else {
ParseDescription();
}
break;
}
xml.Close();
}
private string CurNode() {
if (xml.NamespaceURI == "")
OnWarning("Element node must be qualified (" + xml.Name + ")");
if (xml.Prefix != "")
Namespaces.AddNamespace(xml.NamespaceURI, xml.Prefix);
// This probably isn't quite right, but compensates
// for a corresponding hash issue in XmlWriter.
if (xml.NamespaceURI == "" && BaseUri == null)
return "#" + xml.LocalName;
return CheckUri(xml.NamespaceURI + xml.LocalName);
}
private string CheckUri(string uri) {
string error = Entity.ValidateUri(uri);
if (error != null)
OnWarning("The URI <" + uri + "> is not valid: " + error);
return uri;
}
private int isset(string attribute) {
return attribute != null ? 1 : 0;
}
private string Unrelativize(string uri) {
return CheckUri(GetAbsoluteUri(xml.BaseURI != "" ? xml.BaseURI : BaseUri, uri));
}
private Entity GetBlankNode(string nodeID) {
if (blankNodes.ContainsKey(nodeID))
return (Entity)blankNodes[nodeID];
Entity entity = new BNode(nodeID);
blankNodes[nodeID] = entity;
return entity;
}
private Entity GetNamedNode(string uri) {
if (!ReuseEntities)
return new Entity(uri);
Entity ret = (Entity)namedNodes[uri];
if (ret != null) return ret;
ret = new Entity(uri);
namedNodes[uri] = ret;
return ret;
}
private Entity ParseDescription() {
// The XmlReader is positioned on an element node
// that is a description of an entity.
// On returning, the reader is positioned after the
// end element of the description node.
string nodeID = xml.GetAttribute("nodeID", NS.RDF);
string about = xml.GetAttribute("about", NS.RDF);
string ID = xml.GetAttribute("ID", NS.RDF);
if (isset(nodeID) + isset(about) + isset(ID) > 1)
OnError("An entity description cannot specify more than one of rdf:nodeID, rdf:about, and rdf:ID");
if (nodeID != null && !IsValidXmlName(nodeID))
OnWarning("'" + nodeID + "' is not a valid XML Name");
if (ID != null && !IsValidXmlName(ID))
OnWarning("'" + ID + "' is not a valid XML Name");
Entity entity;
if (about != null)
entity = GetNamedNode(Unrelativize(about));
else if (ID != null) {
entity = GetNamedNode(Unrelativize("#" + ID));
if (seenIDs.ContainsKey(entity.Uri))
OnWarning("Two descriptions should not use the same rdf:ID: <" + entity.Uri + ">");
seenIDs[entity.Uri] = seenIDs;
} else if (nodeID != null)
entity = GetBlankNode(nodeID);
else
entity = new BNode();
// If the name of the element is not rdf:Description,
// then the name gives its type.
string curnode = CurNode();
if (curnode != NS.RDF + "Description") {
if (IsRestrictedName(curnode) || IsDeprecatedName(curnode))
OnError(xml.Name + " cannot be the type of a resource.");
if (curnode == NS.RDF + "li") OnError("rdf:li cannot be the type of a resource");
storage.Add(new Statement(entity, rdfType, (Entity)curnode, Meta));
}
ParsePropertyAttributes(entity);
ParsePropertyNodes(entity);
return entity;
}
private bool ParsePropertyAttributes(Entity entity) {
bool foundAttrs = false;
if (!xml.MoveToFirstAttribute()) return false;
do {
// Propery attributes in the default namespace
// should be ignored.
if (xml.NamespaceURI == "")
continue;
string curnode = CurNode();
// rdf:type is interpreted with an entity object,
// not a literal object.
if (curnode == NS.RDF + "type") {
storage.Add(new Statement(entity, rdfType, (Entity)xml.Value, Meta));
foundAttrs = true;
continue;
}
// Properties which are not recognized as property
// attributes and should be ignored.
if (IsRestrictedName(curnode))
continue;
if (IsDeprecatedName(curnode))
OnError(xml.Name + " is deprecated.");
// Properties which are invalid as attributes.
if (curnode == NS.RDF + "li")
OnError("rdf:li is not a valid attribute");
if (curnode == NS.RDF + "aboutEach" || curnode == NS.RDF + "aboutEachPrefix")
OnError("rdf:aboutEach has been removed from the RDF spec");
// Unrecognized attributes in the xml namespace should be ignored.
if (xml.Prefix == "xml") continue;
if (xml.Prefix == "xmlns") continue;
if (curnode == "http://www.w3.org/2000/xmlns/xmlns") continue;
// This is a literal property attribute.
string lang = xml.XmlLang != "" ? xml.XmlLang : null;
storage.Add(new Statement(entity, curnode,
new Literal(xml.Value, lang, null), Meta));
Namespaces.AddNamespace(xml.NamespaceURI, xml.Prefix);
foundAttrs = true;
} while (xml.MoveToNextAttribute());
xml.MoveToElement();
return foundAttrs;
}
private void ParsePropertyNodes(Entity subject) {
// The reader is positioned within a description node.
// On returning, the reader is positioned after the
// end element of the description node.
if (xml.IsEmptyElement) return;
int liIndex = 1;
while (xml.Read()) {
if (xml.NodeType == XmlNodeType.EndElement)
break;
if (xml.NodeType == XmlNodeType.Text) {
OnWarning("Text \"" + xml.Value + "\" ignored in description node");
continue;
}
if (xml.NodeType != XmlNodeType.Element)
continue;
ParseProperty(subject, ref liIndex);
}
}
private void ParseProperty(Entity subject, ref int liIndex) {
// The reader is positioned on a propert node,
// and on returning the reader is positioned past
// that node.
// Get all of the attributes before we move the reader forward.
string nodeID = xml.GetAttribute("nodeID", NS.RDF);
string resource = xml.GetAttribute("resource", NS.RDF);
string parseType = xml.GetAttribute("parseType", NS.RDF);
string datatype = xml.GetAttribute("datatype", NS.RDF);
string lang = xml.XmlLang != "" ? xml.XmlLang : null;
string predicate = CurNode();
if (predicate == NS.RDF + "li")
predicate = NS.RDF + "_" + (liIndex++);
if (IsRestrictedName(predicate))
OnError(xml.Name + " cannot be used as a property name.");
if (IsDeprecatedName(predicate))
OnError(xml.Name + " has been deprecated and cannot be used as a property name.");
string ID = xml.GetAttribute("ID", NS.RDF);
if (nodeID != null && !IsValidXmlName(nodeID))
OnWarning("'" + nodeID + "' is not a valid XML Name");
if (ID != null && !IsValidXmlName(ID))
OnWarning("'" + ID + "' is not a valid XML Name");
Resource objct = null;
if (nodeID != null || resource != null) {
if (isset(nodeID) + isset(resource) > 1)
OnError("A predicate node cannot specify more than one of rdf:nodeID and rdf:resource");
if (parseType != null || datatype != null)
OnError("The attributes rdf:parseType and rdf:datatype are not valid on a predicate with a rdf:nodeID or rdf:resource attribute");
// Object is an entity given by nodeID or resource.
if (nodeID != null)
objct = GetBlankNode(nodeID);
else if (resource != null)
objct = GetNamedNode(Unrelativize(resource));
ParsePropertyAttributes((Entity)objct);
// No children are allowed in this element.
if (!xml.IsEmptyElement)
while (xml.Read()) {
if (xml.NodeType == XmlNodeType.EndElement) break;
if (xml.NodeType == XmlNodeType.Whitespace) continue;
if (xml.NodeType == XmlNodeType.Comment) continue;
if (xml.NodeType == XmlNodeType.ProcessingInstruction) continue;
OnError("Content is not allowed within a property with a rdf:nodeID or rdf:resource attribute");
}
} else if (parseType != null && parseType == "Literal") {
if (datatype != null)
OnError("The attribute rdf:datatype is not valid on a predicate whose parseType is Literal.");
datatype = "http://www.w3.org/1999/02/22-rdf-syntax-ns#XMLLiteral";
if (ParsePropertyAttributes(new BNode()))
OnError("Property attributes are not valid when parseType is Literal");
// TODO: Do we canonicalize according to:
// http://www.w3.org/TR/2002/REC-xml-exc-c14n-20020718/ ?
objct = new Literal(xml.ReadInnerXml(), null, datatype);
} else if (parseType != null && parseType == "Resource") {
objct = new BNode();
ParsePropertyAttributes((Entity)objct);
if (!xml.IsEmptyElement)
ParsePropertyNodes((Entity)objct);
} else if (parseType != null && parseType == "Collection") {
Entity collection = new BNode();
Entity lastnode = collection;
bool empty = true;
ParsePropertyAttributes(collection);
if (!xml.IsEmptyElement)
while (xml.Read()) {
if (xml.NodeType == XmlNodeType.EndElement) break;
if (xml.NodeType != XmlNodeType.Element) continue;
if (!empty) {
Entity next = new BNode();
storage.Add(new Statement(lastnode, rdfRest, next, Meta));
lastnode = next;
}
Entity item = ParseDescription();
storage.Add(new Statement(lastnode, rdfFirst, item, Meta));
empty = false;
}
storage.Add(new Statement(lastnode, rdfRest, rdfNil, Meta));
if (empty)
objct = rdfNil;
else
objct = collection;
} else if (parseType != null) {
OnError("Invalid value for parseType: '" + parseType + "'");
} else if (datatype != null) {
// Note that any xml:lang is discarded.
if (ParsePropertyAttributes(new BNode()))
OnError("Property attributes are not valid when a datatype is given");
if (xml.IsEmptyElement) {
objct = new Literal("", null, datatype);
} else {
objct = new Literal(xml.ReadString(), null, datatype);
if (xml.NodeType != XmlNodeType.EndElement)
OnError("XML markup may not appear in a datatyped literal property.");
}
} else {
// We don't know whether the contents of this element
// refer to a literal or an entity. If an element is
// a child of this node, then it must be an entity.
// If the property has predicate attributes, then it
// is an anonymous entity. Otherwise the text content
// is the literal value.
objct = new BNode();
if (ParsePropertyAttributes((Entity)objct)) {
// Found property attributes. There should be no other internal content?
if (!xml.IsEmptyElement)
while (xml.Read()) {
if (xml.NodeType == XmlNodeType.EndElement) break;
if (xml.NodeType == XmlNodeType.Whitespace) continue;
if (xml.NodeType == XmlNodeType.Comment) continue;
if (xml.NodeType == XmlNodeType.ProcessingInstruction) continue;
OnError(xml.NodeType + " is not allowed within a property with property attributes");
}
} else {
StringBuilder textcontent = new StringBuilder();
bool hadText = false;
bool hadElement = false;
if (!xml.IsEmptyElement)
while (xml.Read()) {
if (xml.NodeType == XmlNodeType.EndElement) break;
if (xml.NodeType == XmlNodeType.Element) {
if (hadText)
OnError("Both text and elements are present as a property value");
if (hadElement)
OnError("A property node cannot contain more than one entity description. " + objct + " already found.");
hadElement = true;
objct = ParseDescription();
} else if (xml.NodeType == XmlNodeType.Text || xml.NodeType == XmlNodeType.SignificantWhitespace) {
if (hadElement)
OnError("Both text and elements are present as a property value");
textcontent.Append(xml.Value);
hadText = true;
} else {
textcontent.Append(xml.Value);
}
}
if (!hadElement)
objct = new Literal(textcontent.ToString(), lang, null);
}
}
storage.Add(new Statement(subject, predicate, objct, Meta));
if (ID != null) {
// In addition to adding the statement as normal, also
// add a reified statement.
Entity statement = GetNamedNode(Unrelativize("#" + ID));;
storage.Add(new Statement(statement, rdfType, rdfStatement, Meta));
storage.Add(new Statement(statement, rdfSubject, subject, Meta));
storage.Add(new Statement(statement, rdfPredicate, (Entity)predicate, Meta));
storage.Add(new Statement(statement, rdfObject, objct, Meta));
}
}
private bool IsRestrictedName(string name) {
if (name == NS.RDF + "RDF") return true;
if (name == NS.RDF + "Description") return true;
if (name == NS.RDF + "ID") return true;
if (name == NS.RDF + "about") return true;
if (name == NS.RDF + "parseType") return true;
if (name == NS.RDF + "resource") return true;
if (name == NS.RDF + "nodeID") return true;
if (name == NS.RDF + "datatype") return true;
return false;
}
private bool IsDeprecatedName(string name) {
if (name == NS.RDF + "bagID") return true;
if (name == NS.RDF + "aboutEach") return true;
if (name == NS.RDF + "aboutEachPrefix") return true;
return false;
}
private bool IsValidXmlName(string name) {
// I'm not sure what's supposed to be valid, but this is just for warnings anyway.
// CombiningChar and Extender characters are omitted.
if (name.Length == 0) return false;
char f = name[0];
if (!char.IsLetter(f) && f != '_') return false;
for (int i = 1; i < name.Length; i++) {
f = name[i];
if (!char.IsLetter(f) && !char.IsDigit(f) && f != '.' && f != '-' && f != '_')
return false;
}
return true;
}
private void OnError(string message) {
if (xml is IXmlLineInfo && ((IXmlLineInfo)xml).HasLineInfo()) {
IXmlLineInfo line = (IXmlLineInfo)xml;
message += ", line " + line.LineNumber + " col " + line.LinePosition;
}
throw new ParserException(message);
}
private new void OnWarning(string message) {
if (xml is IXmlLineInfo && ((IXmlLineInfo)xml).HasLineInfo()) {
IXmlLineInfo line = (IXmlLineInfo)xml;
message += ", line " + line.LineNumber + " col " + line.LinePosition;
}
base.OnWarning(message);
}
private class XmlBaseAwareReader : XmlReader {
XmlReader _reader;
Stack _bases = new Stack();
Uri _baseUri;
bool temp = false;
XmlResolver resolver = new XmlUrlResolver();
public XmlBaseAwareReader(XmlReader reader) {
_reader = reader;
if (_reader.BaseURI != "")
_baseUri = new Uri(_reader.BaseURI);
}
public override string BaseURI {
get { return _baseUri == null ? "" : _baseUri.AbsoluteUri; }
}
public override bool Read()
{
if (!_reader.Read()) return false;
if (temp) { // last element was an empty element
_baseUri = (Uri)_bases.Pop();
temp = false;
}
if (_reader.NodeType == XmlNodeType.EndElement)
_baseUri = (Uri)_bases.Pop();
if (_reader.NodeType == XmlNodeType.Element) {
string baseAttr = _reader.GetAttribute("xml:base");
if (_reader.IsEmptyElement && baseAttr == null) {
// do nothing : there is no EndElement, so no pop
} else {
_bases.Push(_baseUri); // even if no change, there will be a pop
if (baseAttr != null)
_baseUri = resolver.ResolveUri(_baseUri, baseAttr);
// if this is an empty element, there is no EndElement,
// so we must do a pop before processing the next node.
temp = _reader.IsEmptyElement;
}
}
return true;
}
public override void Close () { _reader.Close(); }
public override string GetAttribute (int i) { return _reader.GetAttribute(i); }
public override string GetAttribute (string name) { return _reader.GetAttribute(name); }
public override string GetAttribute (string localName, string namespaceName) { return _reader.GetAttribute(localName, namespaceName); }
public override bool IsStartElement () { return _reader.IsStartElement(); }
public override bool IsStartElement (string name) { return _reader.IsStartElement(name); }
public override bool IsStartElement (string localName, string namespaceName) { return _reader.IsStartElement(localName, namespaceName); }
public override string LookupNamespace (string prefix) { return _reader.LookupNamespace(prefix); }
public override void MoveToAttribute (int i) { _reader.MoveToAttribute(i); }
public override bool MoveToAttribute (string name) { return _reader.MoveToAttribute(name); }
public override bool MoveToAttribute (string localName, string namespaceName) { return _reader.MoveToAttribute(localName, namespaceName); }
public override XmlNodeType MoveToContent () { return _reader.MoveToContent(); }
public override bool MoveToElement () { return _reader.MoveToElement(); }
public override bool MoveToFirstAttribute () { return _reader.MoveToFirstAttribute(); }
public override bool MoveToNextAttribute () { return _reader.MoveToNextAttribute(); }
public override bool ReadAttributeValue () { return _reader.ReadAttributeValue(); }
public override string ReadElementString () { return _reader.ReadElementString(); }
public override string ReadElementString (string name) { return _reader.ReadElementString(name); }
public override string ReadElementString (string localName, string namespaceName) { return _reader.ReadElementString(localName, namespaceName); }
public override void ReadEndElement () { _reader.ReadEndElement(); }
public override string ReadInnerXml () { return _reader.ReadInnerXml(); }
public override string ReadOuterXml () { return _reader.ReadOuterXml(); }
public override void ReadStartElement () { _reader.ReadStartElement(); }
public override void ReadStartElement (string name) { _reader.ReadStartElement(name); }
public override void ReadStartElement (string localName, string namespaceName) { _reader.ReadStartElement(localName, namespaceName); }
public override string ReadString () { return _reader.ReadString(); }
public override void ResolveEntity () { _reader.ResolveEntity(); }
public override void Skip () { _reader.Skip(); }
public override int AttributeCount { get { return _reader.AttributeCount; } }
public override bool CanResolveEntity { get { return _reader.CanResolveEntity; } }
public override int Depth { get { return _reader.Depth; } }
public override bool EOF { get { return _reader.EOF; } }
public override bool HasAttributes { get { return _reader.HasAttributes; } }
public override bool HasValue { get { return _reader.HasValue; } }
public override bool IsDefault { get { return _reader.IsDefault; } }
public override bool IsEmptyElement { get { return _reader.IsEmptyElement; } }
public override string this [int i] { get { return _reader[i]; } }
public override string this [string name] { get { return _reader[name]; } }
public override string this [string localName, string namespaceName] { get { return _reader[localName, namespaceName]; } }
public override string LocalName { get { return _reader.LocalName; } }
public override string Name { get { return _reader.Name; } }
public override string NamespaceURI { get { return _reader.NamespaceURI; } }
public override XmlNameTable NameTable { get { return _reader.NameTable; } }
public override XmlNodeType NodeType { get { return _reader.NodeType; } }
public override string Prefix { get { return _reader.Prefix; } }
public override char QuoteChar { get { return _reader.QuoteChar; } }
public override ReadState ReadState { get { return _reader.ReadState; } }
public override string Value { get { return _reader.Value; } }
public override string XmlLang { get { return _reader.XmlLang; } }
public override XmlSpace XmlSpace { get { return _reader.XmlSpace; } }
}
}
}
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