Class RdfAParser

Class for reading RDF embedded as RDFa from within HTML web pages.

Inheritance

System.Object

RdfAParserBase<HtmlAgilityPack.HtmlDocument, HtmlAgilityPack.HtmlNode, HtmlAgilityPack.HtmlNode, HtmlAgilityPack.HtmlAttribute>

RdfAParser

Implements

IRdfReader

Inherited Members

RdfAParserBase<HtmlDocument, HtmlNode, HtmlNode, HtmlAttribute>.XHtmlVocabNamespace

RdfAParserBase<HtmlDocument, HtmlNode, HtmlNode, HtmlAttribute>.XHtmlPlusRdfADoctype

RdfAParserBase<HtmlDocument, HtmlNode, HtmlNode, HtmlAttribute>.XHtmlNamespace

RdfAParserBase<HtmlDocument, HtmlNode, HtmlNode, HtmlAttribute>.RdfANamespace

RdfAParserBase<HtmlDocument, HtmlNode, HtmlNode, HtmlAttribute>.XHtmlPlusRdfA11Version

RdfAParserBase<HtmlDocument, HtmlNode, HtmlNode, HtmlAttribute>.HtmlPlusRdfA11Version

RdfAParserBase<HtmlDocument, HtmlNode, HtmlNode, HtmlAttribute>.XHtmlPlusRdfA10Version

RdfAParserBase<HtmlDocument, HtmlNode, HtmlNode, HtmlAttribute>.HtmlPlusRdfA10Version

RdfAParserBase<HtmlDocument, HtmlNode, HtmlNode, HtmlAttribute>.Load(IGraph, StreamReader)

RdfAParserBase<HtmlDocument, HtmlNode, HtmlNode, HtmlAttribute>.Load(IGraph, TextReader)

RdfAParserBase<HtmlDocument, HtmlNode, HtmlNode, HtmlAttribute>.Load(IGraph, String)

RdfAParserBase<HtmlDocument, HtmlNode, HtmlNode, HtmlAttribute>.Load(IRdfHandler, StreamReader)

RdfAParserBase<HtmlDocument, HtmlNode, HtmlNode, HtmlAttribute>.Load(IRdfHandler, TextReader)

RdfAParserBase<HtmlDocument, HtmlNode, HtmlNode, HtmlAttribute>.Load(IRdfHandler, String)

RdfAParserBase<HtmlDocument, HtmlNode, HtmlNode, HtmlAttribute>.LoadAndParse(TextReader)

RdfAParserBase<HtmlDocument, HtmlNode, HtmlNode, HtmlAttribute>.HasAttribute(HtmlNode, String)

RdfAParserBase<HtmlDocument, HtmlNode, HtmlNode, HtmlAttribute>.GetAttribute(HtmlNode, String)

RdfAParserBase<HtmlDocument, HtmlNode, HtmlNode, HtmlAttribute>.SetAttribute(HtmlNode, String, String)

RdfAParserBase<HtmlDocument, HtmlNode, HtmlNode, HtmlAttribute>.GetBaseElement(HtmlDocument)

RdfAParserBase<HtmlDocument, HtmlNode, HtmlNode, HtmlAttribute>.IsXmlBaseIsPermissible(HtmlDocument)

RdfAParserBase<HtmlDocument, HtmlNode, HtmlNode, HtmlAttribute>.GetHtmlElement(HtmlDocument)

RdfAParserBase<HtmlDocument, HtmlNode, HtmlNode, HtmlAttribute>.ProcessDocument(RdfAParserContext<HtmlDocument>, RdfAEvaluationContext)

RdfAParserBase<HtmlDocument, HtmlNode, HtmlNode, HtmlAttribute>.GetAttributes(HtmlNode)

RdfAParserBase<HtmlDocument, HtmlNode, HtmlNode, HtmlAttribute>.GetAttributeName(HtmlAttribute)

RdfAParserBase<HtmlDocument, HtmlNode, HtmlNode, HtmlAttribute>.GetAttributeValue(HtmlAttribute)

RdfAParserBase<HtmlDocument, HtmlNode, HtmlNode, HtmlAttribute>.GetElementName(HtmlNode)

RdfAParserBase<HtmlDocument, HtmlNode, HtmlNode, HtmlAttribute>.GetChildren(HtmlNode)

RdfAParserBase<HtmlDocument, HtmlNode, HtmlNode, HtmlAttribute>.GetInnerText(HtmlNode)

RdfAParserBase<HtmlDocument, HtmlNode, HtmlNode, HtmlAttribute>.GetInnerHtml(HtmlNode)

RdfAParserBase<HtmlDocument, HtmlNode, HtmlNode, HtmlAttribute>.HasChildren(HtmlNode)

RdfAParserBase<HtmlDocument, HtmlNode, HtmlNode, HtmlAttribute>.IsTextNode(HtmlNode)

RdfAParserBase<HtmlDocument, HtmlNode, HtmlNode, HtmlAttribute>.ProcessElement(RdfAParserContext<HtmlDocument>, RdfAEvaluationContext, HtmlNode)

RdfAParserBase<HtmlDocument, HtmlNode, HtmlNode, HtmlAttribute>.GrabText(StringBuilder, HtmlNode)

RdfAParserBase<HtmlDocument, HtmlNode, HtmlNode, HtmlAttribute>.Warning

System.Object.Equals(System.Object)

System.Object.Equals(System.Object, System.Object)

System.Object.GetHashCode()

System.Object.GetType()

System.Object.MemberwiseClone()

System.Object.ReferenceEquals(System.Object, System.Object)

System.Object.ToString()

Namespace: VDS.RDF.Parsing

Assembly: dotNetRDF.dll

Syntax

public class RdfAParser : RdfAParserBase<HtmlDocument, HtmlNode, HtmlNode, HtmlAttribute>, IRdfReader

Remarks

The RDFa parser uses a HTML parser (Html Agility Pack) that is highly tolerant of real-world HTML and so is able to extract RDFa from pages that are not strictly valid HTML/XHTML.

Constructors

RdfAParser()

Creates a new RDFa Parser which will auto-detect which RDFa version to use (assumes 1.1 if none explicitly specified).

Declaration

public RdfAParser()

RdfAParser(RdfASyntax)

Creates a new RDFa Parser which will use the specified RDFa syntax.

Declaration

public RdfAParser(RdfASyntax syntax)

Parameters

Type	Name	Description
RdfASyntax	syntax	RDFa Syntax Version.

Methods

GetAttribute(HtmlNode, String)

Get the value of a particular attribute of an element.

Declaration

protected override string GetAttribute(HtmlNode element, string attributeName)

Parameters

Type	Name	Description
HtmlAgilityPack.HtmlNode	element
System.String	attributeName	The name of the attribute on the element.

Returns

Type	Description
System.String	The value of the attribute.

Overrides

VDS.RDF.Parsing.RdfAParserBase<HtmlAgilityPack.HtmlDocument, HtmlAgilityPack.HtmlNode, HtmlAgilityPack.HtmlNode, HtmlAgilityPack.HtmlAttribute>.GetAttribute(HtmlAgilityPack.HtmlNode, System.String)

GetAttributeName(HtmlAttribute)

Get the name of an attribute.

Declaration

protected override string GetAttributeName(HtmlAttribute attribute)

Parameters

Type	Name	Description
HtmlAgilityPack.HtmlAttribute	attribute

Returns

Type	Description
System.String

Overrides

VDS.RDF.Parsing.RdfAParserBase<HtmlAgilityPack.HtmlDocument, HtmlAgilityPack.HtmlNode, HtmlAgilityPack.HtmlNode, HtmlAgilityPack.HtmlAttribute>.GetAttributeName(HtmlAgilityPack.HtmlAttribute)

GetAttributes(HtmlNode)

Get all attributes of an element.

Declaration

protected override IEnumerable<HtmlAttribute> GetAttributes(HtmlNode element)

Parameters

Type	Name	Description
HtmlAgilityPack.HtmlNode	element

Returns

Type	Description
System.Collections.Generic.IEnumerable<HtmlAgilityPack.HtmlAttribute>

Overrides

VDS.RDF.Parsing.RdfAParserBase<HtmlAgilityPack.HtmlDocument, HtmlAgilityPack.HtmlNode, HtmlAgilityPack.HtmlNode, HtmlAgilityPack.HtmlAttribute>.GetAttributes(HtmlAgilityPack.HtmlNode)

GetAttributeValue(HtmlAttribute)

Get the value of an attribute.

Declaration

protected override string GetAttributeValue(HtmlAttribute attribute)

Parameters

Type	Name	Description
HtmlAgilityPack.HtmlAttribute	attribute

Returns

Type	Description
System.String

Overrides

VDS.RDF.Parsing.RdfAParserBase<HtmlAgilityPack.HtmlDocument, HtmlAgilityPack.HtmlNode, HtmlAgilityPack.HtmlNode, HtmlAgilityPack.HtmlAttribute>.GetAttributeValue(HtmlAgilityPack.HtmlAttribute)

GetBaseElement(HtmlDocument)

Get the base element of the specified document.

Declaration

protected override HtmlNode GetBaseElement(HtmlDocument document)

Parameters

Type	Name	Description
HtmlAgilityPack.HtmlDocument	document

Returns

Type	Description
HtmlAgilityPack.HtmlNode

Overrides

VDS.RDF.Parsing.RdfAParserBase<HtmlAgilityPack.HtmlDocument, HtmlAgilityPack.HtmlNode, HtmlAgilityPack.HtmlNode, HtmlAgilityPack.HtmlAttribute>.GetBaseElement(HtmlAgilityPack.HtmlDocument)

GetChildren(HtmlNode)

Return the children of an element (in order).

Declaration

protected override IEnumerable<HtmlNode> GetChildren(HtmlNode element)

Parameters

Type	Name	Description
HtmlAgilityPack.HtmlNode	element

Returns

Type	Description
System.Collections.Generic.IEnumerable<HtmlAgilityPack.HtmlNode>

Overrides

VDS.RDF.Parsing.RdfAParserBase<HtmlAgilityPack.HtmlDocument, HtmlAgilityPack.HtmlNode, HtmlAgilityPack.HtmlNode, HtmlAgilityPack.HtmlAttribute>.GetChildren(HtmlAgilityPack.HtmlNode)

GetElementName(HtmlNode)

Get the name of an element.

Declaration

protected override string GetElementName(HtmlNode element)

Parameters

Type	Name	Description
HtmlAgilityPack.HtmlNode	element

Returns

Type	Description
System.String

Overrides

VDS.RDF.Parsing.RdfAParserBase<HtmlAgilityPack.HtmlDocument, HtmlAgilityPack.HtmlNode, HtmlAgilityPack.HtmlNode, HtmlAgilityPack.HtmlAttribute>.GetElementName(HtmlAgilityPack.HtmlNode)

GetHtmlElement(HtmlDocument)

Get the html element of the document.

Declaration

protected override HtmlNode GetHtmlElement(HtmlDocument document)

Parameters

Type	Name	Description
HtmlAgilityPack.HtmlDocument	document

Returns

Type	Description
HtmlAgilityPack.HtmlNode

Overrides

VDS.RDF.Parsing.RdfAParserBase<HtmlAgilityPack.HtmlDocument, HtmlAgilityPack.HtmlNode, HtmlAgilityPack.HtmlNode, HtmlAgilityPack.HtmlAttribute>.GetHtmlElement(HtmlAgilityPack.HtmlDocument)

GetInnerHtml(HtmlNode)

Get the HTML contained within an element as a string.

Declaration

protected override string GetInnerHtml(HtmlNode element)

Parameters

Type	Name	Description
HtmlAgilityPack.HtmlNode	element

Returns

Type	Description
System.String

Overrides

VDS.RDF.Parsing.RdfAParserBase<HtmlAgilityPack.HtmlDocument, HtmlAgilityPack.HtmlNode, HtmlAgilityPack.HtmlNode, HtmlAgilityPack.HtmlAttribute>.GetInnerHtml(HtmlAgilityPack.HtmlNode)

GetInnerText(HtmlNode)

Get the inner text of an element or a text node.

Declaration

protected override string GetInnerText(HtmlNode node)

Parameters

Type	Name	Description
HtmlAgilityPack.HtmlNode	node

Returns

Type	Description
System.String

Overrides

VDS.RDF.Parsing.RdfAParserBase<HtmlAgilityPack.HtmlDocument, HtmlAgilityPack.HtmlNode, HtmlAgilityPack.HtmlNode, HtmlAgilityPack.HtmlAttribute>.GetInnerText(HtmlAgilityPack.HtmlNode)

GrabText(StringBuilder, HtmlNode)

Get the text content of a node and add it to the provided output buffer.

Declaration

protected override void GrabText(StringBuilder output, HtmlNode node)

Parameters

Type	Name	Description
System.Text.StringBuilder	output
HtmlAgilityPack.HtmlNode	node

Overrides

VDS.RDF.Parsing.RdfAParserBase<HtmlAgilityPack.HtmlDocument, HtmlAgilityPack.HtmlNode, HtmlAgilityPack.HtmlNode, HtmlAgilityPack.HtmlAttribute>.GrabText(System.Text.StringBuilder, HtmlAgilityPack.HtmlNode)

HasAttribute(HtmlNode, String)

Determine if an element has a particular attribute.

Declaration

protected override bool HasAttribute(HtmlNode element, string attributeName)

Parameters

Type	Name	Description
HtmlAgilityPack.HtmlNode	element
System.String	attributeName	The name of the attribute to check for.

Returns

Type	Description
System.Boolean	True if the element has an attribute named attributeName, false otherwise.

Overrides

VDS.RDF.Parsing.RdfAParserBase<HtmlAgilityPack.HtmlDocument, HtmlAgilityPack.HtmlNode, HtmlAgilityPack.HtmlNode, HtmlAgilityPack.HtmlAttribute>.HasAttribute(HtmlAgilityPack.HtmlNode, System.String)

HasChildren(HtmlNode)

Determine if an element has children.

Declaration

protected override bool HasChildren(HtmlNode element)

Parameters

Type	Name	Description
HtmlAgilityPack.HtmlNode	element

Returns

Type	Description
System.Boolean	True if the element has children, false otherwise.

Overrides

VDS.RDF.Parsing.RdfAParserBase<HtmlAgilityPack.HtmlDocument, HtmlAgilityPack.HtmlNode, HtmlAgilityPack.HtmlNode, HtmlAgilityPack.HtmlAttribute>.HasChildren(HtmlAgilityPack.HtmlNode)

IsTextNode(HtmlNode)

Determine if a node in the parsed Html document tree is a text node.

Declaration

protected override bool IsTextNode(HtmlNode node)

Parameters

Type	Name	Description
HtmlAgilityPack.HtmlNode	node

Returns

Type	Description
System.Boolean	True if node is a text node, false otherwise.

Overrides

VDS.RDF.Parsing.RdfAParserBase<HtmlAgilityPack.HtmlDocument, HtmlAgilityPack.HtmlNode, HtmlAgilityPack.HtmlNode, HtmlAgilityPack.HtmlAttribute>.IsTextNode(HtmlAgilityPack.HtmlNode)

IsXmlBaseIsPermissible(HtmlDocument)

Deterine if the HTML document can have an xml:base element.

Declaration

protected override bool IsXmlBaseIsPermissible(HtmlDocument document)

Parameters

Type	Name	Description
HtmlAgilityPack.HtmlDocument	document

Returns

Type	Description
System.Boolean

Overrides

VDS.RDF.Parsing.RdfAParserBase<HtmlAgilityPack.HtmlDocument, HtmlAgilityPack.HtmlNode, HtmlAgilityPack.HtmlNode, HtmlAgilityPack.HtmlAttribute>.IsXmlBaseIsPermissible(HtmlAgilityPack.HtmlDocument)

LoadAndParse(TextReader)

Parse the input stream as an HTML document.

Declaration

protected override HtmlDocument LoadAndParse(TextReader input)

Parameters

Type	Name	Description
System.IO.TextReader	input

Returns

Type	Description
HtmlAgilityPack.HtmlDocument

Overrides

VDS.RDF.Parsing.RdfAParserBase<HtmlAgilityPack.HtmlDocument, HtmlAgilityPack.HtmlNode, HtmlAgilityPack.HtmlNode, HtmlAgilityPack.HtmlAttribute>.LoadAndParse(System.IO.TextReader)

ProcessDocument(RdfAParserContext<HtmlDocument>, RdfAEvaluationContext)

Process the content of an HTML document.

Declaration

protected override void ProcessDocument(RdfAParserContext<HtmlDocument> context, RdfAEvaluationContext evalContext)

Parameters

Type	Name	Description
RdfAParserContext<HtmlAgilityPack.HtmlDocument>	context
RdfAEvaluationContext	evalContext

Overrides

VDS.RDF.Parsing.RdfAParserBase<HtmlAgilityPack.HtmlDocument, HtmlAgilityPack.HtmlNode, HtmlAgilityPack.HtmlNode, HtmlAgilityPack.HtmlAttribute>.ProcessDocument(VDS.RDF.Parsing.Contexts.RdfAParserContext<HtmlAgilityPack.HtmlDocument>, VDS.RDF.Parsing.Contexts.RdfAEvaluationContext)

SetAttribute(HtmlNode, String, String)

Set the value of a particular attribute of an element.

Declaration

protected override void SetAttribute(HtmlNode element, string attributeName, string value)

Parameters

Type	Name	Description
HtmlAgilityPack.HtmlNode	element
System.String	attributeName	The name of the attribute to set/update.
System.String	value	The new value for the attribute.

Overrides

VDS.RDF.Parsing.RdfAParserBase<HtmlAgilityPack.HtmlDocument, HtmlAgilityPack.HtmlNode, HtmlAgilityPack.HtmlNode, HtmlAgilityPack.HtmlAttribute>.SetAttribute(HtmlAgilityPack.HtmlNode, System.String, System.String)

Implements

IRdfReader

Extension Methods

Extensions.AsEnumerable<T>(T)