RDFa 1.1 Primer. We begin the introduction to RDFa by using a subset of all the possibilities called RDFa Lite 1.1 [rdfa-lite].
The goal, when defining that subset, was to define a set of possibilities that can be applied to most simple to moderate structured data markup tasks, without burdening the authors with additional complexities. Many Web authors will not need to use more than this minimal subset. 2.1.1 The First Steps: Adding Machine-Readable Hints to Web Pages Consider Alice, a blogger who publishes a mix of professional and personal articles at We will construct markup examples to illustrate how Alice can use RDFa. A more complete markup of these examples is available on a dedicated page. 2.1.1.1 Hints on Social Networking Sites Alice publishes a blog and would like to provide extra structural information on her pages like the publication date or the title.
Example 1 <html><head> ... This information is, however, aimed at humans only; computers need some sophisticated methods to extract it. Note. 5 Microdata — HTML 5. A vocabulary and associated APIs for HTML and XHTML This is revision 1.2852.
Microdata Status: First draft. ISSUE-76 (Microdata/RDFa) blocks progress to Last Call 5.1 Introduction 5.1.1 Overview This section is non-normative. Sometimes, it is desirable to annotate content with specific machine-readable labels, e.g. to allow generic scripts to provide services that are customised to the page, or to enable content from a variety of cooperating authors to be processed by a single script in a consistent manner. For this purpose, authors can use the microdata features described in this section. 5.1.2 The basic syntax At a high level, microdata consists of a group of name-value pairs. To create an item, the item attribute is used. To add a property to an item, the itemprop attribute is used on one of the item's descendants. Here there are two items, each of which have the property "name": <div item><p>My name is <span itemprop="name">Elizabeth</span>.
Properties generally have values that are strings. The. The RDF Data Cube Vocabulary. An instance of an RDF Data Cube should conform to a set of integrity constraints which we define in this section. well-formed RDF Data Cube is an a RDF graph describing one or more instances of qb:DataSet for which each of the integrity checks defined here passes. well-formed abbreviated RDF Data Cube is an a RDF graph which, when expanded using the normalization algorithm, yields a well-formed RDF Data Cube. 11.1 Integrity constraints Each integrity constraint is expressed as narrative prose and, where possible, a SPARQL [sparql11-query] ASK query or query template.
Using SPARQL queries to express the integrity constraints does not imply that integrity checking must be performed this way. Each integrity constraint query assumes the following set of prefix bindings: PREFIX rdf: < PREFIX rdfs: < PREFIX skos: < PREFIX qb: < PREFIX xsd: < PREFIX owl: < The complete set of constraints is listed below.
IC-0. IC-1. Every qb:Observation has exactly one associated qb:DataSet.