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318 > Knowledge Graphs and Linked Data > Flashcards

Knowledge Graphs and Linked Data Flashcards

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1
Q

What is the purpose of publishing KG data on the web?

A

To make it publicly available and accessible.

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2
Q

What does Linked Open Data aim to overcome?

A

Merging siloed data.

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3
Q

What is the main idea behind Linked Data?

A

Use the Web to create a global dataspace for consistent data sharing.

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4
Q

What technology is used to publish structured data on the Web in Linked Data?

A

RDF (Resource Description Framework).

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5
Q

Why are links stated explicitly between data items?

A

To define relationships and properties clearly across datasets.

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6
Q

Why not just use CSV, XML, or relational data?

A

Because Linked Data focuses on shared semantics, not just syntax.

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7
Q

What level of interpretability does Linked Data aim for?

A

Semantic level, not surface-level parsing.

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8
Q

What is the Web-based model Linked Data relies on?

A

A data (RDF) and naming (URI) model.

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9
Q

Why use HTTP-based identifiers?

A

To enable dereferencing via web mechanisms like GET and POST.

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10
Q

What do dereferenced URIs return?

A

Useful structured information in standard formats like RDF.

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11
Q

What is Linked Data trying to express between resources?

A

Relations and links accessible via IRIs.

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12
Q

What are the 4 Linked Data principles?

A
  1. Use URIs to identify things; 2. Use HTTP URIs; 3. Provide useful info; 4. Link to other URIs where possible
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13
Q

What should URIs be used to name?

A

Everything including tangible and abstract concepts.

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14
Q

What does using URIs for all things extend?

A

The scope of the Web to encompass all objects and concepts.

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15
Q

Why must a URI be dereferenceable?

A

To retrieve useful data using web protocols.

Some URIs don’t point to any specific data, which is not ideal.

When you do an HTTP GET/type a URL into your browser, a result is returned, an RDF description in the best case!

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16
Q

What protocol is used to dereference URIs?

A

HTTP.

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17
Q

Are dereferenceable URIs mandatory in Linked Data?

A

No, they are recommended but not required.

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18
Q

What should dereferenced URIs provide?

A

RDF descriptions using standard formats.

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19
Q

Why is RDF used as a data model?

A

Because it’s a simple, graph-based model for structured data.

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20
Q

What does linking to other URIs help with?

A

Discovery of related data on the Web.

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21
Q

How are links between things expressed?

A

With RDF properties that describe the relationship type.

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22
Q

What happens when RDF links connect different namespaces?

A

They connect resources in different datasets.

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23
Q

What is the benefit of connecting data sets?

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A

Creating a single global dataspace for navigation and integration.

24
Q

How does Linked Data differ from the classic Web?

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A

It links real-world concepts, not just documents.

25
What is the significance of using shared web mechanisms?
They help software navigate linked resources like humans navigate the Web.
26
What does Tim berners lee mean by Open Data?
Data published with liberal licenses, freely usable and shareable.
27
What is Linked Open Data?
The combination of Linked Data principles with Open Data publication.
28
Why is Linked Open Data important?
It helps debunk misinformation by ensuring open and connected data.
29
What is DBPedia?
An RDFised version of Wikipedia, serving as a central dataset.
30
What are some big Linked Data datasets?
FOAF, US Census data.
31
How are datasets categorised?
By colour representing shared subjects or characteristics.
32
What does FOAF describe?
Persons, their properties, and their relationships.
33
What is the transport mechanism for Linked Data?
HTTP protocol.
34
What is used to represent data and the model in Linked Data?
RDF
35
What identifies resources in Linked Data?
URIs.
36
What defines the semantics of schemas?
Vocabularies and ontologies.
37
What query language is used in Linked Data?
SPARQL
38
What aggregates content from different namespaces?
Mashups
39
What are some native RDF triplestores?
Sesame, Jena, Owlim.
40
What do Linked Data browsers do?
Explore datasets and navigate between them.
41
What are Linked Data mashups?
Sites that combine multiple Linked Data sources.
42
What is the purpose of Linked Data search engines?
To search for Linked Data.
43
What are persistent URIs?
URIs that cannot be changed, ensuring consistent identification of data.
44
What is a downside of current Linked Data growth?
Some data is irregularly updated or already available in other formats.
45
Why is API availability a concern in Linked Data?
APIs may not support RDF or may limit access to the data.
46
What risk arises from not linking published data?
Creating RDF silos.
47
What do we need more of to support Linked Data?
Applications, tools, and openly licensed data with provenance.
48
What are some open issues in Linked Data applications?
Integration difficulties, data discovery, and interface usability.
49
What is the 4-step process to create Linked Data?
1) Add semantics to the data 2) Model general world knowledge 3) Acquire new knowledge from inference 4) Query consistent information from different source
50
What is step 1 in creating Linked Data?
Add semantics to the data. Can go further by identifying classes of individuals of the same type and relationships existing between entities in the domain and individuals.
51
What is step 2 in creating Linked Data?
Model general world knowledge Now have instances of classes and relationships between classes.
52
What is step 3 in creating Linked Data?
Acquire new knowledge through inference using RDFs/OWL.
53
Give an example of inference from RDFs
If Shakespeare is a poet and all poets are writers, Shakespeare is a writer.
54
What is step 4 in creating Linked Data?
Query information from different sources.
55
Give an example query for Linked Data
List all persons from Wikipedia, IMDB, Wikidata, or British Library.
56
What is an example of a co-authorship query?
List all authors who co-authored with a co-author of Paul Erdoss.

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