Account
Sign in to you account
Sign In Sign Up

How to Get Only Url Results In Sparql Query?

5 minutes read

To get only URL results in a SPARQL query, you can use the FILTER function to filter out non-URL results. You can specify that the result should be of type URI by using the datatype http://www.w3.org/2001/XMLSchema#anyURI. This will only return results that are valid URLs. Additionally, you can use regular expressions to further refine the results and ensure that only URLs are returned. By combining these techniques, you can effectively filter out non-URL results in a SPARQL query.

Best Cloud Hosting Services of November 2024

1
Vultr

Rating is 5 out of 5

Vultr

  • Ultra-fast Intel Core Processors
  • Great Uptime and Support
  • High Performance and Cheap Cloud Dedicated Servers
Get Started Now
2
Digital Ocean

Rating is 4.9 out of 5

Digital Ocean

  • Professional hosting starting at $5 per month
  • Remarkable Performance
Get Started Now
3
AWS

Rating is 4.8 out of 5

AWS

Get Started Now
4
Cloudways

Rating is 4.7 out of 5

Cloudways

Get Started Now


How to refine my SPARQL query to return only URLs?

To refine your SPARQL query to return only URLs, you can use the FILTER clause with the REGEX function to filter out results that do not match a URL pattern.


Here is an example of how you can modify your query:

1
2
3
4
5

SELECT ?url
WHERE {
  ?s ?p ?url .
  FILTER(REGEX(?url, "^http://|^https://"))
}


In this query, we are selecting only the ?url variable, and using the FILTER clause with the REGEX function to match only URLs that start with "http://" or "https://". This will exclude any results that do not match this URL pattern.


What is the syntax for filtering URL results in SPARQL?

To filter URL results in SPARQL, you can use the FILTER clause along with the regex function. Here is the syntax for filtering URL results in SPARQL:

1
2
3
4
5

SELECT ?url
WHERE {
  ?s ?p ?url .
  FILTER regex(str(?url), "example.com")
}


In this example, we are filtering results where the URL contains "example.com". You can replace "example.com" with any other URL pattern you want to filter.


What is the technique for narrowing down SPARQL results to include only URLs?

One technique for narrowing down SPARQL results to include only URLs is to use the FILTER clause with a regular expression pattern that matches URLs.


For example, you can use the following SPARQL query to retrieve all resources that have a URL property:

1
2
3
4

SELECT ?resource WHERE {
  ?resource ?property ?value .
  FILTER(regex(str(?value), "^(http|https)://.*"))
}


In this query, the FILTER clause uses the regex function to filter out only those values that start with "http://" or "https://", which are common patterns for URLs.


This will return only resources that have a URL property, excluding other types of values such as literals or blank nodes.


How to refine my SPARQL query to show only web addresses?

To refine your SPARQL query to show only web addresses, you can specify a filter condition that checks if the value is a valid URL format. Here is an example of how you can modify your SPARQL query:

1
2
3
4
5

SELECT ?webAddress
WHERE {
  ?s <http://xmlns.com/foaf/0.1/homepage> ?webAddress .
  FILTER(STRSTARTS(str(?webAddress), "http://") || STRSTARTS(str(?webAddress), "https://"))
}


In this query, we are selecting all web page addresses (?webAddress) where the value for the predicate <http://xmlns.com/foaf/0.1/homepage> starts with "http://" or "https://", which indicates that it is a web address. By using the FILTER condition, we are filtering out any values that do not meet this criteria.


What keyword can I use to target URLs in a SPARQL query?

The keyword "FILTER" can be used to target URLs in a SPARQL query.

Facebook Twitter LinkedIn Telegram Whatsapp Pocket

Related Posts:

How to Limit Count(*) For Sparql?
In SPARQL, the COUNT() function can be used to count the number of results returned by a query. However, there is no built-in way to limit the count of results directly in SPARQL. One common workaround is to combine the COUNT() function with the LIMIT clause i...
What Is A Valid Uri In Sparql?
In SPARQL, a valid URI is a Uniform Resource Identifier that uniquely identifies a resource, such as a web page, a file, or a concept. URIs in SPARQL are used to represent entities in a dataset, such as subjects, predicates, and objects in triples. URIs must f...
How to Convert to String Search In Sparql?
In SPARQL, you can convert a search result into a string using the STR function. This function allows you to convert a variable or literal value into a string representation. You can use the STR function in combination with other SPARQL functions and operators...
How to Escape Brackets In Sparql String?
In SPARQL, to escape brackets in a string, you can use the backslash character &#34;&#34; before the brackets. This way, the brackets will be treated as regular characters and not as special characters in the query. For example, if you want to include brackets...
How to Select Distinct on Multiple Columns In Sparql?
In SPARQL, you can use the DISTINCT keyword to select distinct results based on multiple columns. To select distinct results on multiple columns, you need to specify the columns you want to be distinct in the SELECT statement, separated by commas. For example,...
How to Remove Particular Query From Url In Rust?
To remove a particular query parameter from a URL in Rust, you can use the url crate to parse the URL and manipulate its components. Here is a simple example of how you can achieve this: use url::Url; fn remove_query_param(url_str: &amp;str, param_name: &amp;...