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FUNCTIONS_AND_MAGIC_PROPERTIES.md

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Functions and magic properties

SPARQL Anything provides a number of magical functions and properties to facilitate the users in querying the sources and constructing knowledge graphs.

NOTE: SPARQL Anything is built on Apache Jena, see a list of supported functions on the Apache Jena documentation.

Name Function/Magic Property Input Output Description
fx:anySlot Magic Property - - This property matches the RDF container membership properties (e.g. rdf:_1, rdf:_2 ...).
fx:cardinal(?a) Function Container membership property Integer fx:cardinal(?a) returns the corresponding cardinal integer from ?a (rdf:_24 -> 24)
fx:isContainerMembershipProperty(?p) Function Container membership property Boolean fx:isContainerMembershipProperty(?p) returns true if the node passed as parameter is a container membership property (rdf:_24 -> true)
fx:before(?a, ?b) Function Container membership properties Boolean fx:before(?a, ?b) returns true if ?a and ?b are container membership properties and ?a is lower than ?b, false otherwise
fx:after(?a, ?b) Function Container membership property Boolean fx:after(?a, ?b) returns true if ?a and ?b are container membership properties and ?a is higher than ?b, false otherwise
fx:previous(?a) Function Container membership property Container membership property fx:previous(?a) returns the container membership property that preceeds ?a (rdf:_2 -> rdf:_1)
fx:next(?b) Function Container membership property Container membership property fx:next(?b) returns the container membership property that succeedes ?b (rdf:_1 -> rdf:_2)
fx:forward(?a, ?b) Function Container membership property, Integer Container membership property fx:forward(?a, ?b) returns the container membership property that follows ?a of ?b steps (rdf:_2, 5 -> rdf:_7)
fx:backward(?a, ?b) Function Container membership property, Integer Container membership property fx:backward(?a, ?b) returns the container membership property that preceeds ?a of ?b steps (rdf:_24, 4 -> rdf:_20)
fx:String.startsWith(?stringA, ?stringB) Function String, String Boolean fx:String.startsWith wraps java.lang.String.startsWith
fx:String.endsWith(?stringA, ?stringB) Function String, String Boolean fx:String.endsWith wraps java.lang.String.endsWith
fx:String.indexOf(?stringA, ?stringB) Function String, String Integer fx:String.indexOf wraps java.lang.String.indexOf
fx:String.lastIndexOf(?stringA, ?stringB) Function String, String Integer fx:String.lastIndexOf wraps java.lang.String.lastIndexOf
fx:String.substring(?string) Function String, Integer, (Integer?) String fx:String.substring wraps java.lang.String.substring
fx:String.toLowerCase(?string) Function String String fx:String.toLowerCase wraps java.lang.String.toLowerCase
fx:String.toUpperCase(?string) Function String String fx:String.toUpperCase wraps java.lang.String.toUpperCase
fx:String.replace(?string, ?characterA, ?characterB) Function String, Character, Character String fx:String.replace wraps java.lang.String.replace
fx:String.trim(?string) Function String String fx:String.trim wraps java.lang.String.trim
fx:String.stripLeading(?string) Function String String fx:String.stripLeading wraps java.lang.String.stripLeading
fx:String.stripTrailing(?string) Function String String fx:String.stripTrailing wraps java.lang.String.stripTrailing
fx:String.removeTags(?string) Function String String fx:String.removeTags removes the XML tags from the input string
fxWordUtils.capitalize(?string) Function String String WordUtils.capitalize wraps org.apache.commons.text.WordUtils.capitalize
fxWordUtils.capitalizeFully(?string) Function String String fx:WordUtils.capitalizeFully wraps org.apache.commons.text.WordUtils.capitalizeFully
fx:WordUtils.initials(?string) Function String String fx:WordUtils.initials wraps org.apache.commons.text.WordUtils.initials
fx:WordUtils.swapCase(?string) Function String String fx:WordUtils.swapCase wraps org.apache.commons.text.WordUtils.swapCase
fx:WordUtils.uncapitalize(?string) Function String String fx:WordUtils.uncapitalize wraps org.apache.commons.text.WordUtils.uncapitalize
fx:DigestUtils.md2Hex(?string) Function String String fx:DigestUtils.md2Hex wraps org.apache.commons.codec.digest.DigestUtils.md2Hex
fx:DigestUtils.md5Hex(?string) Function String String fx:DigestUtils.md5Hex wraps org.apache.commons.codec.digest.DigestUtils.md5Hex
fx:DigestUtils.sha1Hex(?string) Function String String fx:DigestUtils.sha1Hex wraps org.apache.commons.codec.digest.DigestUtils.sha1Hex
fx:DigestUtils.sha256Hex(?string) Function String String fx:DigestUtils.sha256Hex wraps org.apache.commons.codec.digest.DigestUtils.sha256Hex
fx:DigestUtils.sha384Hex(?string) Function String String fx:DigestUtils.sha384Hex wraps org.apache.commons.codec.digest.DigestUtils.sha384Hex
fx:DigestUtils.sha512Hex(?string) Function String String fx:DigestUtils.sha512Hex wraps org.apache.commons.codec.digest.DigestUtils.sha512Hex
fx:URLEncoder.encode(?string) Function String, String String fx:URLEncoder.encode wraps java.net.URLEncoder.encode
fx:URLDecoder.decode(?string) Function String, String String fx:URLDecoder.decode wraps java.net.URLDecoder.decode
fx:serial(?a ... ?n) Function Any sequence of nodes Integer The function fx:serial (?a ... ?n) generates an incremental number using the arguments as reference counters. For example, calling fx:serial("x") two times will generate 1 and then 2. Instead, calling fx:serial(?x) multiple times will generate sequential numbers for each value of ?x.
fx:entity(?a ... ?n) Function Any sequence of nodes URI node The function fx:entity (?a ... ?n) accepts a list of arguments and performs concatenation and automatic casting to string. Container membership properties (rdf:_1,rdf:_2,...) are cast to numbers and then to strings ("1","2").
fx:literal(?a, ?b) Function String, (URI or language code) Literal node The function fx:literal( ?a , ?b ) builds a literal from the string representation of ?a, using ?b either as a typed literal (if a IRI is given) or a lang code (if a string of length of two is given).
fx:bnode(?a) Function Any node Blank node The function fx:bnode( ?a) builds a blank node enforcing the node value as local identifier. This is useful when multiple construct templates are populated with bnode generated on different query solutions but we want them to be joined in the output RDF graph. Apparently, the standard function BNODE does generate a new node for each query solution (see issue #273 for an explanatory case).
fx:LevenshteinDistance(?n1, ?n2) Function String, String Integer The function fx:LevenshteinDistance(?n1, ?n2) computes the Levenshtein Distance between ?n1 and ?n2 (see #182).
fx:CosineDistance(?n1, ?n2) Function String, String Double The function fx:CosineDistance(?n1, ?n2) computes the Cosine Distance between ?n1 and ?n2 (see #182).
fx:JaccardDistance(?n1, ?n2) Function String, String Double The function fx:JaccardDistance(?n1, ?n2) computes the Jaccard Distance between ?n1 and ?n2 (see #182).
fx:JaroWinklerDistance(?n1, ?n2) Function String, String Double The function fx:JaroWinklerDistance(?n1, ?n2) computes the Jaro-Winkler Distance between ?n1 and ?n2 (see #182).
fx:LongestCommonSubsequenceDistance(?n1, ?n2) Function String, String Integer The function fx:LongestCommonSubsequenceDistance(?n1, ?n2) computes the Longest Common Subsequence Distance between ?n1 and ?n2 (see #182).
fx:HammingDistance(?n1, ?n2) Function String, String Integer The function fx:HammingDistance(?n1, ?n2) computes the Hamming Distance between ?n1 and ?n2 (see #182).
fx:QGramDistance(?n1, ?n2) Function String, String Double The function fx:QGramDistance(?n1, ?n2) computes the QGram Distance between ?n1 and ?n2 (see #394).

Working with sequences

fx:anySlot

The execution engine is sensible to the magic property fx:anySlot.

This property matches the RDF container membership properties (e.g. rdf:_1, rdf:_2 ...).

Example

Query

PREFIX  xsd:  <http://www.w3.org/2001/XMLSchema#>
PREFIX  xyz:  <http://sparql.xyz/facade-x/data/>
PREFIX  fx:   <http://sparql.xyz/facade-x/ns/>
PREFIX  rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#>

SELECT  ?slot
WHERE
  { SERVICE <x-sparql-anything:>
      { fx:properties
                  fx:content     "[1,2,3]" ;
                  fx:media-type  "application/json" .
        ?s        fx:anySlot     ?slot
      }
  }

Result

-----------------------------------------------
| slot                                        |
===============================================
| "1"^^<http://www.w3.org/2001/XMLSchema#int> |
| "2"^^<http://www.w3.org/2001/XMLSchema#int> |
| "3"^^<http://www.w3.org/2001/XMLSchema#int> |
-----------------------------------------------

Functions on container membership properties

The system supports the following functions on container membership properties (See issue 78):

fx:cardinal

fx:cardinal(?a) returns the corresponding cardinal integer from ?a (rdf:_24 -> 24)

Input

Container membership property

Output

Integer

Example

PREFIX  xsd:  <http://www.w3.org/2001/XMLSchema#>
PREFIX  xyz:  <http://sparql.xyz/facade-x/data/>
PREFIX  fx:   <http://sparql.xyz/facade-x/ns/>
PREFIX  rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#>

SELECT  ?slot (fx:cardinal(?p) AS ?cardinal)
WHERE
  { SERVICE <x-sparql-anything:>
      { fx:properties
                  fx:content     "[1,2,3]" ;
                  fx:media-type  "application/json" .
        ?s        ?p             ?slot
        FILTER ( ?p != rdf:type )
      }
  }

Result

----------------------------------------------------------
| slot                                        | cardinal |
==========================================================
| "1"^^<http://www.w3.org/2001/XMLSchema#int> | 1        |
| "2"^^<http://www.w3.org/2001/XMLSchema#int> | 2        |
| "3"^^<http://www.w3.org/2001/XMLSchema#int> | 3        |
----------------------------------------------------------

fx:isContainerMembershipProperty

fx:isContainerMembershipProperty(?p) returns true if the node passed as parameter is a container membership property (rdf:_24 -> true)

Input

Container membership property

Output

Boolean

Example

PREFIX  rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX  fx:   <http://sparql.xyz/facade-x/ns/>

SELECT  ?resultTrue ?resultFalse
WHERE
  { BIND(fx:isContainerMembershipProperty(rdf:_42) AS ?resultTrue)
    BIND(fx:isContainerMembershipProperty(42) AS ?resultFalse)
  }

Result

----------------------------
| resultTrue | resultFalse |
============================
| true       | false       |
----------------------------

fx:before

fx:before(?a, ?b) returns true if ?a and ?b are container membership properties and ?a is lower than ?b, false otherwise

Input

Container membership properties

Output

Boolean

Example

PREFIX  xsd:  <http://www.w3.org/2001/XMLSchema#>
PREFIX  xyz:  <http://sparql.xyz/facade-x/data/>
PREFIX  fx:   <http://sparql.xyz/facade-x/ns/>
PREFIX  rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#>

SELECT  (fx:before(?p1, ?p2) AS ?p1_before_p2) (fx:before(?p2, ?p1) AS ?p2_before_p1) (fx:before(?p1, ?p1) AS ?p1_before_p1)
WHERE
  { SERVICE <x-sparql-anything:>
      { fx:properties
                  fx:content     "[1,2,3]" ;
                  fx:media-type  "application/json" .
        ?s        ?p1            1 ;
                  ?p2            2
      }
  }

Result

----------------------------------------------
| p1_before_p2 | p2_before_p1 | p1_before_p1 |
==============================================
| true         | false        | false        |
----------------------------------------------

fx:after

fx:after(?a, ?b) returns true if ?a and ?b are container membership properties and ?a is higher than ?b, false otherwise

Input

Container membership properties

Output

Boolean

Example

PREFIX  xsd:  <http://www.w3.org/2001/XMLSchema#>
PREFIX  xyz:  <http://sparql.xyz/facade-x/data/>
PREFIX  fx:   <http://sparql.xyz/facade-x/ns/>
PREFIX  rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#>

SELECT  (fx:after(?p1, ?p2) AS ?p1_after_p2) (fx:after(?p2, ?p1) AS ?p2_after_p1) (fx:after(?p1, ?p1) AS ?p1_after_p1)
WHERE
  { SERVICE <x-sparql-anything:>
      { fx:properties
                  fx:content     "[1,2,3]" ;
                  fx:media-type  "application/json" .
        ?s        ?p1            1 ;
                  ?p2            2
      }
  }

Result

-------------------------------------------
| p1_after_p2 | p2_after_p1 | p1_after_p1 |
===========================================
| false       | true        | false       |
-------------------------------------------

fx:previous

fx:previous(?a) returns the container membership property that preceeds ?a (rdf:_2 -> rdf:_1)

Input

Container membership property

Output

Container membership property

Example

PREFIX  xsd:  <http://www.w3.org/2001/XMLSchema#>
PREFIX  xyz:  <http://sparql.xyz/facade-x/data/>
PREFIX  fx:   <http://sparql.xyz/facade-x/ns/>
PREFIX  rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#>

SELECT  ?slot ?p (fx:previous(?p) AS ?previous)
WHERE
  { SERVICE <x-sparql-anything:>
      { fx:properties
                  fx:content     "[1,2,3]" ;
                  fx:media-type  "application/json" .
        ?s        ?p             ?slot
        FILTER ( ?p != rdf:type )
      }
  }

Result

---------------------------------------------------------------------------------------------------------------------------------------------------
| slot                                        | p                                               | previous                                        |
===================================================================================================================================================
| "1"^^<http://www.w3.org/2001/XMLSchema#int> | <http://www.w3.org/1999/02/22-rdf-syntax-ns#_1> |                                                 |
| "2"^^<http://www.w3.org/2001/XMLSchema#int> | <http://www.w3.org/1999/02/22-rdf-syntax-ns#_2> | <http://www.w3.org/1999/02/22-rdf-syntax-ns#_1> |
| "3"^^<http://www.w3.org/2001/XMLSchema#int> | <http://www.w3.org/1999/02/22-rdf-syntax-ns#_3> | <http://www.w3.org/1999/02/22-rdf-syntax-ns#_2> |
---------------------------------------------------------------------------------------------------------------------------------------------------

fx:next

fx:next(?b) returns the container membership property that succeedes ?b (rdf:_1 -> rdf:_2)

Input

Container membership property

Output

Container membership property

Example

PREFIX  xsd:  <http://www.w3.org/2001/XMLSchema#>
PREFIX  xyz:  <http://sparql.xyz/facade-x/data/>
PREFIX  fx:   <http://sparql.xyz/facade-x/ns/>
PREFIX  rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#>

SELECT  ?slot ?p (fx:next(?p) AS ?next)
WHERE
  { SERVICE <x-sparql-anything:>
      { fx:properties
                  fx:content     "[1,2,3]" ;
                  fx:media-type  "application/json" .
        ?s        ?p             ?slot
        FILTER ( ?p != rdf:type )
      }
  }

Result

---------------------------------------------------------------------------------------------------------------------------------------------------
| slot                                        | p                                               | next                                            |
===================================================================================================================================================
| "1"^^<http://www.w3.org/2001/XMLSchema#int> | <http://www.w3.org/1999/02/22-rdf-syntax-ns#_1> | <http://www.w3.org/1999/02/22-rdf-syntax-ns#_2> |
| "2"^^<http://www.w3.org/2001/XMLSchema#int> | <http://www.w3.org/1999/02/22-rdf-syntax-ns#_2> | <http://www.w3.org/1999/02/22-rdf-syntax-ns#_3> |
| "3"^^<http://www.w3.org/2001/XMLSchema#int> | <http://www.w3.org/1999/02/22-rdf-syntax-ns#_3> | <http://www.w3.org/1999/02/22-rdf-syntax-ns#_4> |
---------------------------------------------------------------------------------------------------------------------------------------------------

fx:forward

fx:forward(?a, ?b) returns the container membership property that follows ?a of ?b steps (rdf:_2, 5 -> rdf:_7)

Input

A container membership property and an integer

Output

Container membership property

Example

PREFIX  xsd:  <http://www.w3.org/2001/XMLSchema#>
PREFIX  xyz:  <http://sparql.xyz/facade-x/data/>
PREFIX  fx:   <http://sparql.xyz/facade-x/ns/>
PREFIX  rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#>

SELECT  ?slot ?p (fx:forward(?p, 3) AS ?forward)
WHERE
  { SERVICE <x-sparql-anything:>
      { fx:properties
                  fx:content     "[1,2,3]" ;
                  fx:media-type  "application/json" .
        ?s        ?p             ?slot
        FILTER ( ?p != rdf:type )
      }
  }

Result

---------------------------------------------------------------------------------------------------------------------------------------------------
| slot                                        | p                                               | forward                                         |
===================================================================================================================================================
| "1"^^<http://www.w3.org/2001/XMLSchema#int> | <http://www.w3.org/1999/02/22-rdf-syntax-ns#_1> | <http://www.w3.org/1999/02/22-rdf-syntax-ns#_4> |
| "2"^^<http://www.w3.org/2001/XMLSchema#int> | <http://www.w3.org/1999/02/22-rdf-syntax-ns#_2> | <http://www.w3.org/1999/02/22-rdf-syntax-ns#_5> |
| "3"^^<http://www.w3.org/2001/XMLSchema#int> | <http://www.w3.org/1999/02/22-rdf-syntax-ns#_3> | <http://www.w3.org/1999/02/22-rdf-syntax-ns#_6> |
---------------------------------------------------------------------------------------------------------------------------------------------------

fx:backward

fx:backward(?a, ?b) returns the container membership property that preceeds ?a of ?b steps (rdf:_24, 4 -> rdf:_20)

Input

A container membership property and an integer

Output

Container membership property

Example

PREFIX  xsd:  <http://www.w3.org/2001/XMLSchema#>
PREFIX  xyz:  <http://sparql.xyz/facade-x/data/>
PREFIX  fx:   <http://sparql.xyz/facade-x/ns/>
PREFIX  rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#>

SELECT  ?slot ?p (fx:backward(?p, 2) AS ?backward)
WHERE
  { SERVICE <x-sparql-anything:>
      { fx:properties
                  fx:content     "[1,2,3]" ;
                  fx:media-type  "application/json" .
        ?s        ?p             ?slot
        FILTER ( ?p != rdf:type )
      }
  }

Result

---------------------------------------------------------------------------------------------------------------------------------------------------
| slot                                        | p                                               | backward                                        |
===================================================================================================================================================
| "1"^^<http://www.w3.org/2001/XMLSchema#int> | <http://www.w3.org/1999/02/22-rdf-syntax-ns#_1> |                                                 |
| "2"^^<http://www.w3.org/2001/XMLSchema#int> | <http://www.w3.org/1999/02/22-rdf-syntax-ns#_2> |                                                 |
| "3"^^<http://www.w3.org/2001/XMLSchema#int> | <http://www.w3.org/1999/02/22-rdf-syntax-ns#_3> | <http://www.w3.org/1999/02/22-rdf-syntax-ns#_1> |
---------------------------------------------------------------------------------------------------------------------------------------------------

Working with strings

The system supports the following functions for string manipulation (See issue 104 and issue 121):

fx:String.startsWith

fx:String.startsWith wraps java.lang.String.startsWith

Input

String

Output

Boolean

Example

PREFIX  xsd:  <http://www.w3.org/2001/XMLSchema#>
PREFIX  xyz:  <http://sparql.xyz/facade-x/data/>
PREFIX  fx:   <http://sparql.xyz/facade-x/ns/>
PREFIX  rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#>

SELECT  (fx:String.startsWith(?string, "this") AS ?result1) (fx:String.startsWith(?string, "This") AS ?result2)
WHERE
  { SERVICE <x-sparql-anything:>
      { fx:properties
                  fx:content  "this is a test" .
        ?s        rdf:_1      ?string
      }
  }

Result

---------------------
| result1 | result2 |
=====================
| true    | false   |
---------------------

fx:String.endsWith

fx:String.endsWith wraps java.lang.String.endsWith

Input

String, String

Output

Boolean

Example

PREFIX  xsd:  <http://www.w3.org/2001/XMLSchema#>
PREFIX  xyz:  <http://sparql.xyz/facade-x/data/>
PREFIX  fx:   <http://sparql.xyz/facade-x/ns/>
PREFIX  rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#>

SELECT  (fx:String.endsWith(?string, "test") AS ?result1)
WHERE
  { SERVICE <x-sparql-anything:>
      { fx:properties
                  fx:content  "this is a test" .
        ?s        rdf:_1      ?string
      }
  }

Result

-----------
| result1 |
===========
| true    |
-----------

fx:String.indexOf

fx:String.indexOf wraps java.lang.String.indexOf

Input

String, String

Output

Integer

Example

PREFIX  xsd:  <http://www.w3.org/2001/XMLSchema#>
PREFIX  xyz:  <http://sparql.xyz/facade-x/data/>
PREFIX  fx:   <http://sparql.xyz/facade-x/ns/>
PREFIX  rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#>

SELECT  (fx:String.indexOf(?string, "i") AS ?result1) (fx:String.indexOf(?string, "test") AS ?result2)
WHERE
  { SERVICE <x-sparql-anything:>
      { fx:properties
                  fx:content  "this is a test" .
        ?s        rdf:_1      ?string
      }
  }

Result

---------------------
| result1 | result2 |
=====================
| 2       | 10      |
---------------------

fx:String.lastIndexOf

fx:String.lastIndexOf wraps java.lang.String.lastIndexOf

Input

String, String

Output

Integer

Example

PREFIX  xsd:  <http://www.w3.org/2001/XMLSchema#>
PREFIX  xyz:  <http://sparql.xyz/facade-x/data/>
PREFIX  fx:   <http://sparql.xyz/facade-x/ns/>
PREFIX  rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#>

SELECT  (fx:String.lastIndexOf(?string, "b") AS ?result1)
WHERE
  { SERVICE <x-sparql-anything:>
      { fx:properties
                  fx:content  "bob" .
        ?s        rdf:_1      ?string
      }
  }

Result

-----------
| result1 |
===========
| 2       |
-----------

fx:String.substring

fx:String.substring wraps java.lang.String.substring

Input

String, Integer, (Integer?)

Output

String

Example

PREFIX  xsd:  <http://www.w3.org/2001/XMLSchema#>
PREFIX  xyz:  <http://sparql.xyz/facade-x/data/>
PREFIX  fx:   <http://sparql.xyz/facade-x/ns/>
PREFIX  rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#>

SELECT  (fx:String.substring(?string, 10) AS ?result1) (fx:String.substring(?string, 5, 7) AS ?result2)
WHERE
  { SERVICE <x-sparql-anything:>
      { fx:properties
                  fx:content  "this is a test" .
        ?s        rdf:_1      ?string
      }
  }

Result

---------------------
| result1 | result2 |
=====================
| "test"  | "is"    |
---------------------

fx:String.toLowerCase

fx:String.toLowerCase wraps java.lang.String.toLowerCase

Input

String

Output

String

Example

PREFIX  xsd:  <http://www.w3.org/2001/XMLSchema#>
PREFIX  xyz:  <http://sparql.xyz/facade-x/data/>
PREFIX  fx:   <http://sparql.xyz/facade-x/ns/>
PREFIX  rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#>

SELECT  (fx:String.toLowerCase(?string) AS ?result1)
WHERE
  { SERVICE <x-sparql-anything:>
      { fx:properties
                  fx:content  "THIS IS A TEST" .
        ?s        rdf:_1      ?string
      }
  }

Result

--------------------
| result1          |
====================
| "this is a test" |
--------------------

fx:String.toUpperCase

fx:String.toUpperCase wraps java.lang.String.toUpperCase

Input

String

Output

String

Example

PREFIX  xsd:  <http://www.w3.org/2001/XMLSchema#>
PREFIX  xyz:  <http://sparql.xyz/facade-x/data/>
PREFIX  fx:   <http://sparql.xyz/facade-x/ns/>
PREFIX  rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#>

SELECT  (fx:String.toUpperCase(?string) AS ?result1)
WHERE
  { SERVICE <x-sparql-anything:>
      { fx:properties
                  fx:content  "this is a test" .
        ?s        rdf:_1      ?string
      }
  }

Result

--------------------
| result1          |
====================
| "THIS IS A TEST" |
--------------------

fx:String.trim

fx:String.trim wraps java.lang.String.trim

Input

String

Output

String

Example

PREFIX  xsd:  <http://www.w3.org/2001/XMLSchema#>
PREFIX  xyz:  <http://sparql.xyz/facade-x/data/>
PREFIX  fx:   <http://sparql.xyz/facade-x/ns/>
PREFIX  rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#>

SELECT  (fx:String.trim(?string) AS ?result1)
WHERE
  { SERVICE <x-sparql-anything:>
      { fx:properties
                  fx:content  "  this is a test  " .
        ?s        rdf:_1      ?string
      }
  }

Result

--------------------
| result1          |
====================
| "this is a test" |
--------------------

fx:String.replace

fx:String.replace wraps java.lang.String.replace

Input

String, Character, Character

Output

String

Example

PREFIX  xsd:  <http://www.w3.org/2001/XMLSchema#>
PREFIX  xyz:  <http://sparql.xyz/facade-x/data/>
PREFIX  fx:   <http://sparql.xyz/facade-x/ns/>
PREFIX  rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#>

SELECT  (fx:String.replace(?string, "f", "d") AS ?result1)
WHERE
  { SERVICE <x-sparql-anything:>
      { fx:properties
                  fx:content  "fog" .
        ?s        rdf:_1      ?string
      }
  }

Result

PREFIX  xsd:  <http://www.w3.org/2001/XMLSchema#>
PREFIX  xyz:  <http://sparql.xyz/facade-x/data/>
PREFIX  fx:   <http://sparql.xyz/facade-x/ns/>
PREFIX  rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#>

SELECT  (fx:String.replace(?string, "f", "d") AS ?result1)
WHERE
  { SERVICE <x-sparql-anything:>
      { fx:properties
                  fx:content  "fog" .
        ?s        rdf:_1      ?string
      }
  }

fx:String.stripLeading

fx:String.stripLeading wraps java.lang.String.stripLeading

Input

String

Output

String

Example

PREFIX  xsd:  <http://www.w3.org/2001/XMLSchema#>
PREFIX  xyz:  <http://sparql.xyz/facade-x/data/>
PREFIX  fx:   <http://sparql.xyz/facade-x/ns/>
PREFIX  rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#>

SELECT  (fx:String.stripLeading(?string) AS ?result1)
WHERE
  { SERVICE <x-sparql-anything:>
      { fx:properties
                  fx:content  "  this is a test  " .
        ?s        rdf:_1      ?string
      }
  }

Result

----------------------
| result1            |
======================
| "this is a test  " |
----------------------

fx:String.stripTrailing

fx:String.stripTrailing wraps java.lang.String.stripTrailing

Input

String

Output

String

Example

PREFIX  xsd:  <http://www.w3.org/2001/XMLSchema#>
PREFIX  xyz:  <http://sparql.xyz/facade-x/data/>
PREFIX  fx:   <http://sparql.xyz/facade-x/ns/>
PREFIX  rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#>

SELECT  (fx:String.stripTrailing(?string) AS ?result1)
WHERE
  { SERVICE <x-sparql-anything:>
      { fx:properties
                  fx:content  "  this is a test  " .
        ?s        rdf:_1      ?string
      }
  }

Result

----------------------
| result1            |
======================
| "  this is a test" |
----------------------

fx:String.removeTags

fx:String.removeTags removes the XML tags from the input string

Input

String

Output

String

Example

PREFIX  xsd:  <http://www.w3.org/2001/XMLSchema#>
PREFIX  xyz:  <http://sparql.xyz/facade-x/data/>
PREFIX  fx:   <http://sparql.xyz/facade-x/ns/>
PREFIX  rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#>

SELECT  (fx:String.removeTags(?string) AS ?result1)
WHERE
  { SERVICE <x-sparql-anything:>
      { fx:properties
                  fx:content  "<p>This is a test</p>" .
        ?s        rdf:_1      ?string
      }
  }

Result

--------------------
| result1          |
====================
| "This is a test" |
--------------------

Functions for manipulating words

The system supports the following functions to manipulate words (See issue 121).

fx:WordUtils.capitalize

fx:WordUtils.capitalize wraps org.apache.commons.text.WordUtils.capitalize

Input

String

Output

String

Example

PREFIX  xsd:  <http://www.w3.org/2001/XMLSchema#>
PREFIX  xyz:  <http://sparql.xyz/facade-x/data/>
PREFIX  fx:   <http://sparql.xyz/facade-x/ns/>
PREFIX  rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#>

SELECT  (fx:WordUtils.capitalize(?string) AS ?result1)
WHERE
  { SERVICE <x-sparql-anything:>
      { fx:properties
                  fx:content  "This is a TEST" .
        ?s        rdf:_1      ?string
      }
  }

Result

--------------------
| result1          |
====================
| "This Is A TEST" |
--------------------

fx:WordUtils.capitalizeFully

fx:WordUtils.capitalizeFully wraps org.apache.commons.text.WordUtils.capitalizeFully

Input

String

Output

String

Example

PREFIX  xsd:  <http://www.w3.org/2001/XMLSchema#>
PREFIX  xyz:  <http://sparql.xyz/facade-x/data/>
PREFIX  fx:   <http://sparql.xyz/facade-x/ns/>
PREFIX  rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#>

SELECT  (fx:WordUtils.capitalizeFully(?string) AS ?result1)
WHERE
  { SERVICE <x-sparql-anything:>
      { fx:properties
                  fx:content  "This is a TEST" .
        ?s        rdf:_1      ?string
      }
  }

Result

--------------------
| result1          |
====================
| "This Is A Test" |
--------------------

fx:WordUtils.initials

fx:WordUtils.initials wraps org.apache.commons.text.WordUtils.initials

Input

String

Output

String

Example

PREFIX  xsd:  <http://www.w3.org/2001/XMLSchema#>
PREFIX  xyz:  <http://sparql.xyz/facade-x/data/>
PREFIX  fx:   <http://sparql.xyz/facade-x/ns/>
PREFIX  rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#>

SELECT  (fx:WordUtils.initials(?string) AS ?result1)
WHERE
  { SERVICE <x-sparql-anything:>
      { fx:properties
                  fx:content  "This is a TEST" .
        ?s        rdf:_1      ?string
      }
  }

Result

-----------
| result1 |
===========
| "TiaT"  |
-----------

fx:WordUtils.swapCase

Input

String

Output

String

Example

PREFIX  xsd:  <http://www.w3.org/2001/XMLSchema#>
PREFIX  xyz:  <http://sparql.xyz/facade-x/data/>
PREFIX  fx:   <http://sparql.xyz/facade-x/ns/>
PREFIX  rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#>

SELECT  (fx:WordUtils.swapCase(?string) AS ?result1)
WHERE
  { SERVICE <x-sparql-anything:>
      { fx:properties
                  fx:content  "This is a TEST" .
        ?s        rdf:_1      ?string
      }
  }

Result

--------------------
| result1          |
====================
| "tHIS IS A test" |
--------------------

fx:WordUtils.uncapitalize

fx:WordUtils.uncapitalize wraps org.apache.commons.text.WordUtils.uncapitalize

Input

String

Output

String

Example

PREFIX  xsd:  <http://www.w3.org/2001/XMLSchema#>
PREFIX  xyz:  <http://sparql.xyz/facade-x/data/>
PREFIX  fx:   <http://sparql.xyz/facade-x/ns/>
PREFIX  rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#>

SELECT  (fx:WordUtils.uncapitalize(?string) AS ?result1)
WHERE
  { SERVICE <x-sparql-anything:>
      { fx:properties
                  fx:content  "This is a TEST" .
        ?s        rdf:_1      ?string
      }
  }

Result

--------------------
| result1          |
====================
| "this is a tEST" |
--------------------

Hash functions

The system supports the following functions for computing hash digest from strings (See issues 104 and 121):

fx:DigestUtils.md2Hex

fx:DigestUtils.md2Hex wraps org.apache.commons.codec.digest.DigestUtils.md2Hex

Input

String

Output

String

Example

PREFIX  xsd:  <http://www.w3.org/2001/XMLSchema#>
PREFIX  xyz:  <http://sparql.xyz/facade-x/data/>
PREFIX  fx:   <http://sparql.xyz/facade-x/ns/>
PREFIX  rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#>

SELECT  (fx:DigestUtils.md2Hex(?string) AS ?result1)
WHERE
  { SERVICE <x-sparql-anything:>
      { fx:properties
                  fx:content  "This is a test" .
        ?s        rdf:_1      ?string
      }
  }

Result

--------------------------------------
| result1                            |
======================================
| "dc378580fd0722e56b82666a6994c718" |
--------------------------------------

fx:DigestUtils.md5Hex

fx:DigestUtils.md5Hex wraps org.apache.commons.codec.digest.DigestUtils.md5Hex

Input

String

Output

String

Example

PREFIX  xsd:  <http://www.w3.org/2001/XMLSchema#>
PREFIX  xyz:  <http://sparql.xyz/facade-x/data/>
PREFIX  fx:   <http://sparql.xyz/facade-x/ns/>
PREFIX  rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#>

SELECT  (fx:DigestUtils.md5Hex(?string) AS ?result1)
WHERE
  { SERVICE <x-sparql-anything:>
      { fx:properties
                  fx:content  "This is a test" .
        ?s        rdf:_1      ?string
      }
  }

Result

--------------------------------------
| result1                            |
======================================
| "ce114e4501d2f4e2dcea3e17b546f339" |
--------------------------------------

fx:DigestUtils.sha1Hex

fx:DigestUtils.sha1Hex wraps org.apache.commons.codec.digest.DigestUtils.sha1Hex

Input

String

Output

String

Example

PREFIX  xsd:  <http://www.w3.org/2001/XMLSchema#>
PREFIX  xyz:  <http://sparql.xyz/facade-x/data/>
PREFIX  fx:   <http://sparql.xyz/facade-x/ns/>
PREFIX  rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#>

SELECT  (fx:DigestUtils.sha1Hex(?string) AS ?result1)
WHERE
  { SERVICE <x-sparql-anything:>
      { fx:properties
                  fx:content  "This is a test" .
        ?s        rdf:_1      ?string
      }
  }

Result

----------------------------------------------
| result1                                    |
==============================================
| "a54d88e06612d820bc3be72877c74f257b561b19" |
----------------------------------------------

fx:DigestUtils.sha256Hex

fx:DigestUtils.sha256Hex wraps org.apache.commons.codec.digest.DigestUtils.sha256Hex

Input

String

Output

String

Example

PREFIX  xsd:  <http://www.w3.org/2001/XMLSchema#>
PREFIX  xyz:  <http://sparql.xyz/facade-x/data/>
PREFIX  fx:   <http://sparql.xyz/facade-x/ns/>
PREFIX  rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#>

SELECT  (fx:DigestUtils.sha256Hex(?string) AS ?result1)
WHERE
  { SERVICE <x-sparql-anything:>
      { fx:properties
                  fx:content  "This is a test" .
        ?s        rdf:_1      ?string
      }
  }

Result

----------------------------------------------------------------------
| result1                                                            |
======================================================================
| "c7be1ed902fb8dd4d48997c6452f5d7e509fbcdbe2808b16bcf4edce4c07d14e" |
----------------------------------------------------------------------

fx:DigestUtils.sha384Hex

fx:DigestUtils.sha384Hex wraps org.apache.commons.codec.digest.DigestUtils.sha384Hex

Input

String

Output

String

Example

PREFIX  xsd:  <http://www.w3.org/2001/XMLSchema#>
PREFIX  xyz:  <http://sparql.xyz/facade-x/data/>
PREFIX  fx:   <http://sparql.xyz/facade-x/ns/>
PREFIX  rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#>

SELECT  (fx:DigestUtils.sha384Hex(?string) AS ?result1)
WHERE
  { SERVICE <x-sparql-anything:>
      { fx:properties
                  fx:content  "This is a test" .
        ?s        rdf:_1      ?string
      }
  }

Result

------------------------------------------------------------------------------------------------------
| result1                                                                                            |
======================================================================================================
| "a27c7667e58200d4c0688ea136968404a0da366b1a9fc19bb38a0c7a609a1eef2bcc82837f4f4d92031a66051494b38c" |
------------------------------------------------------------------------------------------------------

fx:DigestUtils.sha512Hex

fx:DigestUtils.sha512Hex wraps org.apache.commons.codec.digest.DigestUtils.sha512Hex

Input

String

Output

String

Example

PREFIX  xsd:  <http://www.w3.org/2001/XMLSchema#>
PREFIX  xyz:  <http://sparql.xyz/facade-x/data/>
PREFIX  fx:   <http://sparql.xyz/facade-x/ns/>
PREFIX  rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#>

SELECT  (fx:DigestUtils.sha512Hex(?string) AS ?result1)
WHERE
  { SERVICE <x-sparql-anything:>
      { fx:properties
                  fx:content  "This is a test" .
        ?s        rdf:_1      ?string
      }
  }

Result

--------------------------------------------------------------------------------------------------------------------------------------
| result1                                                                                                                            |
======================================================================================================================================
| "a028d4f74b602ba45eb0a93c9a4677240dcf281a1a9322f183bd32f0bed82ec72de9c3957b2f4c9a1ccf7ed14f85d73498df38017e703d47ebb9f0b3bf116f69" |
--------------------------------------------------------------------------------------------------------------------------------------

Functions on URLs

The system supports the following functions operating on strings that are URLs (See issue 176):

fx:URLEncoder.encode

fx:URLEncoder.encode wraps java.net.URLEncoder.encode

Input

  • String to be translated.
  • String - The name of a supported character encoding.

Output

String

Example

PREFIX  xsd:  <http://www.w3.org/2001/XMLSchema#>
PREFIX  xyz:  <http://sparql.xyz/facade-x/data/>
PREFIX  fx:   <http://sparql.xyz/facade-x/ns/>
PREFIX  rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#>

SELECT  (fx:URLEncoder.encode(?string, "UTF-8") AS ?result1)
WHERE
  { SERVICE <x-sparql-anything:>
      { fx:properties
                  fx:content  "/This is a test/" .
        ?s        rdf:_1      ?string
      }
  }

Result

--------------------------
| result1                |
==========================
| "%2FThis+is+a+test%2F" |
--------------------------

fx:URLDecoder.decode

fx:URLEncoder.decode wraps java.net.URLEncoder.decode

Input

String, The string to decode String, The name of a supported character encoding.

Output

Example

PREFIX  xsd:  <http://www.w3.org/2001/XMLSchema#>
PREFIX  xyz:  <http://sparql.xyz/facade-x/data/>
PREFIX  fx:   <http://sparql.xyz/facade-x/ns/>
PREFIX  rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#>

SELECT  (fx:URLDecoder.decode(?string, "UTF-8") AS ?result1)
WHERE
  { SERVICE <x-sparql-anything:>
      { fx:properties
                  fx:content  "This+is+a+test" .
        ?s        rdf:_1      ?string
      }
  }

Result

--------------------
| result1          |
====================
| "This is a test" |
--------------------

Working with graph nodes

The system supports the following functions for working on the graph nodes.

fx:serial

The function fx:serial (?a ... ?n) generates an incremental number using the arguments as reference counters. For example, calling fx:serial("x") two times will generate 1 and then 2. Instead, calling fx:serial(?x) multiple times will generate sequential numbers for each value of ?x.

Input

Any sequence of nodes

Output

Integer

Example

PREFIX  xsd:  <http://www.w3.org/2001/XMLSchema#>
PREFIX  xyz:  <http://sparql.xyz/facade-x/data/>
PREFIX  fx:   <http://sparql.xyz/facade-x/ns/>
PREFIX  rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#>

SELECT  ?s (fx:serial(?s) AS ?serial)
WHERE
  { SERVICE <x-sparql-anything:>
      { fx:properties
                  fx:content     "[1,2,1,2,4]" ;
                  fx:media-type  "application/json" .
        ?c        fx:anySlot     ?s
      }
  }

Result

--------------------------------------------------------
| s                                           | serial |
========================================================
| "1"^^<http://www.w3.org/2001/XMLSchema#int> | 1      |
| "2"^^<http://www.w3.org/2001/XMLSchema#int> | 1      |
| "1"^^<http://www.w3.org/2001/XMLSchema#int> | 2      |
| "2"^^<http://www.w3.org/2001/XMLSchema#int> | 2      |
| "4"^^<http://www.w3.org/2001/XMLSchema#int> | 1      |
--------------------------------------------------------

Example

PREFIX  xsd:  <http://www.w3.org/2001/XMLSchema#>
PREFIX  xyz:  <http://sparql.xyz/facade-x/data/>
PREFIX  fx:   <http://sparql.xyz/facade-x/ns/>
PREFIX  rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#>

SELECT  ?wins ?team (fx:serial(?wins, ?team) AS ?serial)
WHERE
  { SERVICE <x-sparql-anything:>
      { fx:properties
                  fx:content     "[{\"team\":\"Golden State Warriors\", \"year\":2015, \"wins\": 67}, {\"team\":\"Golden State Warriors\", \"year\":2016, \"wins\": 73}, {\"team\":\"Golden State Warriors\", \"year\":2017, \"wins\": 67}]" ;
                  fx:media-type  "application/json" .
        ?c        xyz:wins       ?wins ;
                  xyz:team       ?team
      }
  }

Result

Note: ?serial increments when a certain team concludes the season with a certain number of score.

-----------------------------------------------------------------------------------
| wins                                         | team                    | serial |
===================================================================================
| "67"^^<http://www.w3.org/2001/XMLSchema#int> | "Golden State Warriors" | 1      |
| "73"^^<http://www.w3.org/2001/XMLSchema#int> | "Golden State Warriors" | 1      |
| "67"^^<http://www.w3.org/2001/XMLSchema#int> | "Golden State Warriors" | 2      |
-----------------------------------------------------------------------------------

fx:entity

The function fx:entity (?a ... ?n) accepts a list of arguments and performs concatenation and automatic casting to string. Container membership properties (rdf:_1,rdf:_2,...) are cast to numbers and then to strings ("1","2").

BIND ( fx:entity ( myns:, "dummy-entity", 1) AS ?myentity)
# is equivalent to
BIND ( IRI( CONCAT ( STR (myns:), "dummy-entity", STR(1) ) AS ?myentity )

See also issue 106

Input

Any sequence of nodes

Output

URI Node

Example

PREFIX  xsd:  <http://www.w3.org/2001/XMLSchema#>
PREFIX  xyz:  <http://sparql.xyz/facade-x/data/>
PREFIX  fx:   <http://sparql.xyz/facade-x/ns/>
PREFIX  rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#>

SELECT  ?team ?year (fx:entity("http://example.org/", fx:URLEncoder.encode(?team, "UTF-8"), ?year) AS ?entity)
WHERE
  { SERVICE <x-sparql-anything:>
      { fx:properties
                  fx:content     "[{\"team\":\"Golden State Warriors\", \"year\":2015, \"wins\": 67}, {\"team\":\"Golden State Warriors\", \"year\":2016, \"wins\": 73}, {\"team\":\"Golden State Warriors\", \"year\":2017, \"wins\": 67}]" ;
                  fx:media-type  "application/json" .
        ?c        xyz:year       ?year ;
                  xyz:team       ?team
      }
  }

Result

-----------------------------------------------------------------------------------------------------------------------------
| team                    | year                                           | entity                                         |
=============================================================================================================================
| "Golden State Warriors" | "2015"^^<http://www.w3.org/2001/XMLSchema#int> | <http://example.org/Golden+State+Warriors2015> |
| "Golden State Warriors" | "2016"^^<http://www.w3.org/2001/XMLSchema#int> | <http://example.org/Golden+State+Warriors2016> |
| "Golden State Warriors" | "2017"^^<http://www.w3.org/2001/XMLSchema#int> | <http://example.org/Golden+State+Warriors2017> |
-----------------------------------------------------------------------------------------------------------------------------

fx:literal

The function fx:literal( ?a , ?b ) builds a literal from the string representation of ?a, using ?b either as a typed literal (if a IRI is given) or a lang code (if a string of length of two is given).

Input

String, (URI or language code)

Output

Literal node

Example

PREFIX  xsd:  <http://www.w3.org/2001/XMLSchema#>
PREFIX  xyz:  <http://sparql.xyz/facade-x/data/>
PREFIX  fx:   <http://sparql.xyz/facade-x/ns/>
PREFIX  rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#>

SELECT  (fx:literal(?string, xsd:int) AS ?result)
WHERE
  { SERVICE <x-sparql-anything:>
      { fx:properties
                  fx:content  "1" .
        ?s        rdf:_1      ?string
      }
  }

Result

-----------------------------------------------
| result                                      |
===============================================
| "1"^^<http://www.w3.org/2001/XMLSchema#int> |
-----------------------------------------------

Example

PREFIX  xsd:  <http://www.w3.org/2001/XMLSchema#>
PREFIX  xyz:  <http://sparql.xyz/facade-x/data/>
PREFIX  fx:   <http://sparql.xyz/facade-x/ns/>
PREFIX  rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#>

SELECT  (fx:literal(?string, "it") AS ?result)
WHERE
  { SERVICE <x-sparql-anything:>
      { fx:properties
                  fx:content  "uno" .
        ?s        rdf:_1      ?string
      }
  }

Result

------------
| result   |
============
| "uno"@it |
------------

fx:bnode

The function fx:bnode(?a) builds a blank node enforcing the node value as local identifier. This is useful when multiple construct templates are populated with bnode generated on different query solutions but we want them to be joined in the output RDF graph. Apparently, the standard function BNODE does generate a new node for each query solution (see issue #273 for an explanatory case).

Input

Any node

Output

Blank node

Example

PREFIX  xyz:  <http://sparql.xyz/facade-x/data/>
PREFIX  fx:   <http://sparql.xyz/facade-x/ns/>
PREFIX  ex:   <http://example/>

CONSTRUCT 
  { 
    ?bnode ex:p ?A .
  }
WHERE
  { SERVICE <x-sparql-anything:>
      { fx:properties
                  fx:content      "c1,c2\nb0,A\nb0,B\nb0,C\nb0,D\nb0,E\nb1,A\nb2,B\nb3,C\nb4,D\nb5,E" ;
                  fx:media-type   "text/csv" ;
                  fx:csv.headers  true .
        _:b0      xyz:c1          ?b0 ;
                  xyz:c2          ?A
      }
    BIND(fx:bnode(?b0) AS ?bnode)
  }

Note: the CSV passed as content string is the following

c1,c2
b0,A
b0,B
b0,C
b0,D
b0,E
b1,A
b2,B
b3,C
b4,D
b5,E

Result

@prefix ex:   <http://example/> .
@prefix fx:   <http://sparql.xyz/facade-x/ns/> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix xsd:  <http://www.w3.org/2001/XMLSchema#> .
@prefix xyz:  <http://sparql.xyz/facade-x/data/> .

[ ex:p    "D" ] .

[ ex:p    "A" ] .

[ ex:p    "C" ] .

[ ex:p    "E" ] .

[ ex:p    "C" , "E" , "D" , "A" , "B" ] .

[ ex:p    "B" ] .

fx:LevenshteinDistance

The function fx:LevenshteinDistance(?n1, ?n2) computes the Levenshtein Distance between ?n1 and ?n2 (see #182).

Input

String, String

Output

Integer

Example

PREFIX fx:  <http://sparql.xyz/facade-x/ns/> 

SELECT ?result WHERE { 
    BIND (fx:LevenshteinDistance("abc", "cbe") AS ?result) 
}

Result

result
2

fx:CosineDistance

The function fx:CosineDistance(?n1, ?n2) computes the Cosine Distance between ?n1 and ?n2 (see #182).

Input

String, String

Output

Double

Example

PREFIX fx:  <http://sparql.xyz/facade-x/ns/> 

SELECT ?result WHERE { 
    BIND (fx:CosineDistance("abc", "cbe") AS ?result) 
}

Result

result
1.0

fx:JaccardDistance

The function fx:JaccardDistance(?n1, ?n2) computes the Jaccard Distance between ?n1 and ?n2 (see #182).

Input

String, String

Output

Double

Example

PREFIX fx:  <http://sparql.xyz/facade-x/ns/> 

SELECT ?result WHERE { 
    BIND (fx:JaccardDistance("abc", "cbe") AS ?result) 
}

Result

result
0.5

fx:JaroWinklerDistance

The function fx:JaroWinklerDistance(?n1, ?n2) computes the Jaro-Winkler Distance between ?n1 and ?n2 (see #182).

Input

String, String

Output

Double

Example

PREFIX fx:  <http://sparql.xyz/facade-x/ns/> 

SELECT ?result WHERE { 
    BIND (fx:JaroWinklerDistance("abc", "cbe") AS ?result) 
}

Result

result
0.44444444444444453

fx:LongestCommonSubsequenceDistance

The function fx:LongestCommonSubsequenceDistance(?n1, ?n2) computes the Longest Common Subsequence Distance between ?n1 and ?n2 (see #182).

Input

String, String

Output

Integer

Example

PREFIX fx:  <http://sparql.xyz/facade-x/ns/> 

SELECT ?result WHERE { 
    BIND (fx:HammingDistance("abc", "abe") AS ?result) 
}

Result

result
2

fx:HammingDistance

The function fx:HammingDistance(?n1, ?n2) computes the Hamming Distance between ?n1 and ?n2 (see #182).

Input

String, String

Output

Integer

Example

PREFIX fx:  <http://sparql.xyz/facade-x/ns/> 

SELECT ?result WHERE { 
    BIND (fx:HammingDistance("abc", "abe") AS ?result) 
}

Result

result
1

fx:QGramDistance

The function fx:QGramDistance(?n1, ?n2) computes the QGram Distance between ?n1 and ?n2 (see #394).

Input

String, String

Output

Double

Example

PREFIX fx:  <http://sparql.xyz/facade-x/ns/> 

SELECT ?result WHERE { 
    BIND (fx:QGramDistance("abcd", "abce") AS ?result) 
}

Result

result
2.0