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SPARQLProject

[Experimental]

SPARQLProject["var"]

is a query operator that yields solutions containing only values for the variable "var".

SPARQLProject["newvar"expr]

yields solutions containing only the variable "newvar" whose value is computed from expr.

SPARQLProject[{vspec1,vspec2,…}]

selects and computes values for multiple variables.

Details and Options

  • A RightComposition of operators SPARQLSelect[…]/*…/*SPARQLProject[…]/*… can be used in SPARQLExecute to query a SPARQL endpoint. Composition is also supported.
  • SPARQLProject[…] can be applied to the result of a SPARQLSelect query.
  • In SPARQLProject[{…,"newvari"expri,…,"newvari+n"expri+n,…}], SPARQLVariable["newvari"] can be used in expri+n to refer to the value of expri.

Examples

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Basic Examples  (1)Summary of the most common use cases

In[1]:=1
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https://wolfram.com/xid/0d2fb8m8r9fo8302xe2f0qxfv6-5446c9

Data about books:

In[2]:=2
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https://wolfram.com/xid/0d2fb8m8r9fo8302xe2f0qxfv6-gzx3l6

Find books and compute their time since publication in years:

In[3]:=3
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https://wolfram.com/xid/0d2fb8m8r9fo8302xe2f0qxfv6-7bwuro
Out[3]=3

Properties & Relations  (1)Properties of the function, and connections to other functions

In[1]:=1
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https://wolfram.com/xid/0d2fb8m8r9fo8302xe2f0qxfv6-qfcmvn

Solutions for two variables:

In[2]:=2
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https://wolfram.com/xid/0d2fb8m8r9fo8302xe2f0qxfv6-kqoe0v

Project to variable "x":

In[3]:=3
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https://wolfram.com/xid/0d2fb8m8r9fo8302xe2f0qxfv6-ncusu3
Out[3]=3

The same using KeyTake:

In[4]:=4
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https://wolfram.com/xid/0d2fb8m8r9fo8302xe2f0qxfv6-ot8pak
Out[4]=4

Compute the square of "x":

In[5]:=5
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https://wolfram.com/xid/0d2fb8m8r9fo8302xe2f0qxfv6-p4oh3h
Out[5]=5

The same using Query:

In[6]:=6
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https://wolfram.com/xid/0d2fb8m8r9fo8302xe2f0qxfv6-rgmtfz
Out[6]=6
Wolfram Research (2020), SPARQLProject, Wolfram Language function, https://reference.wolfram.com/language/GraphStore/ref/SPARQLProject.html.
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Wolfram Research (2020), SPARQLProject, Wolfram Language function, https://reference.wolfram.com/language/GraphStore/ref/SPARQLProject.html.

Text

Wolfram Research (2020), SPARQLProject, Wolfram Language function, https://reference.wolfram.com/language/GraphStore/ref/SPARQLProject.html.

✖
Wolfram Research (2020), SPARQLProject, Wolfram Language function, https://reference.wolfram.com/language/GraphStore/ref/SPARQLProject.html.

CMS

Wolfram Language. 2020. "SPARQLProject." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/GraphStore/ref/SPARQLProject.html.

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Wolfram Language. 2020. "SPARQLProject." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/GraphStore/ref/SPARQLProject.html.

APA

Wolfram Language. (2020). SPARQLProject. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/GraphStore/ref/SPARQLProject.html

✖
Wolfram Language. (2020). SPARQLProject. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/GraphStore/ref/SPARQLProject.html

BibTeX

@misc{reference.wolfram_2025_sparqlproject, author="Wolfram Research", title="{SPARQLProject}", year="2020", howpublished="\url{https://reference.wolfram.com/language/GraphStore/ref/SPARQLProject.html}", note=[Accessed: 27-March-2025 ]}

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@misc{reference.wolfram_2025_sparqlproject, author="Wolfram Research", title="{SPARQLProject}", year="2020", howpublished="\url{https://reference.wolfram.com/language/GraphStore/ref/SPARQLProject.html}", note=[Accessed: 27-March-2025 ]}

BibLaTeX

@online{reference.wolfram_2025_sparqlproject, organization={Wolfram Research}, title={SPARQLProject}, year={2020}, url={https://reference.wolfram.com/language/GraphStore/ref/SPARQLProject.html}, note=[Accessed: 27-March-2025 ]}

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@online{reference.wolfram_2025_sparqlproject, organization={Wolfram Research}, title={SPARQLProject}, year={2020}, url={https://reference.wolfram.com/language/GraphStore/ref/SPARQLProject.html}, note=[Accessed: 27-March-2025 ]}