Advanced Graph Querying - Revision history

Wikiservice: Refresh MemCP documentation: accuracy, operational guidance, performance profile and maintained API reference

2026-08-28T10:13:54Z

Refresh MemCP documentation: accuracy, operational guidance, performance profile and maintained API reference

← Older revision		Revision as of 12:13, 28 August 2026
Line 5:		Line 5:
	MemCP exposes its tested SPARQL subset at <code>/rdf/<database></code>. Queries can combine triple patterns, FILTER expressions, OPTIONAL blocks, bindings, and supported update forms. Turtle data can be loaded through <code>/rdf/<database>/load_ttl</code>.		MemCP exposes its tested SPARQL subset at <code>/rdf/<database></code>. Queries can combine triple patterns, FILTER expressions, OPTIONAL blocks, bindings, and supported update forms. Turtle data can be loaded through <code>/rdf/<database>/load_ttl</code>.

	<~~syntaxhighlight lang="sparql"~~>		<pre>
	SELECT ?person ?name WHERE {		SELECT ?person ?name WHERE {
	?person <http://xmlns.com/foaf/0.1/name> ?name .		?person <http://xmlns.com/foaf/0.1/name> ?name .
Line 11:		Line 11:
	FILTER(!BOUND(?active) \|\| ?active = true)		FILTER(!BOUND(?active) \|\| ?active = true)
	}		}
	</~~syntaxhighlight~~>		</pre>

	Update templates include tested DELETE/INSERT/WHERE forms. RDF literals and IRIs must use the supported escaping rules; application input must not be concatenated into query text without validation.		Update templates include tested DELETE/INSERT/WHERE forms. RDF literals and IRIs must use the supported escaping rules; application input must not be concatenated into query text without validation.

Wikiservice: Refresh MemCP documentation: accuracy, operational guidance, performance profile and maintained API reference

2026-08-28T09:59:23Z

Refresh MemCP documentation: accuracy, operational guidance, performance profile and maintained API reference

← Older revision		Revision as of 11:59, 28 August 2026
Line 1:		Line 1:
	~~== Property Paths ==~~		<!-- Copyright (C) 2026 Carl-Philip Haensch -->
	~~see also~~: ~~https://en~~.~~wikibooks.org/wiki/SPARQL/Property_paths~~		<!-- SPDX-License-Identifier: GPL-3.0-or-later -->
			= Advanced Graph Querying =

	~~TODO for~~ MemCP:		MemCP exposes its tested SPARQL subset at <code>/rdf/<database></code>. Queries can combine triple patterns, FILTER expressions, OPTIONAL blocks, bindings, and supported update forms. Turtle data can be loaded through <code>/rdf/<database>/load_ttl</code>.

	* property/~~propertypath~~		<syntaxhighlight lang="sparql">
	* propertypath*, propertypath+ (~~mark&sweep~~, ~~then iterate~~ over ~~the results)~~		SELECT ?person ?name WHERE {
	* property?		?person <http://xmlns.com/foaf/0.1/name> ?name .
	* (propertypath)		OPTIONAL { ?person <http://example.org/active> ?active . }
	* ^property ~~(inverse~~ path)		FILTER(!BOUND(?active) \|\| ?active = true)
			}
			</syntaxhighlight>

			Update templates include tested DELETE/INSERT/WHERE forms. RDF literals and IRIs must use the supported escaping rules; application input must not be concatenated into query text without validation.

			This page documents a tested subset, not complete SPARQL standard conformance or a separate general-purpose graph execution engine. Add successful and must-fail integration tests before advertising another construct. See [[Introduction to RDF]] and [[SQL over REST]].

			== Property-path roadmap ==

			SPARQL property paths remain a planned extension. The intended progression covers one-step alternatives/sequences, inverse paths, optional paths and transitive <code>*</code>/<code>+</code> traversal. Recursive traversal needs explicit visited-set semantics, cancellation, bounds and a physical representation that does not repeatedly materialize the same nodes. Until tests and documentation say otherwise, do not assume property-path syntax is accepted.

Carli: Created page with "== Property Paths == see also: https://en.wikibooks.org/wiki/SPARQL/Property_paths TODO for MemCP: * property/propertypath * propertypath, propertypath+ (mark&sweep, then iterate over the results) property? * (propertypath) * ^property (inverse path)"

2024-05-26T12:20:05Z

Created page with "== Property Paths == see also: https://en.wikibooks.org/wiki/SPARQL/Property_paths TODO for MemCP: * property/propertypath * propertypath*, propertypath+ (mark&sweep, then iterate over the results) * property? * (propertypath) * ^property (inverse path)"

New page

== Property Paths ==
see also: https://en.wikibooks.org/wiki/SPARQL/Property_paths

TODO for MemCP:

* property/propertypath
* propertypath*, propertypath+ (mark&sweep, then iterate over the results)
* property?
* (propertypath)
* ^property (inverse path)

Advanced Graph Querying - Revision history

Wikiservice: Refresh MemCP documentation: accuracy, operational guidance, performance profile and maintained API reference

Wikiservice: Refresh MemCP documentation: accuracy, operational guidance, performance profile and maintained API reference

Carli: Created page with "== Property Paths == see also: https://en.wikibooks.org/wiki/SPARQL/Property_paths TODO for MemCP: * property/propertypath * propertypath*, propertypath+ (mark&sweep, then iterate over the results) * property? * (propertypath) * ^property (inverse path)"

Carli: Created page with "== Property Paths == see also: https://en.wikibooks.org/wiki/SPARQL/Property_paths TODO for MemCP: * property/propertypath * propertypath, propertypath+ (mark&sweep, then iterate over the results) property? * (propertypath) * ^property (inverse path)"