Help:Property chains and paths



The property chain feature allows to select pages and values with help of the dot chain syntax.

Chaining of entities is supported:
 * As part of a query condition (e.g. )
 * Using a query printoutCiteRef::gh:smw:1824(e.g. )or
 * Defining a sort parameterCiteRef::gh:smw:2073 (e.g. )

One requirement for both the condition and the print request is that chain members are to be page type entities while the last member is nonrestrictive to any type. The reason is that in order for the traversal process to be successful, chain member nodes are required to be referable which is not possible for primitive data values such as numbers, dates, or text.

It should be noted that the chain syntaxCiteRef::w3:primer:prop.chain on a query condition and its application on a result printout are technically two distinct operations that can not be compared with each other. The first relates to the filtering of results and the latter being a traversal process.

Examples

 * sandbox:Issue/2073
 * sandbox:Issue/2402

Query examples

 * Regular use cases


 * Advanced use cases