!!! Overview
[{$pagename}] The query is an optional part, separated by a question mark ("?"), that contains additional identification information that is not hierarchical in nature. The syntax of the query string is not well defined; however by convention it is most often a sequence of <key>=<value> pairs separated by a semicolon or an ampersand.

!! [RFC 7320] [{$pagename}]
[RFC 7320] states that the presence, format and semantics of the query component of [URIs] is dependent upon many factors, and [MAY] be constrained by a [URI Scheme] definition.  

Often, they are determined by the implementation of a resource itself.

Applications [MUST NOT] directly specify the syntax of queries, as this can cause operational difficulties for deployments that do not support a particular form of a query.  

For example, a site may wish to support an application using "static" files that do not support query parameters.

Extensions [MUST NOT] constrain the format or semantics of queries.

For example, an extension that indicates that all query parameters with the name "sig" indicate a cryptographic signature would collide with potentially preexisting query parameters on sites and lead clients to assume that any matching query parameter is a signature.

HTML [W3C.REC-html401-19991224|https://www.w3.org/TR/1999/REC-html401-19991224/ |target='_blank'] constrains the syntax of query strings used in form submission.  New form languages [SHOULD NOT] emulate it, but instead allow creation of a broader variety of [URIs] (e.g., by allowing the form to create new path components, and so forth).

Note that "[well-known]" [URIs] (see [RFC 5785]) [MAY] constrain their own query syntax, since these name spaces are effectively delegated to the registering party.

!! More Information
There might be more information for this subject on one of the following:
[{ReferringPagesPlugin before='*' after='\n' }]