What I meant was: How do we know what requests a particular URI of the container accepts and what parameters we can use?
For example: the container URI: http://example.com/containers/container1
-> Now I want to know a way to access the metadata of the container. How do I do it?
The main reason I am trying to ask this question is I am working on migration of Fedora Commons from 3 to 4. And I am confused by many different schemas and notations. In some places, they use http://something.com/smthng/fcr:metadata.
At some places, they use http://something.com/smthng/metadata. Sometimes, fedora namespace will work in the URI and in some places it won't work. I am confused.
I want to know a way to know to all the accepted conventions on a URI.
I really don't think you have to go beyond Wikipedia's Uniform Resource Identifier definition to understand the standards for URIs, URLs and URNs.
However, the question is more likely about the Linked Data Platform. If you go to Concept Mapping - Fedora 3 to 4 , the links for Fedora 4 go to the W3C Linked Data Platform (LDP) recommendation. That basically states how the REST API works to query RDF data.
LDP containers are a way to partition RDF data so you can query the container and get a list of RDF resources. I don't think there is a way to query their metadata. The set of available containers defined in the data itself, and are not required. I.e. the data may be entirely defined with resources and containers are just a way to partition RDF data. If you have SPARQL access to the data, one idea is to query the data looking for LDP containers. Then you can sent REST requests to get that data.
(BTW, A RDF text serialization is a text-based representation of RDF graphs. Using a text serialization allows users to exchange data in a standard format. RDF standards include RDF/XML, Turtle, N-Triples, and JSON-LD.)