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+# Configure resource loaders
+
+As explained on the [Request pipeline page](../explanations/request-pipeline.md), early in the request pipeline, Kopflos selects a resource loader to load the requested resource's Core Representation.
+
+Resource Loaders can be declared on instances of `kopflos:ResourceShape`, `kopflos:Api`, and `kopflos:Config` resources.
+
+## Predefined loaders
+
+Kopflos recognizes two loaders out of the box. They are identified by their shorthand identifiers.
+
+### Own graph loader
+
+The "Own Graph" loader is the default.
+It loads the requested resource from the same graph where the request was made.
+For example,
+a request to `https://example.org/person/1` will load the entire named graph `https://example.org/person/1` as Core Representation.
+
+```turtle
+PREFIX kopflos: <https://kopflos.described.at/>
+
+<>
+  # a kopflos:ResourceShape ; # or
+  # a kopflos:Api ;           # or 
+  # a kopflos:Config ;
+  kopflos:resourceLoader kopflos:OwnGraphLoader ;
+.
+```
+
+### `DESCRIBE` loader
+
+The `DESCRIBE` loader is a built-in loader
+that uses the SPARQL `DESCRIBE` query to load the requested resource.
+The loader will issue a `DESCRIBE` query to the default SPARQL endpoint.
+
+```turtle
+PREFIX kopflos: <https://kopflos.described.at/>
+
+<>
+  # a kopflos:ResourceShape ; # or
+  # a kopflos:Api ;           # or 
+  # a kopflos:Config ;
+  kopflos:resourceLoader kopflos:DescribeLoader ;
+.
+```
+
+## Loader precedence
+
+Kopflos selects a loader based on the `kopflos:resourceLoader` property,
+going bottom-up from the Resource Shape to the shared `kopflos:Config` resource.
+
+```turtle
+PREFIX sh: <http://www.w3.org/ns/shacl#>
+PREFIX kopflos: <https://kopflos.described.at/>
+PREFIX ex: <http://example.org/>
+
+ex:PersonShape
+  a kopflos:ResourceShape ;
+  kopflos:api ex:PeopleApi ;
+  sh:targetNode ex:Person ;
+  kopflos:resourceLoader ex:ResourceLoader1 ;
+.
+
+ex:AddressShape
+  a kopflos:ResourceShape ;
+  kopflos:api ex:PeopleApi ;
+  sh:targetNode ex:Person ;
+.
+
+ex:PeopleApi
+  a kopflos:Api ;
+  kopflos:config ex:Config ;
+  kopflos:resourceLoader ex:ResourceLoader2 ;
+.
+
+ex:ArticleShape
+  kopflos:api ex:PublishingApi ;
+  sh:targetNode ex:Article ;
+.
+
+ex:PublishingApi
+  a kopflos:Api ;
+  kopflos:config ex:Config ;
+.
+
+ex:Config
+  a kopflos:Config ;
+  kopflos:resourceLoader ex:ResourceLoader3 ;
+.
+```
+
+The algorithm is straightforward. For any given matched resource shape, Kopflos will:
+1. Check if the resource shape has a `kopflos:resourceLoader` property. If it does, Kopflos will use the loader specified in the property.
+2. If the resource shape does not have a `kopflos:resourceLoader` property, Kopflos will look for the `kopflos:resourceLoader` property in the resource's API resource.
+3. If the API resource does not have a `kopflos:resourceLoader` property, Kopflos will look for the `kopflos:resourceLoader` property in the linked `kopflos:Config` resource.
+
+In the example above:
+- If a requested resource matches the `ex:PersonShape`, Kopflos will use `ex:ResourceLoader1` from the resource shape itself.
+- If a requested resource matches the `ex:AddressShape`, Kopflos will use `ex:ResourceLoader2` from the API resource.
+- If a requested resource matches the `ex:ArticleShape`, Kopflos will use `ex:ResourceLoader3` from the Config resource.
+
+## Implementing and using custom Resource Loaders
+
+A loader is a function that takes the requested URI
+(in the form of a [NamedNode](https://rdf.js.org/data-model-spec/#namednode-interface))
+and returns a Core Representation as an [RDF/JS Stream](https://rdf.js.org/stream-spec/#stream-interface).
+It also takes a second argument: the instance of Kopflos that is processing the request.
+
+For example, here is a loader which sends a request query to a Stardog database,
+with a query hint to ensure that the Concise Bounded Description (CBD) is returned.
+
+```ts
+// src/resource-loaders/stardog-loaders.ts
+import type { ResourceLoader } from '@kopflos-cms/core'
+
+export const CBD: ResourceLoader = async (uri, kopflos) => {
+  const query = `
+#pragma describe.strategy cbd  
+DESCRIBE <${uri.value}>`
+  
+  return kopflos.env.sparql.default.stream.query.construct(query)
+}
+```
+
+To use it as the default in an API, declare the loader in the API's configuration:
+
+```turtle
+PREFIX code: <https://cube.link/code#>
+PREFIX kopflos: <https://kopflos.described.at/>
+PREFIX ex: <http://example.org/>
+
+ex:Config
+  a kopflos:Config ;
+  kopflos:resourceLoader
+    [
+      a code:EcmaScriptModule ;
+      code:link <file:src/resource-loaders/stardog-loaders.js#CBD> ;
+    ] ;
+.
+```