add a section explaining some general/common things about the api
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README.md
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README.md
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@ -53,6 +53,23 @@ All of the functions that wrap FHIR API calls are located in `clj-hl7-fhir.core`
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(use 'clj-hl7-fhir.core)
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(use 'clj-hl7-fhir.core)
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```
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```
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### General Concepts
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Most API functions take a `type` parameter which should be either a keyword or string
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specifying the [FHIR resource](http://hl7.org/implement/standards/fhir/resourcelist.html)
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that the operation is dealing with. The resource can be specified either in "camel case"
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(e.g. `"Patient"` or `"DiagnosticReport"`) or in "kebab case", which is what most Clojure
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code uses (e.g. `:patient` or `:diagnostic-report`). FHIR servers will typically return
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an error if you pass in a resource type that is not recognized.
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Return values will almost always (if not nil) be a FHIR resource or bundle ([as described here](http://hl7.org/implement/standards/fhir/json.html).
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The main difference is that a bundle can contain any number of resources (even zero) and
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also contains a bit of extra metadata about each resource contained inside. The functions
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which return resources as bundles will always return a bundle as long as an error did
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not occur, however the bundle may contain zero resources. The functions which return
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raw resources will either return a resource or nil on success. Exceptions to this
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will be noted in the individual function documentation (e.g. `create` and `update`).
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### base-url
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### base-url
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All core API functions take a `base-url` parameter. This is the [Service Root URL](http://hl7.org/implement/standards/fhir/http.html#root)
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All core API functions take a `base-url` parameter. This is the [Service Root URL](http://hl7.org/implement/standards/fhir/http.html#root)
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