> For the complete documentation index, see [llms.txt](https://emeditweb.gitbook.io/pulsar-stellar-sdk/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://emeditweb.gitbook.io/pulsar-stellar-sdk/concepts.md).

# Concepts

The SDK is small, but a few ideas run through all of it. Read these once and the reference pages will make sense at a glance.

* [Wire-faithful vs call-oriented](/pulsar-stellar-sdk/concepts/wire-faithful-vs-call-oriented.md). What a `DecodedEvent` reports, how it differs from a generated binding, and how to bridge the two on purpose.
* [Two paths, one type](/pulsar-stellar-sdk/concepts/two-paths.md). The indexer path and the RPC path, what each guarantees, and why one ends and the other does not.
* [Decoded values](/pulsar-stellar-sdk/concepts/decoded-values.md). The `DecodedValue` taxonomy, why wide integers are strings, and why an unknown value degrades instead of throwing.
* [Successful vs reverted calls](/pulsar-stellar-sdk/concepts/successful-contract-call.md). Why every event carries `inSuccessfulContractCall`, and why the SDK does not filter for you.
* [Error handling](/pulsar-stellar-sdk/concepts/error-handling.md). When the SDK returns null, when it throws, and the error hierarchy you branch on.


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