SOAP API Developer Guide

About SOAP API
Release Notes
Quick Start: SOAP API
Core Data Types Used in API Calls
Tooling API Objects in the Enterprise WSDL
API Call Basics
Field Types
Primitive Data Types
Error Handling
Security and the API
Authorization Through External Client Apps or Connected Apps and OAuth 2.0
SOAP API End-of-Life Policy
Using the Partner WSDL
Apex-Related Calls
Core Calls
Describe Calls
Utility Calls
SOAP Headers
Implementation Considerations
Objects and SOAP API Calls and Headers for Apex
Outbound Messaging
Data Loading and Integration
Data Replication
Feature-Specific Considerations
Glossary
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Field Types

SOAP API also uses field types that extend the primitive data types.

See Field Types in the Object Reference for the Salesforce Platform.