信息提取 Agent：结构化数据提取与整理

本教程面向信息提取场景，展示如何利用 xParse Extract API 作为数据底座，构建能够从非结构化文档中提取结构化信息（如发票、医疗票据、合同、简历、产品规格、API接口等）并自动整理的智能Agent。

场景介绍

业务痛点

在信息提取场景中，企业和开发者面临以下挑战：

文档格式多样：需要处理发票、医疗票据、合同、简历、产品文档、技术文档等多种格式
信息提取繁琐：需要从非结构化文档中提取结构化信息（发票信息、医疗费用、合同条款、个人信息、工作经历、产品参数、API接口等）
数据标准化困难：不同来源的数据格式不统一，需要标准化处理
批量处理需求：需要处理大量文档，手动提取效率低
数据验证：提取的数据需要验证和校验，确保准确性
财务合规：发票和医疗票据需要符合财务和税务要求
法律风险：合同信息提取需要准确识别关键条款和风险点

解决方案

通过构建信息提取 Agent，我们可以实现：

一步完成解析与提取：使用 xParse Extract API，文档解析与结构化抽取在一次 API 调用中完成，无需分步处理
Schema 驱动提取：通过定义 JSON Schema 精确控制提取字段和格式，确保输出一致性
数据标准化：将提取的信息转换为标准格式（JSON、CSV等）
数据验证：验证提取的数据完整性和准确性
批量处理：支持批量处理大量文档
财务自动化：自动提取发票和医疗票据信息，支持财务系统对接
合同分析：提取合同关键信息，识别重要条款和风险点

架构设计

文档（PDF/Word/Excel/图片）
    ↓
[xParse Extract API]
    └─ 解析文档 + 结构化抽取（一步完成）
    ↓
[LangChain Agent]
    ├─ Tool 1-7: 调用 Extract API（各自定义 Schema）
    ↓
结构化数据（JSON/CSV）

核心流程：

每个提取工具定义专属的 JSON Schema，描述需要提取的字段和结构
调用 xParse Extract API，传入文档文件和 Schema，一步完成解析与结构化抽取

环境准备

python -m venv .venv && source .venv/bin/activate
pip install requests langchain langchain-community langchain-core \
            python-dotenv pandas
export TEXTIN_APP_ID=your-app-id # 在 TextIn 官网注册获取
export TEXTIN_SECRET_CODE=your-secret-code # 在 TextIn 官网注册获取
export DASHSCOPE_API_KEY=your-dashscope-api-key # 本教程使用通义千问大模型，也可以替换成其他大模型

提示：TEXTIN_APP_ID 与 TEXTIN_SECRET_CODE 参考 API Key，请登录 Textin 工作台获取。示例中使用 通义千问 的大模型能力，其他模型用法类似。

Step 1：配置 Extract API

定义通用的 Extract API 调用函数和文件路径解析辅助函数：

import os
import json
import base64
import requests
from dotenv import load_dotenv

load_dotenv()

EXTRACT_API_URL = "https://api.textin.com/ai/service/v3/entity_extraction"

def extract_from_file(file_path: str, schema: dict, generate_citations: bool = False, stamp: bool = False) -> dict:
    """使用 xParse Extract API 从文档中提取结构化信息"""
    with open(file_path, "rb") as f:
        file_base64 = base64.b64encode(f.read()).decode("utf-8")

    payload = {
        "file": {
            "file_base64": file_base64,
            "file_name": os.path.basename(file_path)
        },
        "schema": schema,
        "extract_options": {
            "generate_citations": generate_citations,
            "stamp": stamp
        }
    }

    headers = {
        "x-ti-app-id": os.getenv("TEXTIN_APP_ID"),
        "x-ti-secret-code": os.getenv("TEXTIN_SECRET_CODE"),
        "Content-Type": "application/json"
    }

    response = requests.post(EXTRACT_API_URL, json=payload, headers=headers)
    result = response.json()

    if result.get("code") != 200:
        raise Exception(f"Extract API 错误: {result.get('message', '未知错误')}")

    return result["result"]

def _resolve_file_path(file_path: str = None) -> str:
    """解析文件路径，返回有效路径或 None"""
    if file_path in ("None", "none", None, "", "null"):
        return None
    if os.path.exists(file_path):
        return file_path
    return None

Step 2：构建 LangChain Tools

定义提取 Schema

为每种文档类型定义专属的 JSON Schema，精确控制提取字段：

INVOICE_SCHEMA = {
    "type": "object",
    "properties": {
        "发票基本信息": {
            "type": "object",
            "properties": {
                "发票代码": {"type": ["string", "null"], "description": "发票代码"},
                "发票号码": {"type": ["string", "null"], "description": "发票号码"},
                "开票日期": {"type": ["string", "null"], "description": "开票日期"}
            }
        },
        "销售方": {
            "type": "object",
            "properties": {
                "名称": {"type": ["string", "null"], "description": "销售方名称"},
                "纳税人识别号": {"type": ["string", "null"], "description": "纳税人识别号"},
                "地址电话": {"type": ["string", "null"], "description": "地址电话"},
                "开户行及账号": {"type": ["string", "null"], "description": "开户行及账号"}
            }
        },
        "购买方": {
            "type": "object",
            "properties": {
                "名称": {"type": ["string", "null"], "description": "购买方名称"},
                "纳税人识别号": {"type": ["string", "null"], "description": "纳税人识别号"},
                "地址电话": {"type": ["string", "null"], "description": "地址电话"},
                "开户行及账号": {"type": ["string", "null"], "description": "开户行及账号"}
            }
        },
        "商品明细": {
            "type": "array",
            "description": "商品明细列表",
            "items": {
                "type": "object",
                "properties": {
                    "名称": {"type": ["string", "null"], "description": "商品名称"},
                    "规格型号": {"type": ["string", "null"], "description": "规格型号"},
                    "单位": {"type": ["string", "null"], "description": "单位"},
                    "数量": {"type": ["string", "null"], "description": "数量"},
                    "单价": {"type": ["string", "null"], "description": "单价"},
                    "金额": {"type": ["string", "null"], "description": "金额"},
                    "税率": {"type": ["string", "null"], "description": "税率"},
                    "税额": {"type": ["string", "null"], "description": "税额"}
                },
                "required": ["名称", "规格型号","单位","数量","单价","金额","税率","税额"]
            }
        },
        "金额信息": {
            "type": "object",
            "properties": {
                "合计金额": {"type": ["string", "null"], "description": "合计金额"},
                "合计税额": {"type": ["string", "null"], "description": "合计税额"},
                "价税合计": {"type": ["string", "null"], "description": "价税合计（大写）"}
            }
        },
        "其他信息": {
            "type": "object",
            "properties": {
                "备注": {"type": ["string", "null"], "description": "备注"},
                "收款人": {"type": ["string", "null"], "description": "收款人"},
                "复核人": {"type": ["string", "null"], "description": "复核人"},
                "开票人": {"type": ["string", "null"], "description": "开票人"}
            }
        }
    },
    "required": ["销售方", "购买方", "商品明细", "金额信息", "其他信息","发票基本信息"]
}

MEDICAL_BILL_SCHEMA = {
    "type": "object",
    "properties": {
        "患者信息": {
            "type": "object",
            "properties": {
                "姓名": {"type": ["string", "null"], "description": "患者姓名"},
                "性别": {"type": ["string", "null"], "description": "性别"},
                "年龄": {"type": ["string", "null"], "description": "年龄"},
                "身份证号": {"type": ["string", "null"], "description": "身份证号"},
                "医保卡号": {"type": ["string", "null"], "description": "医保卡号"}
            }
        },
        "医疗机构信息": {
            "type": "object",
            "properties": {
                "医院名称": {"type": ["string", "null"], "description": "医院名称"},
                "科室": {"type": ["string", "null"], "description": "科室"},
                "医生姓名": {"type": ["string", "null"], "description": "医生姓名"}
            }
        },
        "就诊信息": {
            "type": "object",
            "properties": {
                "就诊日期": {"type": ["string", "null"], "description": "就诊日期"},
                "就诊类型": {"type": ["string", "null"], "description": "门诊/住院"},
                "诊断结果": {"type": ["string", "null"], "description": "诊断结果"}
            }
        },
        "费用明细": {
            "type": "array",
            "description": "费用明细列表",
            "items": {
                "type": "object",
                "properties": {
                    "项目名称": {"type": ["string", "null"], "description": "项目名称"},
                    "数量": {"type": ["string", "null"], "description": "数量"},
                    "单价": {"type": ["string", "null"], "description": "单价"},
                    "金额": {"type": ["string", "null"], "description": "金额"},
                    "医保类型": {"type": ["string", "null"], "description": "甲类/乙类/丙类"}
                },
                "required": ["项目名称", "金额","数量","单价","医保类型"]
            }
        },
        "费用汇总": {
            "type": "object",
            "properties": {
                "总费用": {"type": ["string", "null"], "description": "总费用"},
                "自费金额": {"type": ["string", "null"], "description": "自费金额"},
                "医保支付": {"type": ["string", "null"], "description": "医保支付金额"},
                "个人支付": {"type": ["string", "null"], "description": "个人支付金额"}
            }
        },
        "其他信息": {
            "type": "object",
            "properties": {
                "发票号码": {"type": ["string", "null"], "description": "发票号码"},
                "结算方式": {"type": ["string", "null"], "description": "结算方式"}
            }
        }
    },
    "required": ["就诊信息", "费用明细", "费用汇总", "其他信息","医疗机构信息","患者信息"]
}

CONTRACT_SCHEMA = {
  "type": "object",
  "properties": {
    "合同基本信息": {
      "type": "object",
      "description": "",
      "required": ["合同编号","合同名称","签订日期","生效日期","到期日期"],
      "properties": {
        "合同编号": {
          "type": [
            "string",
            "null"
          ],
          "description": ""
        },
        "合同名称": {
          "type": [
            "string",
            "null"
          ],
          "description": ""
        },
        "签订日期": {
          "type": [
            "string",
            "null"
          ],
          "description": ""
        },
        "生效日期": {
          "type": [
            "string",
            "null"
          ],
          "description": ""
        },
        "到期日期": {
          "type": [
            "string",
            "null"
          ],
          "description": ""
        }
      }
    },
    "合同双方": {
      "type": "object",
      "description": "",
      "required": [
        "甲方-名称",
        "甲方-地址",
        "甲方-法定代表人",
        "甲方-联系方式",
        "乙方-名称",
        "乙方-地址",
        "乙方-法定代表人",
        "乙方-联系方式"
      ],
      "properties": {
        "甲方-名称": {
          "type": [
            "string",
            "null"
          ],
          "description": ""
        },
        "甲方-地址": {
          "type": [
            "string",
            "null"
          ],
          "description": ""
        },
        "甲方-法定代表人": {
          "type": [
            "string",
            "null"
          ],
          "description": ""
        },
        "甲方-联系方式": {
          "type": [
            "string",
            "null"
          ],
          "description": ""
        },
        "乙方-名称": {
          "type": [
            "string",
            "null"
          ],
          "description": ""
        },
        "乙方-地址": {
          "type": [
            "string",
            "null"
          ],
          "description": ""
        },
        "乙方-法定代表人": {
          "type": [
            "string",
            "null"
          ],
          "description": ""
        },
        "乙方-联系方式": {
          "type": [
            "string",
            "null"
          ],
          "description": ""
        }
      }
    },
    "合同标的": {
      "type": "object",
      "description": "",
      "required": [
        "标的物",
        "数量",
        "金额"
      ],
      "properties": {
        "标的物": {
          "type": [
            "string",
            "null"
          ],
          "description": ""
        },
        "数量": {
          "type": [
            "string",
            "null"
          ],
          "description": ""
        },
        "金额": {
          "type": [
            "string",
            "null"
          ],
          "description": ""
        }
      }
    },
    "关键条款": {
      "type": "object",
      "description": "",
      "required": [
        "付款方式",
        "交付方式",
        "违约责任",
        "争议解决"
      ],
      "properties": {
        "付款方式": {
          "type": [
            "string",
            "null"
          ],
          "description": ""
        },
        "交付方式": {
          "type": [
            "string",
            "null"
          ],
          "description": ""
        },
        "违约责任": {
          "type": [
            "string",
            "null"
          ],
          "description": ""
        },
        "争议解决": {
          "type": [
            "string",
            "null"
          ],
          "description": ""
        }
      }
    },
    "金额信息": {
      "type": "object",
      "description": "",
      "required": [
        "合同总金额",
        "付款计划",
        "保证金"
      ],
      "properties": {
        "合同总金额": {
          "type": [
            "string",
            "null"
          ],
          "description": ""
        },
        "付款计划": {
          "type": [
            "string",
            "null"
          ],
          "description": ""
        },
        "保证金": {
          "type": [
            "string",
            "null"
          ],
          "description": ""
        }
      }
    }
  },
  "required": [
    "合同基本信息",
    "合同双方",
    "合同标的",
    "关键条款",
    "金额信息"
  ]
}

RESUME_SCHEMA = {
    "type": "object",
    "properties": {
        "个人信息": {
            "type": "object",
            "properties": {
                "姓名": {"type": ["string", "null"], "description": "姓名"},
                "性别": {"type": ["string", "null"], "description": "性别"},
                "年龄": {"type": ["string", "null"], "description": "年龄"},
                "电话": {"type": ["string", "null"], "description": "电话"},
                "邮箱": {"type": ["string", "null"], "description": "邮箱"},
                "地址": {"type": ["string", "null"], "description": "地址"}
            }
        },
        "教育经历": {
            "type": "array",
            "description": "教育经历列表",
            "items": {
                "type": "object",
                "properties": {
                    "学校": {"type": ["string", "null"], "description": "学校名称"},
                    "专业": {"type": ["string", "null"], "description": "专业"},
                    "学历": {"type": ["string", "null"], "description": "学历（本科/硕士/博士等）"},
                    "入学时间": {"type": ["string", "null"], "description": "入学时间"},
                    "毕业时间": {"type": ["string", "null"], "description": "毕业时间"}
                },
                "required": ["学校","专业","学历","入学时间","毕业时间"]
            }
        },
        "工作经历": {
            "type": "array",
            "description": "工作经历列表",
            "items": {
                "type": "object",
                "properties": {
                    "公司": {"type": ["string", "null"], "description": "公司名称"},
                    "职位": {"type": ["string", "null"], "description": "职位"},
                    "入职时间": {"type": ["string", "null"], "description": "入职时间"},
                    "离职时间": {"type": ["string", "null"], "description": "离职时间"},
                    "工作内容": {"type": ["string", "null"], "description": "主要工作内容"}
                },
                "required": ["公司","职位","入职时间","离职时间","工作内容"]
            }
        },
        "技能": {
            "type": "object",
            "properties": {
                "专业技能": {"type": "array", "items": {"type": "string"}, "description": "专业技能列表"},
                "语言能力": {"type": "array", "items": {"type": "string"}, "description": "语言能力列表"},
                "证书": {"type": "array", "items": {"type": "string"}, "description": "证书列表"}
            }
        }
    },
    "required": ["技能","工作经历","教育经历","个人信息"]
}

PRODUCT_SPECS_SCHEMA = {
    "type": "object",
    "properties": {
        "产品名称": {"type": ["string", "null"], "description": "产品名称"},
        "型号": {"type": ["string", "null"], "description": "产品型号"},
        "技术参数": {
            "type": "array",
            "description": "技术参数列表",
            "items": {
                "type": "object",
                "properties": {
                    "参数名": {"type": ["string", "null"], "description": "参数名称"},
                    "参数值": {"type": ["string", "null"], "description": "参数值"},
                    "单位": {"type": ["string", "null"], "description": "单位"}
                },
                "required": ["参数名", "参数值","单位"]
            }
        },
        "功能特性": {
            "type": "array",
            "items": {"type": "string"},
            "description": "功能特性列表"
        },
        "价格信息": {
            "type": "object",
            "properties": {
                "价格": {"type": ["string", "null"], "description": "价格"},
                "币种": {"type": ["string", "null"], "description": "币种"}
            }
        }
    },
    "required": ["产品名称","型号","技术参数","功能特性","价格信息"]
}

API_INFO_SCHEMA = {
    "type": "object",
    "properties": {
        "接口列表": {
            "type": "array",
            "description": "API 接口列表",
            "items": {
                "type": "object",
                "properties": {
                    "端点": {"type": ["string", "null"], "description": "API 端点 URL"},
                    "请求方法": {"type": ["string", "null"], "description": "GET/POST/PUT/DELETE"},
                    "描述": {"type": ["string", "null"], "description": "接口描述"},
                    "响应格式": {"type": ["string", "null"], "description": "响应数据格式描述"},
                    "认证方式": {"type": ["string", "null"], "description": "认证方式"}
                },
                "required": ["端点", "请求方法","描述","响应格式","认证方式"]
            }
        }
    },
    "required": ["接口列表"]
}

KEY_VALUE_SCHEMA = {
    "type": "object",
    "properties": {
        "键值对列表": {
            "type": "array",
            "description": "从文档中提取的所有键值对",
            "items": {
                "type": "object",
                "properties": {
                    "键": {"type": ["string", "null"], "description": "键名"},
                    "值": {"type": ["string", "null"], "description": "对应的值"}
                },
                "required": ["键", "值"]
            }
        }
    },
    "required": ["键值对列表"]
}

Tool 1: 提取发票信息

from langchain_core.tools import Tool

def extract_invoice_info(file_path: str = None) -> str:
    """
    从发票中提取结构化信息（使用 xParse Extract API）

    提取内容包括：
    - 发票基本信息（发票代码、发票号码、开票日期）
    - 销售方信息（名称、纳税人识别号、地址电话、开户行及账号）
    - 购买方信息（名称、纳税人识别号、地址电话、开户行及账号）
    - 商品明细（名称、规格、单位、数量、单价、金额、税率、税额）
    - 金额信息（合计金额、合计税额、价税合计）
    - 其他信息（备注、收款人、复核人、开票人等）

    Args:
        file_path: 文档路径
    """
    fp = _resolve_file_path(file_path)
    if not fp:
        return "错误：请提供有效的文档路径。"
    result = extract_from_file(fp, INVOICE_SCHEMA)
    return json.dumps(result["extracted_schema"], ensure_ascii=False, indent=2)

Tool 2: 提取医疗票据信息

def extract_medical_bill_info(file_path: str = None) -> str:
    """
    从医疗票据中提取结构化信息（使用 xParse Extract API）

    提取内容包括：
    - 患者信息（姓名、性别、年龄、身份证号、医保卡号）
    - 医疗机构信息（医院名称、科室、医生姓名）
    - 就诊信息（就诊日期、就诊类型、诊断结果）
    - 费用明细（项目名称、数量、单价、金额、医保类型）
    - 费用汇总（总费用、自费金额、医保支付、个人支付）

    Args:
        file_path: 文档路径
    """
    fp = _resolve_file_path(file_path)
    if not fp:
        return "错误：请提供有效的文档路径。"
    result = extract_from_file(fp, MEDICAL_BILL_SCHEMA)
    return json.dumps(result["extracted_schema"], ensure_ascii=False, indent=2)

Tool 3: 提取合同信息

def extract_contract_info(file_path: str = None) -> str:
    """
    从合同中提取结构化信息（使用 xParse Extract API）

    提取内容包括：
    - 合同基本信息（合同编号、合同名称、签订日期、生效日期、到期日期）
    - 合同双方（甲方、乙方：名称、地址、法定代表人、联系方式）
    - 合同标的（标的物、数量、金额）
    - 关键条款（付款方式、交付方式、违约责任、争议解决）
    - 金额信息（合同总金额、付款计划、保证金）

    Args:
        file_path: 文档路径
    """
    fp = _resolve_file_path(file_path)
    if not fp:
        return "错误：请提供有效的文档路径。"
    result = extract_from_file(fp, CONTRACT_SCHEMA)
    return json.dumps(result["extracted_schema"], ensure_ascii=False, indent=2)

Tool 4: 提取简历信息

def extract_resume_info(file_path: str = None) -> str:
    """
    从简历中提取结构化信息（使用 xParse Extract API）

    提取内容包括：
    - 个人信息（姓名、性别、年龄、联系方式）
    - 教育经历（学校、专业、学历、时间）
    - 工作经历（公司、职位、时间、工作内容）
    - 技能（专业技能、语言能力、证书等）

    Args:
        file_path: 文档路径
    """
    fp = _resolve_file_path(file_path)
    if not fp:
        return "错误：请提供有效的文档路径。"
    result = extract_from_file(fp, RESUME_SCHEMA)
    return json.dumps(result["extracted_schema"], ensure_ascii=False, indent=2)

Tool 5: 提取产品规格

def extract_product_specs(file_path: str = None) -> str:
    """
    从产品文档中提取产品规格和技术参数（使用 xParse Extract API）

    提取内容包括：
    - 产品名称和型号
    - 技术参数（尺寸、重量、性能指标等）
    - 功能特性
    - 价格信息

    Args:
        file_path: 文档路径
    """
    fp = _resolve_file_path(file_path)
    if not fp:
        return "错误：请提供有效的文档路径。"
    result = extract_from_file(fp, PRODUCT_SPECS_SCHEMA)
    return json.dumps(result["extracted_schema"], ensure_ascii=False, indent=2)

Tool 6: 提取 API 信息

def extract_api_info(file_path: str = None) -> str:
    """
    从技术文档中提取 API 接口信息（使用 xParse Extract API）

    提取内容包括：
    - API端点（URL路径）
    - 请求方法（GET、POST等）
    - 请求参数
    - 响应格式
    - 认证方式

    Args:
        file_path: 文档路径
    """
    fp = _resolve_file_path(file_path)
    if not fp:
        return "错误：请提供有效的文档路径。"
    result = extract_from_file(fp, API_INFO_SCHEMA)
    return json.dumps(result["extracted_schema"], ensure_ascii=False, indent=2)

Tool 7: 数据格式化

import pandas as pd

def format_data(file_path: str = None) -> str:
    """
    从文档中提取键值对并格式化为标准格式（JSON、CSV等）

    使用 xParse Extract API 提取文档中的所有键值对信息，
    并转换为 JSON 和 CSV 格式。

    Args:
        file_path: 文档路径
    """
    fp = _resolve_file_path(file_path)
    if not fp:
        return "错误：请提供有效的文档路径。"

    result = extract_from_file(fp, KEY_VALUE_SCHEMA)
    extracted = result["extracted_schema"]
    data_list = extracted.get("键值对列表", [])

    if not data_list:
        return "未找到可格式化的数据"

    json_output = json.dumps(data_list, ensure_ascii=False, indent=2)

    try:
        df = pd.DataFrame(data_list)
        csv_output = df.to_csv(index=False)
    except:
        csv_output = "CSV格式化失败"

    return f"JSON格式：\n{json_output}\n\nCSV格式：\n{csv_output}"

组装所有Tools

tools = [
    Tool(
        name="extract_invoice_info",
        description="从发票中提取结构化信息，包括发票基本信息、销售方/购买方信息、商品明细、金额信息等。需要提供文档路径作为参数。",
        func=extract_invoice_info
    ),
    Tool(
        name="extract_medical_bill_info",
        description="从医疗票据中提取结构化信息，包括患者信息、医疗机构信息、就诊信息、费用明细、费用汇总等。需要提供文档路径作为参数。",
        func=extract_medical_bill_info
    ),
    Tool(
        name="extract_contract_info",
        description="从合同中提取结构化信息，包括合同基本信息、合同双方信息、合同标的、关键条款、金额信息等。需要提供文档路径作为参数。",
        func=extract_contract_info
    ),
    Tool(
        name="extract_resume_info",
        description="从简历中提取结构化信息，包括个人信息、教育经历、工作经历、技能等。需要提供文档路径作为参数。",
        func=extract_resume_info
    ),
    Tool(
        name="extract_product_specs",
        description="从产品文档中提取产品规格和技术参数，包括产品名称、型号、技术参数、功能特性、价格等。需要提供文档路径作为参数。",
        func=extract_product_specs
    ),
    Tool(
        name="extract_api_info",
        description="从技术文档中提取API接口信息，包括API端点、请求方法、请求参数、响应格式等。需要提供文档路径作为参数。",
        func=extract_api_info
    ),
    Tool(
        name="format_data",
        description="从文档中提取键值对信息并格式化为标准格式（JSON、CSV等）。需要提供文档路径作为参数。",
        func=format_data
    )
]

Step 3：配置 LangChain Agent

from langchain_classic.agents import AgentType, initialize_agent
from langchain_community.chat_models import ChatTongyi

llm = ChatTongyi(
    model="qwen-max",
    dashscope_api_key=os.getenv("DASHSCOPE_API_KEY"),
    temperature=0.2,
)

agent_executor = initialize_agent(
    tools=tools,
    llm=llm,
    agent=AgentType.ZERO_SHOT_REACT_DESCRIPTION,
    verbose=True,
    agent_kwargs={
        "prefix": """你是一个专业的信息提取助手。你的任务是帮助用户：
1. 从文档中提取结构化信息（发票、医疗票据、合同、简历、产品规格、API接口等）
2. 将提取的信息格式化为标准格式（JSON、CSV等）
3. 验证提取数据的完整性和准确性

在回答时，请：
- 提供结构化的提取结果
- 使用JSON或表格格式展示数据
- 如果数据不完整，说明缺失的部分
- 使用工具获取准确的信息，不要猜测
- 对于财务类文档（发票、医疗票据），确保金额和税务信息的准确性
- 对于合同文档，重点关注关键条款和风险点
- 所有工具都需要提供文档文件路径作为参数
"""
    }
)

Step 4：完整示例代码

#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
信息提取Agent完整示例
"""

import os
import json
import base64
import requests
import pandas as pd
from dotenv import load_dotenv
from langchain_core.tools import Tool
from langchain_classic.agents import AgentType, initialize_agent
from langchain_community.chat_models import ChatTongyi

load_dotenv()

EXTRACT_API_URL = "https://api.textin.com/ai/service/v3/entity_extraction"

INVOICE_SCHEMA = {
    "type": "object",
    "properties": {
        "发票基本信息": {
            "type": "object",
            "properties": {
                "发票代码": {"type": ["string", "null"], "description": "发票代码"},
                "发票号码": {"type": ["string", "null"], "description": "发票号码"},
                "开票日期": {"type": ["string", "null"], "description": "开票日期"}
            }
        },
        "销售方": {
            "type": "object",
            "properties": {
                "名称": {"type": ["string", "null"], "description": "销售方名称"},
                "纳税人识别号": {"type": ["string", "null"], "description": "纳税人识别号"},
                "地址电话": {"type": ["string", "null"], "description": "地址电话"},
                "开户行及账号": {"type": ["string", "null"], "description": "开户行及账号"}
            }
        },
        "购买方": {
            "type": "object",
            "properties": {
                "名称": {"type": ["string", "null"], "description": "购买方名称"},
                "纳税人识别号": {"type": ["string", "null"], "description": "纳税人识别号"},
                "地址电话": {"type": ["string", "null"], "description": "地址电话"},
                "开户行及账号": {"type": ["string", "null"], "description": "开户行及账号"}
            }
        },
        "商品明细": {
            "type": "array",
            "description": "商品明细列表",
            "items": {
                "type": "object",
                "properties": {
                    "名称": {"type": ["string", "null"], "description": "商品名称"},
                    "规格型号": {"type": ["string", "null"], "description": "规格型号"},
                    "单位": {"type": ["string", "null"], "description": "单位"},
                    "数量": {"type": ["string", "null"], "description": "数量"},
                    "单价": {"type": ["string", "null"], "description": "单价"},
                    "金额": {"type": ["string", "null"], "description": "金额"},
                    "税率": {"type": ["string", "null"], "description": "税率"},
                    "税额": {"type": ["string", "null"], "description": "税额"}
                },
                "required": ["名称", "规格型号","单位","数量","单价","金额","税率","税额"]
            }
        },
        "金额信息": {
            "type": "object",
            "properties": {
                "合计金额": {"type": ["string", "null"], "description": "合计金额"},
                "合计税额": {"type": ["string", "null"], "description": "合计税额"},
                "价税合计": {"type": ["string", "null"], "description": "价税合计（大写）"}
            }
        },
        "其他信息": {
            "type": "object",
            "properties": {
                "备注": {"type": ["string", "null"], "description": "备注"},
                "收款人": {"type": ["string", "null"], "description": "收款人"},
                "复核人": {"type": ["string", "null"], "description": "复核人"},
                "开票人": {"type": ["string", "null"], "description": "开票人"}
            }
        }
    },
    "required": ["销售方", "购买方", "商品明细", "金额信息", "其他信息","发票基本信息"]
}

MEDICAL_BILL_SCHEMA = {
    "type": "object",
    "properties": {
        "患者信息": {
            "type": "object",
            "properties": {
                "姓名": {"type": ["string", "null"], "description": "患者姓名"},
                "性别": {"type": ["string", "null"], "description": "性别"},
                "年龄": {"type": ["string", "null"], "description": "年龄"},
                "身份证号": {"type": ["string", "null"], "description": "身份证号"},
                "医保卡号": {"type": ["string", "null"], "description": "医保卡号"}
            }
        },
        "医疗机构信息": {
            "type": "object",
            "properties": {
                "医院名称": {"type": ["string", "null"], "description": "医院名称"},
                "科室": {"type": ["string", "null"], "description": "科室"},
                "医生姓名": {"type": ["string", "null"], "description": "医生姓名"}
            }
        },
        "就诊信息": {
            "type": "object",
            "properties": {
                "就诊日期": {"type": ["string", "null"], "description": "就诊日期"},
                "就诊类型": {"type": ["string", "null"], "description": "门诊/住院"},
                "诊断结果": {"type": ["string", "null"], "description": "诊断结果"}
            }
        },
        "费用明细": {
            "type": "array",
            "description": "费用明细列表",
            "items": {
                "type": "object",
                "properties": {
                    "项目名称": {"type": ["string", "null"], "description": "项目名称"},
                    "数量": {"type": ["string", "null"], "description": "数量"},
                    "单价": {"type": ["string", "null"], "description": "单价"},
                    "金额": {"type": ["string", "null"], "description": "金额"},
                    "医保类型": {"type": ["string", "null"], "description": "甲类/乙类/丙类"}
                },
                "required": ["项目名称", "金额","数量","单价","医保类型"]
            }
        },
        "费用汇总": {
            "type": "object",
            "properties": {
                "总费用": {"type": ["string", "null"], "description": "总费用"},
                "自费金额": {"type": ["string", "null"], "description": "自费金额"},
                "医保支付": {"type": ["string", "null"], "description": "医保支付金额"},
                "个人支付": {"type": ["string", "null"], "description": "个人支付金额"}
            }
        },
        "其他信息": {
            "type": "object",
            "properties": {
                "发票号码": {"type": ["string", "null"], "description": "发票号码"},
                "结算方式": {"type": ["string", "null"], "description": "结算方式"}
            }
        }
    },
    "required": ["就诊信息", "费用明细", "费用汇总", "其他信息","医疗机构信息","患者信息"]
}

CONTRACT_SCHEMA = {
  "type": "object",
  "properties": {
    "合同基本信息": {
      "type": "object",
      "description": "",
      "required": ["合同编号","合同名称","签订日期","生效日期","到期日期"],
      "properties": {
        "合同编号": {
          "type": [
            "string",
            "null"
          ],
          "description": ""
        },
        "合同名称": {
          "type": [
            "string",
            "null"
          ],
          "description": ""
        },
        "签订日期": {
          "type": [
            "string",
            "null"
          ],
          "description": ""
        },
        "生效日期": {
          "type": [
            "string",
            "null"
          ],
          "description": ""
        },
        "到期日期": {
          "type": [
            "string",
            "null"
          ],
          "description": ""
        }
      }
    },
    "合同双方": {
      "type": "object",
      "description": "",
      "required": [
        "甲方-名称",
        "甲方-地址",
        "甲方-法定代表人",
        "甲方-联系方式",
        "乙方-名称",
        "乙方-地址",
        "乙方-法定代表人",
        "乙方-联系方式"
      ],
      "properties": {
        "甲方-名称": {
          "type": [
            "string",
            "null"
          ],
          "description": ""
        },
        "甲方-地址": {
          "type": [
            "string",
            "null"
          ],
          "description": ""
        },
        "甲方-法定代表人": {
          "type": [
            "string",
            "null"
          ],
          "description": ""
        },
        "甲方-联系方式": {
          "type": [
            "string",
            "null"
          ],
          "description": ""
        },
        "乙方-名称": {
          "type": [
            "string",
            "null"
          ],
          "description": ""
        },
        "乙方-地址": {
          "type": [
            "string",
            "null"
          ],
          "description": ""
        },
        "乙方-法定代表人": {
          "type": [
            "string",
            "null"
          ],
          "description": ""
        },
        "乙方-联系方式": {
          "type": [
            "string",
            "null"
          ],
          "description": ""
        }
      }
    },
    "合同标的": {
      "type": "object",
      "description": "",
      "required": [
        "标的物",
        "数量",
        "金额"
      ],
      "properties": {
        "标的物": {
          "type": [
            "string",
            "null"
          ],
          "description": ""
        },
        "数量": {
          "type": [
            "string",
            "null"
          ],
          "description": ""
        },
        "金额": {
          "type": [
            "string",
            "null"
          ],
          "description": ""
        }
      }
    },
    "关键条款": {
      "type": "object",
      "description": "",
      "required": [
        "付款方式",
        "交付方式",
        "违约责任",
        "争议解决"
      ],
      "properties": {
        "付款方式": {
          "type": [
            "string",
            "null"
          ],
          "description": ""
        },
        "交付方式": {
          "type": [
            "string",
            "null"
          ],
          "description": ""
        },
        "违约责任": {
          "type": [
            "string",
            "null"
          ],
          "description": ""
        },
        "争议解决": {
          "type": [
            "string",
            "null"
          ],
          "description": ""
        }
      }
    },
    "金额信息": {
      "type": "object",
      "description": "",
      "required": [
        "合同总金额",
        "付款计划",
        "保证金"
      ],
      "properties": {
        "合同总金额": {
          "type": [
            "string",
            "null"
          ],
          "description": ""
        },
        "付款计划": {
          "type": [
            "string",
            "null"
          ],
          "description": ""
        },
        "保证金": {
          "type": [
            "string",
            "null"
          ],
          "description": ""
        }
      }
    }
  },
  "required": [
    "合同基本信息",
    "合同双方",
    "合同标的",
    "关键条款",
    "金额信息"
  ]
}

RESUME_SCHEMA = {
    "type": "object",
    "properties": {
        "个人信息": {
            "type": "object",
            "properties": {
                "姓名": {"type": ["string", "null"], "description": "姓名"},
                "性别": {"type": ["string", "null"], "description": "性别"},
                "年龄": {"type": ["string", "null"], "description": "年龄"},
                "电话": {"type": ["string", "null"], "description": "电话"},
                "邮箱": {"type": ["string", "null"], "description": "邮箱"},
                "地址": {"type": ["string", "null"], "description": "地址"}
            }
        },
        "教育经历": {
            "type": "array",
            "description": "教育经历列表",
            "items": {
                "type": "object",
                "properties": {
                    "学校": {"type": ["string", "null"], "description": "学校名称"},
                    "专业": {"type": ["string", "null"], "description": "专业"},
                    "学历": {"type": ["string", "null"], "description": "学历（本科/硕士/博士等）"},
                    "入学时间": {"type": ["string", "null"], "description": "入学时间"},
                    "毕业时间": {"type": ["string", "null"], "description": "毕业时间"}
                },
                "required": ["学校","专业","学历","入学时间","毕业时间"]
            }
        },
        "工作经历": {
            "type": "array",
            "description": "工作经历列表",
            "items": {
                "type": "object",
                "properties": {
                    "公司": {"type": ["string", "null"], "description": "公司名称"},
                    "职位": {"type": ["string", "null"], "description": "职位"},
                    "入职时间": {"type": ["string", "null"], "description": "入职时间"},
                    "离职时间": {"type": ["string", "null"], "description": "离职时间"},
                    "工作内容": {"type": ["string", "null"], "description": "主要工作内容"}
                },
                "required": ["公司","职位","入职时间","离职时间","工作内容"]
            }
        },
        "技能": {
            "type": "object",
            "properties": {
                "专业技能": {"type": "array", "items": {"type": "string"}, "description": "专业技能列表"},
                "语言能力": {"type": "array", "items": {"type": "string"}, "description": "语言能力列表"},
                "证书": {"type": "array", "items": {"type": "string"}, "description": "证书列表"}
            }
        }
    },
    "required": ["技能","工作经历","教育经历","个人信息"]
}

PRODUCT_SPECS_SCHEMA = {
    "type": "object",
    "properties": {
        "产品名称": {"type": ["string", "null"], "description": "产品名称"},
        "型号": {"type": ["string", "null"], "description": "产品型号"},
        "技术参数": {
            "type": "array",
            "description": "技术参数列表",
            "items": {
                "type": "object",
                "properties": {
                    "参数名": {"type": ["string", "null"], "description": "参数名称"},
                    "参数值": {"type": ["string", "null"], "description": "参数值"},
                    "单位": {"type": ["string", "null"], "description": "单位"}
                },
                "required": ["参数名", "参数值","单位"]
            }
        },
        "功能特性": {
            "type": "array",
            "items": {"type": "string"},
            "description": "功能特性列表"
        },
        "价格信息": {
            "type": "object",
            "properties": {
                "价格": {"type": ["string", "null"], "description": "价格"},
                "币种": {"type": ["string", "null"], "description": "币种"}
            }
        }
    },
    "required": ["产品名称","型号","技术参数","功能特性","价格信息"]
}

API_INFO_SCHEMA = {
    "type": "object",
    "properties": {
        "接口列表": {
            "type": "array",
            "description": "API 接口列表",
            "items": {
                "type": "object",
                "properties": {
                    "端点": {"type": ["string", "null"], "description": "API 端点 URL"},
                    "请求方法": {"type": ["string", "null"], "description": "GET/POST/PUT/DELETE"},
                    "描述": {"type": ["string", "null"], "description": "接口描述"},
                    "响应格式": {"type": ["string", "null"], "description": "响应数据格式描述"},
                    "认证方式": {"type": ["string", "null"], "description": "认证方式"}
                },
                "required": ["端点", "请求方法","描述","响应格式","认证方式"]
            }
        }
    },
    "required": ["接口列表"]
}

KEY_VALUE_SCHEMA = {
    "type": "object",
    "properties": {
        "键值对列表": {
            "type": "array",
            "description": "从文档中提取的所有键值对",
            "items": {
                "type": "object",
                "properties": {
                    "键": {"type": ["string", "null"], "description": "键名"},
                    "值": {"type": ["string", "null"], "description": "对应的值"}
                },
                "required": ["键", "值"]
            }
        }
    },
    "required": ["键值对列表"]
}


class InformationExtractionAgent:
    """信息提取Agent"""

    def __init__(self):
        self.setup_llm()
        self.setup_agent()

    def setup_llm(self):
        self.llm = ChatTongyi(
            model="qwen-max",
            dashscope_api_key=os.getenv("DASHSCOPE_API_KEY"),
            temperature=0,
        )

    @staticmethod
    def extract_from_file(file_path: str, schema: dict, generate_citations: bool = False, stamp: bool = False) -> dict:
        with open(file_path, "rb") as f:
            file_base64 = base64.b64encode(f.read()).decode("utf-8")

        payload = {
            "file": {
                "file_base64": file_base64,
                "file_name": os.path.basename(file_path)
            },
            "schema": schema,
            "extract_options": {
                "generate_citations": generate_citations,
                "stamp": stamp
            }
        }

        headers = {
            "x-ti-app-id": os.getenv("TEXTIN_APP_ID"),
            "x-ti-secret-code": os.getenv("TEXTIN_SECRET_CODE"),
            "Content-Type": "application/json"
        }

        response = requests.post(EXTRACT_API_URL, json=payload, headers=headers)
        result = response.json()

        if result.get("code") != 200:
            raise Exception(f"Extract API 错误: {result.get('message', '未知错误')}")

        return result["result"]

    @staticmethod
    def _resolve_file_path(file_path: str = None) -> str:
        if file_path in ("None", "none", None, "", "null"):
            return None
        if os.path.exists(file_path):
            return file_path
        return None

    def setup_agent(self):
        tools = [
            Tool(
                name="extract_invoice_info",
                description="从发票中提取结构化信息，包括发票基本信息、销售方/购买方信息、商品明细、金额信息等。需要提供文档路径作为参数。",
                func=self.extract_invoice_info
            ),
            Tool(
                name="extract_medical_bill_info",
                description="从医疗票据中提取结构化信息，包括患者信息、医疗机构信息、就诊信息、费用明细、费用汇总等。需要提供文档路径作为参数。",
                func=self.extract_medical_bill_info
            ),
            Tool(
                name="extract_contract_info",
                description="从合同中提取结构化信息，包括合同基本信息、合同双方信息、合同标的、关键条款、金额信息等。需要提供文档路径作为参数。",
                func=self.extract_contract_info
            ),
            Tool(
                name="extract_resume_info",
                description="从简历中提取结构化信息，包括个人信息、教育经历、工作经历、技能等。需要提供文档路径作为参数。",
                func=self.extract_resume_info
            ),
            Tool(
                name="extract_product_specs",
                description="从产品文档中提取产品规格和技术参数，包括产品名称、型号、技术参数、功能特性、价格等。需要提供文档路径作为参数。",
                func=self.extract_product_specs
            ),
            Tool(
                name="extract_api_info",
                description="从技术文档中提取API接口信息，包括API端点、请求方法、请求参数、响应格式等。需要提供文档路径作为参数。",
                func=self.extract_api_info
            ),
            Tool(
                name="format_data",
                description="从文档中提取键值对信息并格式化为标准格式（JSON、CSV等）。需要提供文档路径作为参数。",
                func=self.format_data
            )
        ]

        self.agent = initialize_agent(
            tools=tools,
            llm=self.llm,
            agent=AgentType.ZERO_SHOT_REACT_DESCRIPTION,
            verbose=True,
            agent_kwargs={
                "prefix": """你是一个专业的信息提取助手。你的任务是帮助用户：
1. 从文档中提取结构化信息（发票、医疗票据、合同、简历、产品规格、API接口等）
2. 将提取的信息格式化为标准格式（JSON、CSV等）
3. 验证提取数据的完整性和准确性

在回答时，请：
- 提供结构化的提取结果
- 使用JSON或表格格式展示数据
- 如果数据不完整，说明缺失的部分
- 使用工具获取准确的信息，不要猜测
- 对于财务类文档（发票、医疗票据），确保金额和税务信息的准确性
- 对于合同文档，重点关注关键条款和风险点
- 所有工具都需要提供文档文件路径作为参数
"""
            }
        )

    def extract_invoice_info(self, file_path: str = None) -> str:
        fp = self._resolve_file_path(file_path)
        if not fp:
            return "错误：请提供有效的文档路径。"
        result = self.extract_from_file(fp, INVOICE_SCHEMA)
        return json.dumps(result["extracted_schema"], ensure_ascii=False, indent=2)

    def extract_medical_bill_info(self, file_path: str = None) -> str:
        fp = self._resolve_file_path(file_path)
        if not fp:
            return "错误：请提供有效的文档路径。"
        result = self.extract_from_file(fp, MEDICAL_BILL_SCHEMA)
        return json.dumps(result["extracted_schema"], ensure_ascii=False, indent=2)

    def extract_contract_info(self, file_path: str = None) -> str:
        fp = self._resolve_file_path(file_path)
        if not fp:
            return "错误：请提供有效的文档路径。"
        result = self.extract_from_file(fp, CONTRACT_SCHEMA)
        return json.dumps(result["extracted_schema"], ensure_ascii=False, indent=2)

    def extract_resume_info(self, file_path: str = None) -> str:
        fp = self._resolve_file_path(file_path)
        if not fp:
            return "错误：请提供有效的文档路径。"
        result = self.extract_from_file(fp, RESUME_SCHEMA)
        return json.dumps(result["extracted_schema"], ensure_ascii=False, indent=2)

    def extract_product_specs(self, file_path: str = None) -> str:
        fp = self._resolve_file_path(file_path)
        if not fp:
            return "错误：请提供有效的文档路径。"
        result = self.extract_from_file(fp, PRODUCT_SPECS_SCHEMA)
        return json.dumps(result["extracted_schema"], ensure_ascii=False, indent=2)

    def extract_api_info(self, file_path: str = None) -> str:
        fp = self._resolve_file_path(file_path)
        if not fp:
            return "错误：请提供有效的文档路径。"
        result = self.extract_from_file(fp, API_INFO_SCHEMA)
        return json.dumps(result["extracted_schema"], ensure_ascii=False, indent=2)

    def format_data(self, file_path: str = None) -> str:
        fp = self._resolve_file_path(file_path)
        if not fp:
            return "错误：请提供有效的文档路径。"

        result = self.extract_from_file(fp, KEY_VALUE_SCHEMA)
        extracted = result["extracted_schema"]
        data_list = extracted.get("键值对列表", [])

        if not data_list:
            return "未找到可格式化的数据"

        json_output = json.dumps(data_list, ensure_ascii=False, indent=2)

        try:
            df = pd.DataFrame(data_list)
            csv_output = df.to_csv(index=False)
        except:
            csv_output = "CSV格式化失败"

        return f"JSON格式：\n{json_output}\n\nCSV格式：\n{csv_output}"

    def query(self, question: str) -> str:
        """查询 Agent，获取响应结果"""
        response = self.agent.invoke({"input": question})
        return response["output"]


def main():
    agent = InformationExtractionAgent()

    questions = [
        "从 ./extraction_documents/invoice.pdf 中提取发票代码、发票号码、销售方和购买方信息、商品明细和金额",
        # "从 ./extraction_documents/medical_bill.pdf 中提取患者信息、医院信息、诊断结果和费用明细",
        # "从 ./extraction_documents/contract.pdf 中提取合同编号、合同双方信息、合同金额和关键条款",
        # "从 ./extraction_documents/resume.pdf 中提取所有个人信息、教育经历和工作经历",
        # "从 ./extraction_documents/product_spec.pdf 中提取产品规格和技术参数",
        # "从 ./extraction_documents/api_docs.pdf 中提取所有API接口信息",
        "将 ./extraction_documents/invoice.pdf 中的数据格式化为JSON格式"
    ]

    for question in questions:
        print(f"\n{'='*60}")
        print(f"问题: {question}")
        print(f"{'='*60}")
        answer = agent.query(question)
        print(f"\n回答:\n{answer}")

if __name__ == "__main__":
    main()

使用示例

示例1：提取发票信息

agent = InformationExtractionAgent()

response = agent.query("从 ./extraction_documents/invoice.pdf 中提取发票代码、发票号码、销售方和购买方信息、商品明细和金额")
print(response)

示例2：提取医疗票据信息

response = agent.query("从 ./extraction_documents/medical_bill.pdf 中提取患者姓名、医院名称、诊断结果、总费用和医保支付金额")
print(response)

示例3：提取合同信息

response = agent.query("从 ./extraction_documents/contract.pdf 中提取合同编号、甲方和乙方信息、合同金额、付款方式和违约责任")
print(response)

示例4：提取简历信息

response = agent.query("从 ./extraction_documents/resume.pdf 中提取姓名、联系方式、教育经历和工作经历")
print(response)

示例5：提取产品规格

response = agent.query("从 ./extraction_documents/product_spec.pdf 中提取产品名称、型号、技术参数和价格")
print(response)

示例6：提取API信息

response = agent.query("从 ./extraction_documents/api_docs.pdf 中提取所有API端点、请求方法和参数")
print(response)

最佳实践

Schema 设计：为每种文档类型设计专属的 JSON Schema，精确定义需要提取的字段、类型和约束，确保输出格式一致
批量处理：支持批量处理多个文档，提高效率
格式标准化：将提取的数据转换为标准格式（JSON、CSV），便于后续处理
财务文档处理：
- 发票提取时重点关注发票代码、号码、金额等关键信息
- 医疗票据提取时注意区分自费、医保支付等不同费用类型
- 确保金额计算的准确性，支持财务系统对接
合同文档处理：
- 重点关注合同双方信息、合同金额、关键条款
- 识别违约责任、争议解决等重要条款
- 提取合同有效期，便于合同管理
引用溯源：对需要审核的场景，可以在调用 extract_from_file 时设置 generate_citations=True，获取提取结果在原文中的引用位置
错误处理：对提取失败的情况进行记录和人工复核，检查 API 返回的错误信息
性能优化：Extract API 在服务端完成解析和抽取，无需本地部署解析引擎，适合大规模批量处理

常见问题

Q: 如何提高提取准确率？
A: 1) 优化 JSON Schema，精确定义字段和描述信息；2) 确保文档清晰，避免模糊或低质量的扫描件；3) 对提取结果进行验证和校验。 Q: 如何处理格式不统一的文档？
A: 1) Extract API 支持多种文档格式（PDF、Word、Excel、图片等），会自动处理格式差异；2) 通过 Schema 统一输出格式；3) 人工校验和修正。 Q: 如何批量处理大量文档？
A: 1) 遍历文档目录，逐个调用提取工具；2) 并行处理多个文档（使用多线程或异步）；3) 使用队列管理任务，避免并发过高。 Q: 发票信息提取不准确怎么办？
A: 1) 确保发票图片清晰；2) 优化 Schema 中的字段描述；3) 启用 generate_citations=True 检查引用位置，排查问题字段；4) 对于特殊格式的发票，可以调整 Schema 适配。 Q: 医疗票据的费用明细如何提取？
A: 1) MEDICAL_BILL_SCHEMA 已定义费用明细数组，包含项目名称、数量、单价、金额、医保类型等字段；2) 费用汇总包含总费用、自费金额、医保支付、个人支付等；3) Extract API 能自动识别表格结构。 Q: 合同关键条款如何识别？
A: 1) CONTRACT_SCHEMA 已定义关键条款字段（付款方式、交付方式、违约责任、争议解决）；2) 可以根据业务需求扩展 Schema，添加更多条款字段；3) 启用 citations 获取条款在原文中的位置。

导览

xParse + LangChain 构建 Agent

RAG 应用

Dify 平台集成

示例 Demo

信息提取 Agent：结构化数据提取与整理

场景介绍

业务痛点

解决方案

架构设计

环境准备

Step 1：配置 Extract API

Step 2：构建 LangChain Tools

定义提取 Schema

Tool 1: 提取发票信息

Tool 2: 提取医疗票据信息

Tool 3: 提取合同信息

Tool 4: 提取简历信息

Tool 5: 提取产品规格

Tool 6: 提取 API 信息

Tool 7: 数据格式化

组装所有Tools

Step 3：配置 LangChain Agent

Step 4：完整示例代码

使用示例

示例1：提取发票信息

示例2：提取医疗票据信息

示例3：提取合同信息

示例4：提取简历信息

示例5：提取产品规格

示例6：提取API信息

最佳实践

常见问题

相关文档

​场景介绍

​业务痛点

​解决方案

​架构设计

​环境准备

​Step 1：配置 Extract API

​Step 2：构建 LangChain Tools

​定义提取 Schema

​Tool 1: 提取发票信息

​Tool 2: 提取医疗票据信息

​Tool 3: 提取合同信息

​Tool 4: 提取简历信息

​Tool 5: 提取产品规格

​Tool 6: 提取 API 信息

​Tool 7: 数据格式化

​组装所有Tools

​Step 3：配置 LangChain Agent

​Step 4：完整示例代码

​使用示例

​示例1：提取发票信息

​示例2：提取医疗票据信息

​示例3：提取合同信息

​示例4：提取简历信息

​示例5：提取产品规格

​示例6：提取API信息

​最佳实践

​常见问题

​相关文档

场景介绍

业务痛点

解决方案

架构设计

环境准备

Step 1：配置 Extract API

Step 2：构建 LangChain Tools

定义提取 Schema

Tool 1: 提取发票信息

Tool 2: 提取医疗票据信息

Tool 3: 提取合同信息

Tool 4: 提取简历信息

Tool 5: 提取产品规格

Tool 6: 提取 API 信息

Tool 7: 数据格式化

组装所有Tools

Step 3：配置 LangChain Agent

Step 4：完整示例代码

使用示例

示例1：提取发票信息

示例2：提取医疗票据信息

示例3：提取合同信息

示例4：提取简历信息

示例5：提取产品规格

示例6：提取API信息

最佳实践

常见问题

相关文档