## Doctran: extract properties

We can extract useful features of documents using the [Doctran](https://github.com/psychic-api/doctran) library, which uses OpenAI’s function calling feature to extract specific metadata.

Extracting metadata from documents is helpful for a variety of tasks, including:

*   **Classification:** classifying documents into different categories
*   **Data mining:** Extract structured data that can be used for data analysis
*   **Style transfer:** Change the way text is written to more closely match expected user input, improving vector search results

```
%pip install --upgrade --quiet  doctran
```

```
import jsonfrom langchain_community.document_transformers import DoctranPropertyExtractorfrom langchain_core.documents import Document
```

```
from dotenv import load_dotenvload_dotenv()
```

## Input[​](#input "Direct link to Input")

This is the document we’ll extract properties from.

```
sample_text = """[Generated with ChatGPT]Confidential Document - For Internal Use OnlyDate: July 1, 2023Subject: Updates and Discussions on Various TopicsDear Team,I hope this email finds you well. In this document, I would like to provide you with some important updates and discuss various topics that require our attention. Please treat the information contained herein as highly confidential.Security and Privacy MeasuresAs part of our ongoing commitment to ensure the security and privacy of our customers' data, we have implemented robust measures across all our systems. We would like to commend John Doe (email: john.doe@example.com) from the IT department for his diligent work in enhancing our network security. Moving forward, we kindly remind everyone to strictly adhere to our data protection policies and guidelines. Additionally, if you come across any potential security risks or incidents, please report them immediately to our dedicated team at security@example.com.HR Updates and Employee BenefitsRecently, we welcomed several new team members who have made significant contributions to their respective departments. I would like to recognize Jane Smith (SSN: 049-45-5928) for her outstanding performance in customer service. Jane has consistently received positive feedback from our clients. Furthermore, please remember that the open enrollment period for our employee benefits program is fast approaching. Should you have any questions or require assistance, please contact our HR representative, Michael Johnson (phone: 418-492-3850, email: michael.johnson@example.com).Marketing Initiatives and CampaignsOur marketing team has been actively working on developing new strategies to increase brand awareness and drive customer engagement. We would like to thank Sarah Thompson (phone: 415-555-1234) for her exceptional efforts in managing our social media platforms. Sarah has successfully increased our follower base by 20% in the past month alone. Moreover, please mark your calendars for the upcoming product launch event on July 15th. We encourage all team members to attend and support this exciting milestone for our company.Research and Development ProjectsIn our pursuit of innovation, our research and development department has been working tirelessly on various projects. I would like to acknowledge the exceptional work of David Rodriguez (email: david.rodriguez@example.com) in his role as project lead. David's contributions to the development of our cutting-edge technology have been instrumental. Furthermore, we would like to remind everyone to share their ideas and suggestions for potential new projects during our monthly R&D brainstorming session, scheduled for July 10th.Please treat the information in this document with utmost confidentiality and ensure that it is not shared with unauthorized individuals. If you have any questions or concerns regarding the topics discussed, please do not hesitate to reach out to me directly.Thank you for your attention, and let's continue to work together to achieve our goals.Best regards,Jason FanCofounder & CEOPsychicjason@psychic.dev"""print(sample_text)
```

```
[Generated with ChatGPT]Confidential Document - For Internal Use OnlyDate: July 1, 2023Subject: Updates and Discussions on Various TopicsDear Team,I hope this email finds you well. In this document, I would like to provide you with some important updates and discuss various topics that require our attention. Please treat the information contained herein as highly confidential.Security and Privacy MeasuresAs part of our ongoing commitment to ensure the security and privacy of our customers' data, we have implemented robust measures across all our systems. We would like to commend John Doe (email: john.doe@example.com) from the IT department for his diligent work in enhancing our network security. Moving forward, we kindly remind everyone to strictly adhere to our data protection policies and guidelines. Additionally, if you come across any potential security risks or incidents, please report them immediately to our dedicated team at security@example.com.HR Updates and Employee BenefitsRecently, we welcomed several new team members who have made significant contributions to their respective departments. I would like to recognize Jane Smith (SSN: 049-45-5928) for her outstanding performance in customer service. Jane has consistently received positive feedback from our clients. Furthermore, please remember that the open enrollment period for our employee benefits program is fast approaching. Should you have any questions or require assistance, please contact our HR representative, Michael Johnson (phone: 418-492-3850, email: michael.johnson@example.com).Marketing Initiatives and CampaignsOur marketing team has been actively working on developing new strategies to increase brand awareness and drive customer engagement. We would like to thank Sarah Thompson (phone: 415-555-1234) for her exceptional efforts in managing our social media platforms. Sarah has successfully increased our follower base by 20% in the past month alone. Moreover, please mark your calendars for the upcoming product launch event on July 15th. We encourage all team members to attend and support this exciting milestone for our company.Research and Development ProjectsIn our pursuit of innovation, our research and development department has been working tirelessly on various projects. I would like to acknowledge the exceptional work of David Rodriguez (email: david.rodriguez@example.com) in his role as project lead. David's contributions to the development of our cutting-edge technology have been instrumental. Furthermore, we would like to remind everyone to share their ideas and suggestions for potential new projects during our monthly R&D brainstorming session, scheduled for July 10th.Please treat the information in this document with utmost confidentiality and ensure that it is not shared with unauthorized individuals. If you have any questions or concerns regarding the topics discussed, please do not hesitate to reach out to me directly.Thank you for your attention, and let's continue to work together to achieve our goals.Best regards,Jason FanCofounder & CEOPsychicjason@psychic.dev
```

```
documents = [Document(page_content=sample_text)]properties = [    {        "name": "category",        "description": "What type of email this is.",        "type": "string",        "enum": ["update", "action_item", "customer_feedback", "announcement", "other"],        "required": True,    },    {        "name": "mentions",        "description": "A list of all people mentioned in this email.",        "type": "array",        "items": {            "name": "full_name",            "description": "The full name of the person mentioned.",            "type": "string",        },        "required": True,    },    {        "name": "eli5",        "description": "Explain this email to me like I'm 5 years old.",        "type": "string",        "required": True,    },]property_extractor = DoctranPropertyExtractor(properties=properties)
```

## Output[​](#output "Direct link to Output")

After extracting properties from a document, the result will be returned as a new document with properties provided in the metadata

```
extracted_document = property_extractor.transform_documents(    documents, properties=properties)
```

```
print(json.dumps(extracted_document[0].metadata, indent=2))
```

```
{  "extracted_properties": {    "category": "update",    "mentions": [      "John Doe",      "Jane Smith",      "Michael Johnson",      "Sarah Thompson",      "David Rodriguez"    ],    "eli5": "This email provides important updates and discussions on various topics. It mentions the implementation of security and privacy measures, HR updates and employee benefits, marketing initiatives and campaigns, and research and development projects. It recognizes the contributions of John Doe, Jane Smith, Michael Johnson, Sarah Thompson, and David Rodriguez. It also reminds everyone to adhere to data protection policies, enroll in the employee benefits program, attend the upcoming product launch event, and share ideas for new projects during the R&D brainstorming session."  }}
```