DITA (Darwin Information Typing Architecture) is instrumental in enabling the integration of content from various sources and systems in healthcare documentation, offering a structured framework that streamlines the inclusion of diverse information. This integration is vital in healthcare, where documents often require content from multiple contributors, databases, or external systems.

1. Content Aggregation: DITA allows content authors to aggregate information from various sources seamlessly. For example, in healthcare documentation, you might need to integrate patient data from an electronic health record (EHR) system. With DITA, you can define elements to extract and display this data within your documents.

<ehr_data>
  <patient_name>John Doe</patient_name>
  <diagnosis>Cardiovascular Disease</diagnosis>
</ehr_data>

2. Cross-Referencing: DITA supports cross-referencing, enabling the linking of content from different sources. In healthcare, you may want to reference a specific section of a medical guideline within your documentation. DITA enables you to create these references, ensuring that your readers can easily access the external content.

<xref href="medical_guideline.dita">Cardiovascular Disease Guidelines</xref>

3. Data Transformation: DITA allows for data transformation and mapping. If you receive data in a specific format that needs to be presented differently in your healthcare documents, DITA provides the tools to transform and map the data accordingly.

<data_map>
  <from>EHR Data</from>
  <to>Document Data</to>
  <mapping>
    <ehr_element>diagnosis</ehr_element>
    <document_element>condition</document_element>
  </mapping>
</data_map>

In summary, DITA empowers healthcare documentation by allowing the integration of content from various sources and systems. It facilitates content aggregation, cross-referencing, and data transformation, ensuring that healthcare documents are comprehensive and able to leverage information from diverse origins.