diff --git a/.gitignore b/.gitignore
index a8af57d..2122691 100644
--- a/.gitignore
+++ b/.gitignore
@@ -458,3 +458,4 @@ logs/
 
 S.gpg-agent*
 .vscode/settings.json
+examples/example1/assets
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index bb3084c..69878d8 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -48,5 +48,10 @@ repos:
     hooks:
       - id: mypy
         additional_dependencies: [types-PyYAML==6.0.12.11, "types-requests"]
-        args: ["--check-untyped-defs", "--ignore-missing-imports"]
+        args:
+          [
+            "--check-untyped-defs",
+            "--ignore-missing-imports",
+            "--new-type-inference",
+          ]
         exclude: "^templates/"
diff --git a/knowledgehub/composite/__init__.py b/knowledgehub/composite/__init__.py
new file mode 100644
index 0000000..fac7d70
--- /dev/null
+++ b/knowledgehub/composite/__init__.py
@@ -0,0 +1,9 @@
+from .branching import GatedBranchingPipeline, SimpleBranchingPipeline
+from .linear import GatedLinearPipeline, SimpleLinearPipeline
+
+__all__ = [
+    "SimpleLinearPipeline",
+    "GatedLinearPipeline",
+    "SimpleBranchingPipeline",
+    "GatedBranchingPipeline",
+]
diff --git a/knowledgehub/composite/branching.py b/knowledgehub/composite/branching.py
new file mode 100644
index 0000000..fb0b192
--- /dev/null
+++ b/knowledgehub/composite/branching.py
@@ -0,0 +1,182 @@
+from typing import List, Optional
+
+from theflow import Param
+
+from kotaemon.base import BaseComponent
+from kotaemon.composite.linear import GatedLinearPipeline
+from kotaemon.documents.base import Document
+
+
+class SimpleBranchingPipeline(BaseComponent):
+    """
+    A simple branching pipeline for executing multiple branches.
+
+    Attributes:
+        branches (List[BaseComponent]): The list of branches to be executed.
+
+    Example Usage:
+        from kotaemon.composite import GatedLinearPipeline
+        from kotaemon.llms.chats.openai import AzureChatOpenAI
+        from kotaemon.post_processing.extractor import RegexExtractor
+        from kotaemon.prompt.base import BasePromptComponent
+
+        def identity(x):
+            return x
+
+        pipeline = SimpleBranchingPipeline()
+        llm = AzureChatOpenAI(
+            openai_api_base="your openai api base",
+            openai_api_key="your openai api key",
+            openai_api_version="your openai api version",
+            deployment_name="dummy-q2-gpt35",
+            temperature=0,
+            request_timeout=600,
+        )
+
+        for i in range(3):
+            pipeline.add_branch(
+                GatedLinearPipeline(
+                    prompt=BasePromptComponent(template=f"what is {i} in Japanese ?"),
+                    condition=RegexExtractor(pattern=f"{i}"),
+                    llm=llm,
+                    post_processor=identity,
+                )
+            )
+        print(pipeline(condition_text="1"))
+        print(pipeline(condition_text="2"))
+        print(pipeline(condition_text="12"))
+    """
+
+    branches: List[BaseComponent] = Param(default_callback=lambda *_: [])
+
+    def add_branch(self, component: BaseComponent):
+        """
+        Add a new branch to the pipeline.
+
+        Args:
+            component (BaseComponent): The branch component to be added.
+        """
+        self.branches.append(component)
+
+    def run(self, **prompt_kwargs):
+        """
+        Execute the pipeline by running each branch and return the outputs as a list.
+
+        Args:
+            **prompt_kwargs: Keyword arguments for the branches.
+
+        Returns:
+            List: The outputs of each branch as a list.
+        """
+        output = []
+        for i, branch in enumerate(self.branches):
+            self._prepare_child(branch, name=f"branch-{i}")
+            output.append(branch(**prompt_kwargs))
+
+        return output
+
+
+class GatedBranchingPipeline(SimpleBranchingPipeline):
+    """
+    A simple gated branching pipeline for executing multiple branches based on a
+        condition.
+
+    This class extends the SimpleBranchingPipeline class and adds the ability to execute
+        the branches until a branch returns a non-empty output based on a condition.
+
+    Attributes:
+        branches (List[BaseComponent]): The list of branches to be executed.
+
+    Example Usage:
+        from kotaemon.composite import GatedLinearPipeline
+        from kotaemon.llms.chats.openai import AzureChatOpenAI
+        from kotaemon.post_processing.extractor import RegexExtractor
+        from kotaemon.prompt.base import BasePromptComponent
+
+        def identity(x):
+            return x
+
+        pipeline = GatedBranchingPipeline()
+        llm = AzureChatOpenAI(
+            openai_api_base="your openai api base",
+            openai_api_key="your openai api key",
+            openai_api_version="your openai api version",
+            deployment_name="dummy-q2-gpt35",
+            temperature=0,
+            request_timeout=600,
+        )
+
+        for i in range(3):
+            pipeline.add_branch(
+                GatedLinearPipeline(
+                    prompt=BasePromptComponent(template=f"what is {i} in Japanese ?"),
+                    condition=RegexExtractor(pattern=f"{i}"),
+                    llm=llm,
+                    post_processor=identity,
+                )
+            )
+        print(pipeline(condition_text="1"))
+        print(pipeline(condition_text="2"))
+    """
+
+    def run(self, *, condition_text: Optional[str] = None, **prompt_kwargs):
+        """
+        Execute the pipeline by running each branch and return the output of the first
+            branch that returns a non-empty output based on the provided condition.
+
+        Args:
+            condition_text (str): The condition text to evaluate for each branch.
+                Default to None.
+            **prompt_kwargs: Keyword arguments for the branches.
+
+        Returns:
+            Union[OutputType, None]: The output of the first branch that satisfies the
+            condition, or None if no branch satisfies the condition.
+
+        Raise:
+            ValueError: If condition_text is None
+        """
+        if condition_text is None:
+            raise ValueError("`condition_text` must be provided.")
+
+        for i, branch in enumerate(self.branches):
+            self._prepare_child(branch, name=f"branch-{i}")
+            output = branch(condition_text=condition_text, **prompt_kwargs)
+            if output:
+                return output
+
+        return Document(None)
+
+
+if __name__ == "__main__":
+    import dotenv
+
+    from kotaemon.llms.chats.openai import AzureChatOpenAI
+    from kotaemon.post_processing.extractor import RegexExtractor
+    from kotaemon.prompt.base import BasePromptComponent
+
+    def identity(x):
+        return x
+
+    secrets = dotenv.dotenv_values(".env")
+
+    pipeline = GatedBranchingPipeline()
+    llm = AzureChatOpenAI(
+        openai_api_base=secrets.get("OPENAI_API_BASE", ""),
+        openai_api_key=secrets.get("OPENAI_API_KEY", ""),
+        openai_api_version=secrets.get("OPENAI_API_VERSION", ""),
+        deployment_name="dummy-q2-gpt35",
+        temperature=0,
+        request_timeout=600,
+    )
+
+    for i in range(3):
+        pipeline.add_branch(
+            GatedLinearPipeline(
+                prompt=BasePromptComponent(template=f"what is {i} in Japanese ?"),
+                condition=RegexExtractor(pattern=f"{i}"),
+                llm=llm,
+                post_processor=identity,
+            )
+        )
+    pipeline(condition_text="1")
diff --git a/knowledgehub/composite/linear.py b/knowledgehub/composite/linear.py
new file mode 100644
index 0000000..288ba62
--- /dev/null
+++ b/knowledgehub/composite/linear.py
@@ -0,0 +1,153 @@
+from typing import Any, Callable, Optional, Union
+
+from kotaemon.base import BaseComponent
+from kotaemon.documents.base import Document, IO_Type
+from kotaemon.llms.chats.base import ChatLLM
+from kotaemon.llms.completions.base import LLM
+from kotaemon.prompt.base import BasePromptComponent
+
+
+class SimpleLinearPipeline(BaseComponent):
+    """
+    A simple pipeline for running a function with a prompt, a language model, and an
+        optional post-processor.
+
+    Attributes:
+        prompt (BasePromptComponent): The prompt component used to generate the initial
+            input.
+        llm (Union[ChatLLM, LLM]): The language model component used to generate the
+            output.
+        post_processor (Union[BaseComponent, Callable[[IO_Type], IO_Type]]): An optional
+            post-processor component or function.
+
+    Example Usage:
+        from kotaemon.llms.chats.openai import AzureChatOpenAI
+        from kotaemon.prompt.base import BasePromptComponent
+
+        def identity(x):
+            return x
+
+        llm = AzureChatOpenAI(
+            openai_api_base="your openai api base",
+            openai_api_key="your openai api key",
+            openai_api_version="your openai api version",
+            deployment_name="dummy-q2-gpt35",
+            temperature=0,
+            request_timeout=600,
+        )
+
+        pipeline = SimpleLinearPipeline(
+            prompt=BasePromptComponent(template="what is {word} in Japanese ?"),
+            llm=llm,
+            post_processor=identity,
+        )
+        print(pipeline(word="lone"))
+    """
+
+    prompt: BasePromptComponent
+    llm: Union[ChatLLM, LLM]
+    post_processor: Union[BaseComponent, Callable[[IO_Type], IO_Type]]
+
+    def run(
+        self,
+        *,
+        llm_kwargs: Optional[dict] = {},
+        post_processor_kwargs: Optional[dict] = {},
+        **prompt_kwargs,
+    ):
+        """
+        Run the function with the given arguments and return the final output as a
+            Document object.
+
+        Args:
+            llm_kwargs (dict): Keyword arguments for the llm call.
+            post_processor_kwargs (dict): Keyword arguments for the post_processor.
+            **prompt_kwargs: Keyword arguments for populating the prompt.
+
+        Returns:
+            Document: The final output of the function as a Document object.
+        """
+        prompt = self.prompt(**prompt_kwargs)
+        llm_output = self.llm(prompt.text, **llm_kwargs)
+        if self.post_processor is not None:
+            final_output = self.post_processor(llm_output, **post_processor_kwargs)
+        else:
+            final_output = llm_output
+
+        return Document(final_output)
+
+
+class GatedLinearPipeline(SimpleLinearPipeline):
+    """
+    A pipeline that extends the SimpleLinearPipeline class and adds a condition
+        attribute.
+
+    Attributes:
+        condition (Callable[[IO_Type], Any]): A callable function that represents the
+            condition.
+
+    Example Usage:
+        from kotaemon.llms.chats.openai import AzureChatOpenAI
+        from kotaemon.post_processing.extractor import RegexExtractor
+        from kotaemon.prompt.base import BasePromptComponent
+
+        def identity(x):
+            return x
+
+        llm = AzureChatOpenAI(
+            openai_api_base="your openai api base",
+            openai_api_key="your openai api key",
+            openai_api_version="your openai api version",
+            deployment_name="dummy-q2-gpt35",
+            temperature=0,
+            request_timeout=600,
+        )
+
+        pipeline = GatedLinearPipeline(
+            prompt=BasePromptComponent(template="what is {word} in Japanese ?"),
+            condition=RegexExtractor(pattern="some pattern"),
+            llm=llm,
+            post_processor=identity,
+        )
+        print(pipeline(condition_text="some pattern", word="lone"))
+        print(pipeline(condition_text="other pattern", word="lone"))
+    """
+
+    condition: Callable[[IO_Type], Any]
+
+    def run(
+        self,
+        *,
+        condition_text: Optional[str] = None,
+        llm_kwargs: Optional[dict] = {},
+        post_processor_kwargs: Optional[dict] = {},
+        **prompt_kwargs,
+    ) -> Document:
+        """
+        Run the pipeline with the given arguments and return the final output as a
+            Document object.
+
+        Args:
+            condition_text (str): The condition text to evaluate. Default to None.
+            llm_kwargs (dict): Additional keyword arguments for the language model call.
+            post_processor_kwargs (dict): Additional keyword arguments for the
+                post-processor.
+            **prompt_kwargs: Keyword arguments for populating the prompt.
+
+        Returns:
+            Document: The final output of the pipeline as a Document object.
+
+        Raises:
+            ValueError: If condition_text is None
+        """
+        if condition_text is None:
+            raise ValueError("`condition_text` must be provided")
+
+        if self.condition(condition_text):
+            return super().run(
+                llm_kwargs=llm_kwargs,
+                post_processor_kwargs=post_processor_kwargs,
+                **prompt_kwargs,
+            )
+
+        return Document(None)
diff --git a/knowledgehub/documents/base.py b/knowledgehub/documents/base.py
index 579031b..7044a12 100644
--- a/knowledgehub/documents/base.py
+++ b/knowledgehub/documents/base.py
@@ -1,12 +1,43 @@
+from typing import Any, Optional
+
 from haystack.schema import Document as HaystackDocument
 from llama_index.bridge.pydantic import Field
 from llama_index.schema import Document as BaseDocument
+from pyparsing import TypeVar
 
+IO_Type = TypeVar("IO_Type", "Document", str)
 SAMPLE_TEXT = "A sample Document from kotaemon"
 
 
 class Document(BaseDocument):
-    """Base document class, mostly inherited from Document class from llama-index"""
+    """
+    Base document class, mostly inherited from Document class from llama-index.
+
+    This class accept one positional argument `content` of an arbitrary type, which will
+        store the raw content of the document. If specified, the class will use
+        `content` to initialize the base llama_index class.
+    """
+
+    content: Any
+
+    def __init__(self, content: Optional[Any] = None, *args, **kwargs):
+        if content is None:
+            if kwargs.get("text", None) is not None:
+                kwargs["content"] = kwargs["text"]
+            elif kwargs.get("embedding", None) is not None:
+                kwargs["content"] = kwargs["embedding"]
+        elif isinstance(content, Document):
+            kwargs = content.dict()
+        else:
+            kwargs["content"] = content
+            if content:
+                kwargs["text"] = str(content)
+            else:
+                kwargs["text"] = ""
+        super().__init__(*args, **kwargs)
+
+    def __bool__(self):
+        return bool(self.content)
 
     @classmethod
     def example(cls) -> "Document":
@@ -23,7 +54,7 @@ class Document(BaseDocument):
         return HaystackDocument(content=text, meta=metadata)
 
     def __str__(self):
-        return self.text
+        return str(self.content)
 
 
 class RetrievedDocument(Document):
diff --git a/knowledgehub/post_processing/extractor.py b/knowledgehub/post_processing/extractor.py
index c60077a..ee5633b 100644
--- a/knowledgehub/post_processing/extractor.py
+++ b/knowledgehub/post_processing/extractor.py
@@ -1,22 +1,42 @@
 import re
-from typing import Dict, List
+from typing import Callable, Dict, List, Union
+
+from theflow import Param
 
 from kotaemon.base import BaseComponent
 from kotaemon.documents.base import Document
 
 
+class ExtractorOutput(Document):
+    """
+    Represents the output of an extractor.
+    """
+
+    matches: List[str]
+
+
 class RegexExtractor(BaseComponent):
     """
     Simple class for extracting text from a document using a regex pattern.
 
     Args:
-        pattern (str): The regex pattern to use.
+        pattern (List[str]): The regex pattern(s) to use.
         output_map (dict, optional): A mapping from extracted text to the
             desired output. Defaults to None.
     """
 
-    pattern: str
-    output_map: Dict[str, str] = {}
+    class Config:
+        middleware_switches = {"theflow.middleware.CachingMiddleware": False}
+
+    pattern: List[str]
+    output_map: Union[Dict[str, str], Callable[[str], str]] = Param(
+        default_callback=lambda *_: {}
+    )
+
+    def __init__(self, pattern: Union[str, List[str]], **kwargs):
+        if isinstance(pattern, str):
+            pattern = [pattern]
+        super().__init__(pattern=pattern, **kwargs)
 
     @staticmethod
     def run_raw_static(pattern: str, text: str) -> List[str]:
@@ -50,28 +70,34 @@ class RegexExtractor(BaseComponent):
         if not output_map:
             return text
 
-        return str(output_map.get(text, text))
+        if isinstance(output_map, dict):
+            return output_map.get(text, text)
 
-    def run_raw(self, text: str) -> List[Document]:
+        return output_map(text)
+
+    def run_raw(self, text: str) -> ExtractorOutput:
         """
-        Runs the raw text through the static pattern and output mapping, returning a
-            list of strings.
+        Matches the raw text against the pattern and rans the output mapping, returning
+            an instance of ExtractorOutput.
 
         Args:
             text (str): The raw text to be processed.
 
         Returns:
-            List[str]: The processed output as a list of strings.
+            ExtractorOutput: The processed output as a list of ExtractorOutput.
         """
-        output = self.run_raw_static(self.pattern, text)
+        output = sum(
+            [self.run_raw_static(p, text) for p in self.pattern], []
+        )  # type: List[str]
         output = [self.map_output(text, self.output_map) for text in output]
 
-        return [
-            Document(text=text, metadata={"origin": "RegexExtractor"})
-            for text in output
-        ]
+        return ExtractorOutput(
+            text=output[0] if output else "",
+            matches=output,
+            metadata={"origin": "RegexExtractor"},
+        )
 
-    def run_batch_raw(self, text_batch: List[str]) -> List[List[Document]]:
+    def run_batch_raw(self, text_batch: List[str]) -> List[ExtractorOutput]:
         """
         Runs a batch of raw text inputs through the `run_raw()` method and returns the
             output for each input.
@@ -80,29 +106,28 @@ class RegexExtractor(BaseComponent):
             text_batch (List[str]): A list of raw text inputs to process.
 
         Returns:
-            List[List[str]]: A list of lists containing the output for each input in the
+            List[ExtractorOutput]: A list containing the output for each input in the
                 batch.
         """
         batch_output = [self.run_raw(each_text) for each_text in text_batch]
 
         return batch_output
 
-    def run_document(self, document: Document) -> List[Document]:
+    def run_document(self, document: Document) -> ExtractorOutput:
         """
-        Run the document through the regex extractor and return a list of extracted
-            documents.
+        Run the document through the regex extractor and return an extracted document.
 
         Args:
             document (Document): The input document.
 
         Returns:
-            List[Document]: A list of extracted documents.
+            ExtractorOutput: The extracted content.
         """
         return self.run_raw(document.text)
 
     def run_batch_document(
         self, document_batch: List[Document]
-    ) -> List[List[Document]]:
+    ) -> List[ExtractorOutput]:
         """
         Runs a batch of documents through the `run_document` function and returns the
             output for each document.
@@ -113,15 +138,15 @@ class RegexExtractor(BaseComponent):
                 batch of documents to process.
 
         Returns:
-            List[List[Document]]: A list of lists where each inner list contains the
-                output Document for each input Document in the batch.
+            List[ExtractorOutput]: A list  contains the output ExtractorOutput for each
+                input Document in the batch.
 
         Example:
             document1 = Document(...)
             document2 = Document(...)
             document_batch = [document1, document2]
             batch_output = self.run_batch_document(document_batch)
-            # batch_output will be [[output1_document1, ...], [output1_document2, ...]]
+            # batch_output will be [output1_document1, output1_document2]
         """
 
         batch_output = [
@@ -162,3 +187,22 @@ class RegexExtractor(BaseComponent):
             return True
 
         return False
+
+
+class FirstMatchRegexExtractor(RegexExtractor):
+    pattern: List[str]
+
+    def run_raw(self, text: str) -> ExtractorOutput:
+        for p in self.pattern:
+            output = self.run_raw_static(p, text)
+            if output:
+                output = [self.map_output(text, self.output_map) for text in output]
+                return ExtractorOutput(
+                    text=output[0],
+                    matches=output,
+                    metadata={"origin": "FirstMatchRegexExtractor"},
+                )
+
+        return ExtractorOutput(
+            text=None, matches=[], metadata={"origin": "FirstMatchRegexExtractor"}
+        )
diff --git a/knowledgehub/prompt/base.py b/knowledgehub/prompt/base.py
index caee3b0..48b370c 100644
--- a/knowledgehub/prompt/base.py
+++ b/knowledgehub/prompt/base.py
@@ -15,6 +15,9 @@ class BasePromptComponent(BaseComponent):
             given template.
     """
 
+    class Config:
+        middleware_switches = {"theflow.middleware.CachingMiddleware": False}
+
     def __init__(self, template: Union[str, PromptTemplate], **kwargs):
         super().__init__()
         self.template = (
diff --git a/tests/test_composite.py b/tests/test_composite.py
new file mode 100644
index 0000000..66f7e94
--- /dev/null
+++ b/tests/test_composite.py
@@ -0,0 +1,141 @@
+import pytest
+
+from kotaemon.composite import (
+    GatedBranchingPipeline,
+    GatedLinearPipeline,
+    SimpleBranchingPipeline,
+    SimpleLinearPipeline,
+)
+from kotaemon.llms.chats.openai import AzureChatOpenAI
+from kotaemon.post_processing.extractor import RegexExtractor
+from kotaemon.prompt.base import BasePromptComponent
+
+
+@pytest.fixture
+def mock_llm():
+    return AzureChatOpenAI(
+        openai_api_base="OPENAI_API_BASE",
+        openai_api_key="OPENAI_API_KEY",
+        openai_api_version="OPENAI_API_VERSION",
+        deployment_name="dummy-q2-gpt35",
+        temperature=0,
+        request_timeout=600,
+    )
+
+
+@pytest.fixture
+def mock_post_processor():
+    return RegexExtractor(pattern=r"\d+")
+
+
+@pytest.fixture
+def mock_prompt():
+    return BasePromptComponent(template="Test prompt {value}")
+
+
+@pytest.fixture
+def mock_simple_linear_pipeline(mock_prompt, mock_llm, mock_post_processor):
+    return SimpleLinearPipeline(
+        prompt=mock_prompt, llm=mock_llm, post_processor=mock_post_processor
+    )
+
+
+@pytest.fixture
+def mock_gated_linear_pipeline_positive(mock_prompt, mock_llm, mock_post_processor):
+    return GatedLinearPipeline(
+        prompt=mock_prompt,
+        llm=mock_llm,
+        post_processor=mock_post_processor,
+        condition=RegexExtractor(pattern="positive"),
+    )
+
+
+@pytest.fixture
+def mock_gated_linear_pipeline_negative(mock_prompt, mock_llm, mock_post_processor):
+    return GatedLinearPipeline(
+        prompt=mock_prompt,
+        llm=mock_llm,
+        post_processor=mock_post_processor,
+        condition=RegexExtractor(pattern="negative"),
+    )
+
+
+def test_simple_linear_pipeline_run(mocker, mock_simple_linear_pipeline):
+    openai_mocker = mocker.patch.object(
+        AzureChatOpenAI, "run", return_value="This is a test 123"
+    )
+
+    result = mock_simple_linear_pipeline.run(value="abc")
+
+    assert result.text == "123"
+    assert openai_mocker.call_count == 1
+
+
+def test_gated_linear_pipeline_run_positive(
+    mocker, mock_gated_linear_pipeline_positive
+):
+    openai_mocker = mocker.patch.object(
+        AzureChatOpenAI, "run", return_value="This is a test 123."
+    )
+
+    result = mock_gated_linear_pipeline_positive.run(
+        value="abc", condition_text="positive condition"
+    )
+
+    assert result.text == "123"
+    assert openai_mocker.call_count == 1
+
+
+def test_gated_linear_pipeline_run_negative(
+    mocker, mock_gated_linear_pipeline_positive
+):
+    openai_mocker = mocker.patch.object(
+        AzureChatOpenAI, "run", return_value="This is a test 123."
+    )
+
+    result = mock_gated_linear_pipeline_positive.run(
+        value="abc", condition_text="negative condition"
+    )
+
+    assert result.content is None
+    assert openai_mocker.call_count == 0
+
+
+def test_simple_branching_pipeline_run(mocker, mock_simple_linear_pipeline):
+    openai_mocker = mocker.patch.object(
+        AzureChatOpenAI,
+        "run",
+        side_effect=[
+            "This is a test 123.",
+            "a quick brown fox",
+            "jumps over the lazy dog 456",
+        ],
+    )
+    pipeline = SimpleBranchingPipeline()
+    for _ in range(3):
+        pipeline.add_branch(mock_simple_linear_pipeline)
+
+    result = pipeline.run(value="abc")
+    texts = [each.text for each in result]
+
+    assert len(result) == 3
+    assert texts == ["123", "", "456"]
+    assert openai_mocker.call_count == 3
+
+
+def test_simple_gated_branching_pipeline_run(
+    mocker, mock_gated_linear_pipeline_positive, mock_gated_linear_pipeline_negative
+):
+    openai_mocker = mocker.patch.object(
+        AzureChatOpenAI, "run", return_value="a quick brown fox"
+    )
+    pipeline = GatedBranchingPipeline()
+
+    pipeline.add_branch(mock_gated_linear_pipeline_negative)
+    pipeline.add_branch(mock_gated_linear_pipeline_positive)
+    pipeline.add_branch(mock_gated_linear_pipeline_positive)
+
+    result = pipeline.run(value="abc", condition_text="positive condition")
+
+    assert result.text == ""
+    assert openai_mocker.call_count == 2
diff --git a/tests/test_documents.py b/tests/test_documents.py
new file mode 100644
index 0000000..a76464d
--- /dev/null
+++ b/tests/test_documents.py
@@ -0,0 +1,49 @@
+from haystack.schema import Document as HaystackDocument
+
+from kotaemon.documents.base import Document, RetrievedDocument
+
+
+def test_document_constructor_with_builtin_types():
+    for value in ["str", 1, {}, set(), [], tuple, None]:
+        doc = Document(value)
+        assert doc.text == (str(value) if value else "")
+        assert doc.content == value
+        assert bool(doc) == bool(value)
+
+
+def test_document_constructor_with_document():
+    text = "Sample text"
+    doc1 = Document(text)
+    doc2 = Document(doc1)
+    assert doc2.text == doc1.text
+    assert doc2.content == doc1.content
+
+
+def test_document_to_haystack_format():
+    text = "Sample text"
+    metadata = {"filename": "sample.txt"}
+    doc = Document(text, metadata=metadata)
+    haystack_doc = doc.to_haystack_format()
+    assert isinstance(haystack_doc, HaystackDocument)
+    assert haystack_doc.content == doc.text
+    assert haystack_doc.meta == metadata
+
+
+def test_retrieved_document_default_values():
+    sample_text = "text"
+    retrieved_doc = RetrievedDocument(text=sample_text)
+    assert retrieved_doc.text == sample_text
+    assert retrieved_doc.score == 0.0
+    assert retrieved_doc.retrieval_metadata == {}
+
+
+def test_retrieved_document_attributes():
+    sample_text = "text"
+    score = 0.8
+    metadata = {"source": "retrieval_system"}
+    retrieved_doc = RetrievedDocument(
+        text=sample_text, score=score, retrieval_metadata=metadata
+    )
+    assert retrieved_doc.text == sample_text
+    assert retrieved_doc.score == score
+    assert retrieved_doc.retrieval_metadata == metadata
diff --git a/tests/test_post_processing.py b/tests/test_post_processing.py
index bd27ad7..aefa128 100644
--- a/tests/test_post_processing.py
+++ b/tests/test_post_processing.py
@@ -14,8 +14,8 @@ def regex_extractor():
 def test_run_document(regex_extractor):
     document = Document(text="This is a test. 1 2 3")
     extracted_document = regex_extractor(document)
-    extracted_texts = [each.text for each in extracted_document]
-    assert extracted_texts == ["One", "Two", "Three"]
+    assert extracted_document.text == "One"
+    assert extracted_document.matches == ["One", "Two", "Three"]
 
 
 def test_is_document(regex_extractor):
@@ -30,11 +30,13 @@ def test_is_batch(regex_extractor):
 
 def test_run_raw(regex_extractor):
     output = regex_extractor("This is a test. 123")
-    output = [each.text for each in output]
-    assert output == ["123"]
+    assert output.text == "123"
+    assert output.matches == ["123"]
 
 
 def test_run_batch_raw(regex_extractor):
     output = regex_extractor(["This is a test. 123", "456"])
-    output = [[each.text for each in batch] for batch in output]
-    assert output == [["123"], ["456"]]
+    extracted_text = [each.text for each in output]
+    extracted_matches = [each.matches for each in output]
+    assert extracted_text == ["123", "456"]
+    assert extracted_matches == [["123"], ["456"]]
diff --git a/tests/test_prompt.py b/tests/test_prompt.py
index f71d5fe..51c5154 100644
--- a/tests/test_prompt.py
+++ b/tests/test_prompt.py
@@ -54,10 +54,7 @@ def test_run():
 
     result = prompt()
 
-    assert (
-        result.text
-        == "str = Alice, int = 30, doc = Helloo, Alice!, comp = ['One', 'Two', 'Three']"
-    )
+    assert result.text == "str = Alice, int = 30, doc = Helloo, Alice!, comp = One"
 
 
 def test_set_method():