.. sidebar::

    .. list-table:: **Ontology Card**
       :header-rows: 0

       * - **Domain**
         - Chemistry
       * - **Category**
         - Chemicals, Properties
       * - **Current Version**
         - 2020-04-13
       * - **Last Updated**
         - 2020-04-13
       * - **Creator**
         - None
       * - **License**
         - None
       * - **Format**
         - owl
       * - **Download**
         - `Download FIX Ontology (FIX) <https://terminology.tib.eu/ts/ontologies/FIX>`_

FIX Ontology (FIX)
========================================================================================================

The FIX (Physico-Chemical Methods and Properties) Ontology provides a systematic vocabulary for describing and classifying physico-chemical methods and their associated properties. It represents analytical and experimental techniques used in chemistry and materials science, including measurement methods, analytical procedures, and the physical and chemical properties they determine. The ontology captures relationships between methods and properties, enabling precise description of experimental workflows and results in laboratory and industrial settings. It supports semantic interoperability in chemistry databases, laboratory information systems (LIMS), and scientific data repositories.

**Example Usage**: Represent a mass spectrometry measurement as an instance of FIX:AnalyticalMethod linked to FIX:ChemicalProperty instances such as molecular weight or compound identification.

Metrics & Statistics
--------------------------

.. tab:: Graph


    .. list-table:: Graph Statistics
        :widths: 50 50
        :header-rows: 0

        * - **Total Nodes**
          - 3402
        * - **Total Edges**
          - 7621
        * - **Root Nodes**
          - 22
        * - **Leaf Nodes**
          - 2147
    ::


.. tab:: Coverage


    .. list-table:: Knowledge Coverage Statistics
        :widths: 50 50
        :header-rows: 0

        * - **Classes**
          - 1163
        * - **Individuals**
          - 0
        * - **Properties**
          - 5

    ::

.. tab:: Hierarchy


    .. list-table:: Hierarchical Metrics
        :widths: 50 50
        :header-rows: 0

        * - **Maximum Depth**
          - 7
        * - **Minimum Depth**
          - 0
        * - **Average Depth**
          - 2.46
        * - **Depth Variance**
          - 2.32
    ::


.. tab:: Breadth


    .. list-table:: Breadth Metrics
        :widths: 50 50
        :header-rows: 0

        * - **Maximum Breadth**
          - 75
        * - **Minimum Breadth**
          - 2
        * - **Average Breadth**
          - 36.25
        * - **Breadth Variance**
          - 666.69
    ::

.. tab:: LLMs4OL


    .. list-table:: LLMs4OL Dataset Statistics
        :widths: 50 50
        :header-rows: 0

        * - **Term Types**
          - 0
        * - **Taxonomic Relations**
          - 2751
        * - **Non-taxonomic Relations**
          - 0
        * - **Average Terms per Type**
          - 0.00
    ::

Usage Example
----------------
Use the following code to import this ontology programmatically:

.. code-block:: python

    from ontolearner.ontology import FIX

    ontology = FIX()
    ontology.load("path/to/FIX-ontology.owl")

    # Extract datasets
    data = ontology.extract()

    # Access specific relations
    term_types = data.term_typings
    taxonomic_relations = data.type_taxonomies
    non_taxonomic_relations = data.type_non_taxonomic_relations