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 Subsection 3.1.1: Format Specification Versions Up Section 3.1: Free Format Overview Subsection 3.1.3: Multiple Input Files 

3.1.2Notes on backward compatibility

Some features that were available in versions prior to 3.0 are no longer supported or require a different syntax.
  1. The Parameters section is no longer supported. This section allowed users to define file parameters that could be used as parameter values. This section was removed since it was difficult to support in FEBio Studio and a better mechanism was implemented for defining model-level parameters. (See the Globals section.)
  2. Some fiber materials defined the theta and phi parameters for setting the fiber orientation. These parameters are no longer supported. Instead, the fiber direction should be specified via the fiber property, or if the fiber property is not available, the mat_axis property.
    <fiber type="angles">
      <theta>90</theta>
      <phi>0</phi>
    </fiber>
    
 Subsection 3.1.1: Format Specification Versions Up Section 3.1: Free Format Overview Subsection 3.1.3: Multiple Input Files