> For the complete documentation index, see [llms.txt](https://elishai.gitbook.io/retinal-stimulation-modeling-environment/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://elishai.gitbook.io/retinal-stimulation-modeling-environment/model-specification/meta-parameters.md).

# Meta-parameters

This is a meta-parameters specification, in which a simulation description can be given, simulation duration is specified, and references to four other XML files are given. 

In the following meta-parameters XML file, we defined a 1.5-second simulation and provide references to four other model specification XML files, described next.

```
<simulation_parameters xmlns="RSME">

  <simulation_description> single_SAC  </simulation_description>
  <simulation_duration>    1500        </simulation_duration>

  <visual_stimulation> single_SAC_visual_expanding.xml  </visual_stimulation>
  <network>            single_SAC_network.xml           </network>
  <morphology>         single_SAC_morphology.xml        </morphology>
  <biophysics>         single_SAC_biophysics.xml        </biophysics>

</simulation_parameters>

```

In the following chapters, the four specification files will be described.