started a section on Data Cleaning by porting over the code from the notebook

lia/nfdi-emacs-lia-workshop.lia.md

@@ -178,6 +178,99 @@ the letter "Q" followed by a series of numbers...
 | Q1205424   | NFDI4Objects |
 | Q17575706  | NFDI4Objects |
 
+## Switching Languages
+
+One of the neat things about org-babel is that we can pass seemlessly pass data between languages.
+
+You may recall from the cell that contained our SPARQ query this bit: `:exports both`. This ensures
+that both the code and the results of that cell are present when the file is exported. For our
+specific purpose here, that means that other cells can use the output of this cell as input.
+
+We can specifically ask for the results of a previous cell by referencing the name of that cell.
+Our SPARQL cell had the line `#+NAME: raw-dataset`, which means we can ask for the result of this
+cell by referencing this name as a variable. Let's look at how to do that in the next section.
+
+## Passing Data Between Cells
+
+We'll look at the orb-babel cell first, then at a closer look at the shell command.
+
+```
+#+CAPTION: Cleaning the raw data.
+#+NAME: clean-dataset
+#+BEGIN_SRC sh -n :var input=raw-dataset :colnames yes :exports both
+echo "$input" | sed -E '/Q[0-9]+/d'
+#+END_SRC
+```
+
+## sed and Regex
+
+As a brief explination of the code, we are taking the result of the `raw-dataset` cell, and
+assigning that value to the variable "$input". We are then echoing that input, but filtering it
+using `sed`, A Unix utility that can be used for parsing and transforming text.
+
+The `-E` switch is telling sed that we are going to use an extended regex expression.
+
+The pattern `'/Q[0-9]+/d'` has a few different components:
+
+- `/` marks the start of the pattern
+- `Q[0-9]+` is a regex pattern that says "match lines that contain a ! followed by one or more
+digits
+- `/d` is a sed command that deletes the current pattern space, which in the context of $input
+will be the entire line
+
+## Viewing our Results
+
+```
+| wLabel                                                       | pLabel            |
+|--------------------------------------------------------------+-------------------|
+| Academy of Sciences and Humanities in Hamburg                | Text+             |
+| Academy of Sciences and Literature Mainz                     | NFDI4Culture      |
+| Academy of Sciences and Literature Mainz                     | NFDI4Memory       |
+| Academy of Sciences and Literature Mainz                     | NFDI4Objects      |
+| Academy of Sciences and Literature Mainz                     | Text+             |
+| Alfred Wegener Institute for Polar and Marine Research       | NFDI4Biodiversity |
+| Alfred Wegener Institute for Polar and Marine Research       | NFDI4DataScience  |
+| Alfred Wegener Institute for Polar and Marine Research       | NFDI4Earth        |
+| Anthropological Society (Munich)                             | NFDI4Objects      |
+| Arachnologische Gesellschaft                                 | NFDI4Biodiversity |
+| Arbeitskreis Provenienzforschung e.V.                        | NFDI4Memory       |
+| Archivschule Marburg                                         | NFDI4Memory       |
+| Archäologische Kommission für Niedersachsen                  | NFDI4Objects      |
+| Archäologisches Museum Hamburg und Stadtmuseum Harburg       | NFDI4Objects      |
+| Arthistoricum                                                | NFDI4Culture      |
+| Association for Data-Intensive Radio Astronomy               | PUNCH4NFDI        |
+| Association for Technology and Construction in Agriculture   | FAIRAgro          |
+| Association of German Architects                             | NFDI4Culture      |
+| Association of Population Based Cancer Registries in Germany | NFDI4Health       |
+| Association of states archaeologists                         | NFDI4Objects      |
+| BERD@NFDI                                                    | Base4NFDI         |
+| Bach-Archiv Leipzig                                          | NFDI4Culture      |
+| Bauhaus-Universität Weimar                                   | NFDI4Ing          |
+| Bavarian Academy of Sciences and Humanities                  | BERD@NFDI         |
+| Bavarian Academy of Sciences and Humanities                  | NFDI4Earth        |
+| Bavarian Academy of Sciences and Humanities                  | NFDI4Memory       |
+| Bavarian Academy of Sciences and Humanities                  | NFDI4Objects      |
+| Bavarian Academy of Sciences and Humanities                  | NFDIxCS           |
+| Bavarian Academy of Sciences and Humanities                  | PUNCH4NFDI        |
+| Bavarian Academy of Sciences and Humanities                  | Text+             |
+| Bavarian Forest National Park                                | NFDI4Biodiversity |
+| Bavarian Natural History Collections                         | NFDI4Biodiversity |
+| Bavarian Natural History Collections                         | NFDI4Objects      |
+| Bavarian State Archaeological Collection                     | NFDI4Objects      |
+| Bavarian State Archives                                      | FAIRAgro          |
+| Bavarian State Archives                                      | NFDI4Biodiversity |
+| Bavarian State Archives                                      | NFDI4Earth        |
+| Bavarian State Archives                                      | NFDI4Objects      |
+| Bavarian State Library                                       | NFDI4Culture      |
+| Bavarian State Library                                       | NFDI4Memory       |
+| Bavarian State Research Center for Agriculture               | FAIRAgro          |
+| Beethoven House                                              | NFDI4Culture      |
+| Beilstein Institute for the Advancement of Chemical Sciences | NFDI4Chem         |
+| Berlin State Library                                         | Base4NFDI         |
+| Berlin State Library                                         | NFDI4Memory       |
+
+```
+
 # Processing Data
 
 # Preserving Data