Trivial Description
Both Matlab source code and Objective-C source code have the same suffix, which is .m. Therefore, Matlab has additional match value in mime types.xml.
In tika-mimetypes.xml Matlab is defined as:
<mime-type type="text/x-matlab">
<_comment>Matlab source code</_comment>
<magic priority="50">
<match value="function [" type="string" offset="0"/>
</magic>
<!-- <glob pattern="*.m"/> - conflicts with text/x-objcsrc -->
<sub-class-of type="text/plain"/>
</mime-type>
However, Matlab codes does not always start with "function [“. Therefore, some Matlab codes are detected as text/x-bojcsrc. Based on the source codes collected from NOAA Paleoclimatology Software Resources, many Matlab codes have match value like these (problematic files are attached as an example):
<mime-type type="text/x-matlab">
<_comment>Matlab source code</_comment>
<magic priority="50">
<match value="function" type="string" offset="0"/>
<match value="%" type="string" offset="0"/>
</magic>
<!-- <glob pattern="*.m"/> - conflicts with text/x-objcsrc -->
<sub-class-of type="text/plain"/>
</mime-type>
Conducted several detecting tests by using different Matlab packages obtained from NOAA Paleoclimatology Software Resources, with/without Custom-mimtypes.xml. Results are attached. As a results, total 103 Matlab files are detected correctly with custom-mimetypes.xml, while 42 Matlab files are detected as Matlab files without custom-mimetypes.xml (= only with current match value). However, this match value for Matlab source code could be only common in Paleoclimatology community.