How to install MetaUML for LyX?
How to use it? Is there a site where I can find resources about this subject?
And if not, is there an equivalent tool for this not Dia?
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Is this what you are looking for: http://jack-kelly.com/latex_lyx_metauml_zotero_on_ubuntu
Install MetaUML (after installing TeXlive 2011) In the install file, change the directory
/usr/share/texmf-texlive(or whatever your TeX Live install directory is).
Tell Lyx to pass the -shell-escape parameter to pdflatex. Go to Tools > Preferences > File Handling. Select "LaTeX (pdflatex) -> PDF (pdflatex)". Modify the "Converted:" field so it reads:
pdflatex -shell-escape $$i. Click "Modify" and "Save".
For MetaUML: The following is needed in order to make the code compatible with both latex /dvips and pdflatex.