documentclass[a4paper]{article}
begin{document}
section{Title}
subsection{Subtitle}
Plain text.
subsection{Another subtitle}
More plain text.
end{document}

[a4paper]article
document
Title
Subtitle
Plain text.
Another subtitle More plain text.

Description Resource    Path    Location    Type
Undefined control sequence:  documentclass (followed by: {article})    document.tex    /Net-Thesis line 3  Texlipse Build Error
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Undefined control sequence:  begin (followed by: {document})   document.tex    /Net-Thesis line 5  Texlipse Build Error