Converting four spaces indent to tab indent at Context class file. According to http://code.google.com/p/xe-core/wiki/PHPCodingConvension#Code_Indenting
Converting four spaces indent to tab indent at Context class file. According to http://code.google.com/p/xe-core/wiki/PHPCodingConvension#Code_Indenting

git-svn-id: 14219c7368885801070a2cc2c78cd4d5bff209d4@10503 201d5d3c-b55e-5fd7-737f-ddc643e51545

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