CssStylesheet[] styleSheets = PsiTreeUtil.getChildrenOfType(file, CssStylesheet.class);
if (styleSheets != null)
{
for (CssStylesheet styleSheet : styleSheets)
{
CssRulesetList rulesetList = PsiTreeUtil.getChildOfType(styleSheet, CssRulesetList.class);
if (rulesetList != null)
{
CssRuleset[] rulesets = PsiTreeUtil.getChildrenOfType(rulesetList, CssRuleset.class);
if (rulesets != null)
{