| BaseMappingRuleContext | 
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| CreateRootRuleContext | 
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| DefaultQueryExecutionContext | 
 Default implementation that executes queries without any further activity. 
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| DropAttributeRuleContext | 
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| DropRootRuleContext | 
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| IfMacroContext | 
 Perhaps, shall replace usages right with TemplateQueryContextWithMacro 
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| InlineSwitchCaseContext | 
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| InsertMacroContext | 
 Context to evaluate a query of a INSERT macro. 
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| MappingScriptContext | 
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| MapRootRuleContext | 
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| MapSrcMacroContext | 
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| MapSrcMacroPostProcContext | 
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| PatternRuleContext | 
 Evgeny Gryaznov, May 17, 2010 
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| PropertyMacroContext | 
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| ReductionRuleQueryContext | 
 This context is for reduction rules. 
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| ReferenceMacroContext | 
 What Reference Macro resolution code could expect to know about outer world. 
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| SourceSubstituteMacroNodeContext | 
 Perhaps, shall replace usages right with TemplateQueryContextWithMacro 
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| SourceSubstituteMacroNodesContext | 
 Despite the name, the context serves not only to 'sourceNodesQuery' in macros but also to similar queries in
 rules (any sourceNodesQuery) in fact. 
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| TemplateArgumentContext | 
 Evgeny Gryaznov, 12/21/10 
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| TemplateQueryContext | 
 Context for operations of genContext parameter in generator's concept functions. 
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| TemplateQueryContextWithRule | 
 Evgeny Gryaznov, 11/15/10 
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| TemplateVarContext | 
 evgeny, 1/9/12 
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| WeavingAnchorContext | 
 Context for query that gives anchor node for a weaved node. 
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| WeavingMappingRuleContext | 
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