expression → symbology Relation

File in src/core/expression	Includes file in src/core/symbology
qgsexpressioncontextutils.cpp	qgsmarkersymbol.h
qgsexpressionfunction.cpp	qgsstyle.h
qgsexpressionfunction.cpp	qgssymbollayerutils.h
qgsexpressionutils.cpp	qgssymbollayerutils.h