returns the offset of the block , which semantically represents a pointer to the start of the block . concode_field_sep String offset concode_elem_sep String SEPARATOR concode_elem_sep String parentId concode_elem_sep long blockSize concode_field_sep PageKey withParentId concode_elem_sep long getBlockSize concode_elem_sep boolean isValidFormat concode_elem_sep Integer getOffsetInt concode_elem_sep String toString concode_elem_sep String getParentId
String function ( ) { return offset ; }