add description and improve combination and reference keywords
add description and improve combination and reference keywords

apioo/psx-schema,apioo/psx-schema,apioo/psx-schema,apioo/psx-schema,apioo/psx-schema,apioo/psx-schema,apioo/psx-schema,apioo/psx-schema,apioo/psx-schema,apioo/psx-schema,apioo/psx-schema