sorry - not making much sense to me (possibly due to my trouble accessing the ELM spec)

which do to use? do I check for both? if both exist (as below) which to use?

```
"name" : "NullIncluded",
"context" : "Patient",
"accessLevel" : "Public",
"expression" : {
"type" : "Contains",
"operand" : [ {
"type" : "List",
"element" : [ {
"valueType" : "

{urn:hl7-org:elm-types:r1}

Integer",
"value" : "1",
"type" : "Literal"
}, {
"valueType" : "

{urn:hl7-org:elm-types:r1}

Integer",
"value" : "2",
"type" : "Literal"
}, {
"valueType" : "

{urn:hl7-org:elm-types:r1}

Integer",
"value" : "3",
"type" : "Literal"
}, {
"valueType" : "

{urn:hl7-org:elm-types:r1}

Integer",
"value" : "4",
"type" : "Literal"
}, {
"valueType" : "

{urn:hl7-org:elm-types:r1}

Integer",
"value" : "5",
"type" : "Literal"
} ]
}, {
"asType" : "

{urn:hl7-org:elm-types:r1}

Integer",
"type" : "As",
"operand" :

{ "type" : "Null" }

,
"asTypeSpecifier" : {
"name" : "

{urn:hl7-org:elm-types:r1}

Integer",
"type" : "NamedTypeSpecifier"
}
} ]
}
}, {
"name" : "NullIncludes",
"context" : "Patient",
"accessLevel" : "Public",
"expression" : {
"type" : "Includes",
"operand" : [ {
"type" : "As",
"operand" :

{ "type" : "Null" }

,
"asTypeSpecifier" : {
"type" : "ListTypeSpecifier",
"elementType" : {
"name" : "

{urn:hl7-org:elm-types:r1}

Integer",
"type" : "NamedTypeSpecifier"
}
}
}, {
```

thanks again!