Advanced Topics - eXist: A NoSQL Database and Application Development Platform - page 476

XDM atomic value type eXist's Java class Notes

xs:yearMonthDuration YearMonthDuration

Value

Internally represented using a composition of
java.lang.String , int , and boolean .

xs:string StringValue

xs:normalizedString
xs:language
xs:NMTOKEN
xs:Name
xs:NCName
xs:ID
xs:IDREF
xs:ENTITY
xs:QName

Internally represented using
org.exist.dom.QName .

QNameValue

Internally represented using float .

xs:float FloatValue

Internally represented using double .

xs:double DoubleValue

Internally represented using java.math.BigDeci
mal .

xs:decimal DecimalValue

Internally represented using a composition of
java.lang.BigInteger and int .

xs:integer IntegerValue

xs:nonPositiveInteger
xs:negativeInteger
xs:long
xs:int
xs:short
xs:byte
xs:nonNegativeInteger
xs:unsignedLong
xs:unsignedInt
xs:unsignedShort
xs:unsignedByte
xs:positiveInteger

eXist has two Java implementations of each XDM node type . One is an in-memory
implementation, called Memtree, that solely retains the nodes in memory and is use‐
ful for computed node construction. The other is a persistent Document Object
Model (DOM) implementation that represents nodes that are stored in the database.