Package net.sf.saxon.om

Interface Item

All Superinterfaces:
GroundedValue, Sequence
All Known Subinterfaces:
AnyExternalObject, FunctionItem, MutableNodeInfo, NodeInfo, SiblingCountingNode, SteppingNode, VirtualNode
All Known Implementing Classes:
Abs, AbsentExtensionElement, AbstractArrayItem, AbstractFunction, AbstractNodeWrapper, AbstractVirtualNode, AccessorFn, AccessorFn.DayFromDate, AccessorFn.DayFromDateTime, AccessorFn.DaysFromDuration, AccessorFn.HoursFromDateTime, AccessorFn.HoursFromDuration, AccessorFn.HoursFromTime, AccessorFn.LocalNameFromQName, AccessorFn.MinutesFromDateTime, AccessorFn.MinutesFromDuration, AccessorFn.MinutesFromTime, AccessorFn.MonthFromDate, AccessorFn.MonthFromDateTime, AccessorFn.MonthsFromDuration, AccessorFn.NamespaceUriFromQName, AccessorFn.PrefixFromQName, AccessorFn.SecondsFromDateTime, AccessorFn.SecondsFromDuration, AccessorFn.SecondsFromTime, AccessorFn.TimezoneFromDate, AccessorFn.TimezoneFromDateTime, AccessorFn.TimezoneFromTime, AccessorFn.YearFromDate, AccessorFn.YearFromDateTime, AccessorFn.YearsFromDuration, AccumulatorFn, AccumulatorFn.AccumulatorAfter, AccumulatorFn.AccumulatorBefore, Adjust_1, Adjust_2, Aggregate, AllDifferent, AllEqual, AnalyzeStringFn, AnalyzeUri, AnnotationParent, AnyURIValue, ApplyFn, ArrayFunctionSet.ArrayAppend, ArrayFunctionSet.ArrayBuild, ArrayFunctionSet.ArrayEmpty, ArrayFunctionSet.ArrayExists, ArrayFunctionSet.ArrayFilter, ArrayFunctionSet.ArrayFlatten, ArrayFunctionSet.ArrayFoldLeft, ArrayFunctionSet.ArrayFoldRight, ArrayFunctionSet.ArrayFoot, ArrayFunctionSet.ArrayForEach, ArrayFunctionSet.ArrayForEachPair, ArrayFunctionSet.ArrayFromSequence, ArrayFunctionSet.ArrayGeneratingFunction, ArrayFunctionSet.ArrayGet, ArrayFunctionSet.ArrayHead, ArrayFunctionSet.ArrayIndexWhere, ArrayFunctionSet.ArrayInsertBefore, ArrayFunctionSet.ArrayJoin, ArrayFunctionSet.ArrayMembers, ArrayFunctionSet.ArrayOfMembers, ArrayFunctionSet.ArrayPut, ArrayFunctionSet.ArrayRemove, ArrayFunctionSet.ArrayReplace, ArrayFunctionSet.ArrayReverse, ArrayFunctionSet.ArraySize, ArrayFunctionSet.ArraySlice, ArrayFunctionSet.ArraySplit, ArrayFunctionSet.ArraySubarray, ArrayFunctionSet.ArrayTail, ArrayFunctionSet.ArrayToSequence, ArrayFunctionSet.ArrayTrunk, ArrayItem, ArraySort, AtomicConstructorFunction, AtomicEqual, AtomicValue, AttributeImpl, AvailableEnvironmentVariables, AvailableSystemProperties, Average, AxiomAttributeWrapper, AxiomDocumentNodeWrapper, AxiomElementNodeWrapper, AxiomLeafNodeWrapper, AxiomParentNodeWrapper, Base64BinaryValue, BaseUri_1, BigDecimalValue, BigIntegerValue, Bindery.FailureValue, BooleanFn, BooleanValue, BuildURI, CalendarValue, CallableFunction, Ceiling, CharactersFn, CharactersFn, CharFn, CodepointEqual, CodepointsToString, CoercedFunction, CollatingFunctionFixed, CollatingFunctionFree, CollationKeyFn, CollectionFn, CommentImpl, Compare, CompileQuery, CompileStylesheet, CompileXPath, Concat, Concat31, ConstantFunction, ConstantFunction.False, ConstantFunction.True, Contains, ContainsToken, ContextAccessorFunction, ContextItemAccessorFunction, ContextItemAccessorFunction.Number_0, ContextItemAccessorFunction.StringAccessor, CopyOfFn, Count, Current, CurrentGroup, CurrentGroupingKey, CurrentMergeGroup, CurrentMergeKey, CurrentOutputUri, CurriedFunction, Data_1, DataElement, DateTimeConstructor, DateTimeValue, DateValue, DayTimeDurationValue, DecimalDivide, DecimalValue, DecodeFromURI, DeepEqual, DelegatingArrayItem, DelegatingMapItem, DictionaryMap, DistinctValues, Doc, Doc_2, DocAvailable, DocumentFn, DocumentImpl, DocumentUri_1, DOM4JNodeWrapper, DominoAttr, DominoNode, DOMNodeWrapper, DoubleValue, DuplicateValues, DurationValue, DynamicContextAccessor, DynamicContextAccessor.CurrentDate, DynamicContextAccessor.CurrentDateTime, DynamicContextAccessor.CurrentTime, DynamicContextAccessor.DefaultLanguage, DynamicContextAccessor.ImplicitTimezone, ElementAvailable, ElementImpl, Empty, EncodeForUri, EndsWith, EnvironmentVariable, EQName, Error, EscapeHtmlUri, EscapeNCName, Eval, Evaluate, EveryFn, Exists, ExpandedQNameFn, EXPathBinaryFunctionSet.BinaryAnd, EXPathBinaryFunctionSet.BinaryBin, EXPathBinaryFunctionSet.BinaryDecodeString, EXPathBinaryFunctionSet.BinaryEncodeString, EXPathBinaryFunctionSet.BinaryFind, EXPathBinaryFunctionSet.BinaryFromOctets, EXPathBinaryFunctionSet.BinaryHex, EXPathBinaryFunctionSet.BinaryInsertBefore, EXPathBinaryFunctionSet.BinaryJoin, EXPathBinaryFunctionSet.BinaryLength, EXPathBinaryFunctionSet.BinaryNot, EXPathBinaryFunctionSet.BinaryOctal, EXPathBinaryFunctionSet.BinaryOr, EXPathBinaryFunctionSet.BinaryPackDouble, EXPathBinaryFunctionSet.BinaryPackFloat, EXPathBinaryFunctionSet.BinaryPackInteger, EXPathBinaryFunctionSet.BinaryPadLeft, EXPathBinaryFunctionSet.BinaryPadRight, EXPathBinaryFunctionSet.BinaryPart, EXPathBinaryFunctionSet.BinaryShift, EXPathBinaryFunctionSet.BinaryToOctets, EXPathBinaryFunctionSet.BinaryUnpackDouble, EXPathBinaryFunctionSet.BinaryUnpackFloat, EXPathBinaryFunctionSet.BinaryUnpackInteger, EXPathBinaryFunctionSet.BinaryUnpackUnsignedInteger, EXPathBinaryFunctionSet.BinaryVersion, EXPathBinaryFunctionSet.BinaryXor, EXPathFileFunctionSet.FileAppend, EXPathFileFunctionSet.FileAppendBinary, EXPathFileFunctionSet.FileAppendText, EXPathFileFunctionSet.FileAppendTextLines, EXPathFileFunctionSet.FileBaseDir, EXPathFileFunctionSet.FileChildren, EXPathFileFunctionSet.FileCopy, EXPathFileFunctionSet.FileCreateDir, EXPathFileFunctionSet.FileCreateTempDir, EXPathFileFunctionSet.FileCreateTempFile, EXPathFileFunctionSet.FileCurrentDir, EXPathFileFunctionSet.FileDelete, EXPathFileFunctionSet.FileDirSeparator, EXPathFileFunctionSet.FileExists, EXPathFileFunctionSet.FileIsDir, EXPathFileFunctionSet.FileIsFile, EXPathFileFunctionSet.FileLastModified, EXPathFileFunctionSet.FileLineSeparator, EXPathFileFunctionSet.FileList, EXPathFileFunctionSet.FileMove, EXPathFileFunctionSet.FileName, EXPathFileFunctionSet.FileParent, EXPathFileFunctionSet.FilePathSeparator, EXPathFileFunctionSet.FilePathToNative, EXPathFileFunctionSet.FilePathToUri, EXPathFileFunctionSet.FileReadBinary, EXPathFileFunctionSet.FileReadText, EXPathFileFunctionSet.FileReadTextLines, EXPathFileFunctionSet.FileResolvePath, EXPathFileFunctionSet.FileSize, EXPathFileFunctionSet.FileTempDir, EXPathFileFunctionSet.FileWrite, EXPathFileFunctionSet.FileWriteBinary, EXPathFileFunctionSet.FileWriteText, EXPathFileFunctionSet.FileWriteTextLines, ExpressionFn, ExsltCommonFunctionSet.NodeSetFn, ExsltCommonFunctionSet.ObjectTypeFn, ExtensionInstruction, FilterFn, FleetingDocumentNode, FleetingElementNode, FleetingNode, FleetingParentNode, FloatValue, Floor, FoldingFunction, FoldLeftFn, FoldRightFn, FootFn, ForEachFn, ForEachPairFn, FormatDate, FormatInteger, FormatNumber, FunctionAnnotations, FunctionArity, FunctionAvailable, FunctionLookup, FunctionName, GDateValue, GDayValue, GenerateId_1, GMonthDayValue, GMonthValue, GroupStarting, GYearMonthValue, GYearValue, HasChildren_1, HashTrieMap, HeadFn, HexBinaryValue, HighestOrLowest, HighestOrLowest, IdentityFn, Idref, ImmutableArrayItem, Index, IndexOf, IndexWhere, Innermost, InScopeNamespacesFn, InScopePrefixes, InsertBefore, Int64Value, IntegerValue, Intersperse, IriToUri, IsNaN, ItemsAt, ItemsEnding, ItemsEnding.ItemsBefore, ItemsEnding.ItemsUntil, ItemsStarting, ItemsStarting.ItemsAfter, ItemsStarting.ItemsFrom, IterateWhileFn, IXSLFunctionSet.Call, IXSLFunctionSet.Eval, IXSLFunctionSet.ScheduleActionFn, IXSLFunctionSet.Source, IXSLFunctionSet.Stub, IXSLPromise, IXSLRemoveAttribute, IXSLRemoveProperty, IXSLScheduleAction, IXSLSetAttribute, IXSLSetProperty, IXSLSetStyle, JDOM2NodeWrapper, JsonDoc, JsonToXMLFn, KeyFn, KeyMap, Lang, LastModified, Leading, ListCastableFunction, ListConstructorFunction, LiteralResultElement, LoadXqueryModule, LocalName_1, LowerCase, MapCreate, MapFunctionSet.MapBuild, MapFunctionSet.MapContains, MapFunctionSet.MapEntries, MapFunctionSet.MapEntry, MapFunctionSet.MapFilter, MapFunctionSet.MapFind, MapFunctionSet.MapForEach, MapFunctionSet.MapGet, MapFunctionSet.MapKeys, MapFunctionSet.MapMerge, MapFunctionSet.MapOfPairs, MapFunctionSet.MapPair, MapFunctionSet.MapPairs, MapFunctionSet.MapPut, MapFunctionSet.MapRemove, MapFunctionSet.MapSize, MapItem, MapSearch, MapUntypedContains, Matches, MathFunctionSet.Atan2Fn, MathFunctionSet.PiFn, MathFunctionSet.PowFn, MathFunctionSet.TrigFn1, MemoFunction, MemoFunction.NodeSurrogate, MessageCount, Minimax, Minimax.Max, Minimax.Min, Name_1, NamespaceForPrefix, NamespaceNode, NamespaceUriFn_1, NewAttribute, NewComment, NewDocument, NewElement, NewNamespace, NewProcessingInstruction, NewText, Nilled_1, NodeImpl, NodeName_1, NormalizeSpace_1, NormalizeUnicode, NotationValue, NotFn, Number_1, NumericValue, ObjectMap, ObjectValue, OpFn, OriginalFunction, Orphan, Outermost, Parcel, ParcelFn, ParentNodeImpl, Parse, ParseHtml, ParseIetfDate, ParseInteger, ParseJsonFn, ParseQNameFn, ParseURI, ParseXml, ParseXmlFragment, ParseXPath, Partition, Parts, Path_1, PedigreeArrayItem, PedigreeFn, PedigreeMapItem, PositionAndLast, PositionAndLast.Last, PositionAndLast.Position, ProcInstImpl, Put, QNameFn, QNameValue, QualifiedNameValue, QueryFn, RandomNumberGenerator, RangeKey, ReadBinaryResource, RebasedNode, RegexFunction, RegexFunctionSansFlags, RegexGroup, Remove, Replace, ReplaceWith, Replicate, ResolveQName, ResolveURI, Reverse, Root_1, Round, RoundHalfToEven, SaxonAssign, SaxonChange, SaxonDeepEqual, SaxonDeepUpdate, SaxonDelete, SaxonDo, SaxonDoctype, SaxonEntityRef, SaxonImportQuery, SaxonInsert, SaxonParam, SaxonPreprocess, SaxonRename, SaxonReplace, SaxonSlice, SaxonTabulateMaps, SaxonUpdate, SaxonWhile, ScalarSystemFunction, SchemaElement, SchemaFn, SchemaTypeFn, SendMail, SequenceMatching, SequenceMatching.ContainsSequence, SequenceMatching.EndsWithSequence, SequenceMatching.StartsWithSequence, Serialize, Serialize, SimpleArrayItem, SingleEntryMap, Slice, SnapshotFn, SnapshotNode, SomeFn, Sort_1, Sort_2, Sort_3, SpaceStrippedNode, SQLClose, SQLColumn, SQLConnect, SQLConnectFn, SQLDelete, SQLDeleteFn, SQLExecute, SQLExecuteFn, SQLInsert, SQLInsertFn, SQLPreparedQueryFn, SQLPreparedStatementFn, SQLQuery, SQLQueryFn, SQLTableFn, SQLUpdate, SQLUpdateFn, StartsWith, StaticBaseUri, StaticContextAccessor, StaticContextAccessor.DefaultCollation, StreamableUserFunction, StreamAvailable, StreamFn, String_1, StringJoin, StringLength_1, StringToCodepoints, StringValue, StyleElement, Subsequence_2, Subsequence_3, Substring, SubstringAfter, SubstringBefore, Sum, SuperId, SuperId.ElementWithId, SuperId.Id, SystemFunction, SystemFunctionWithBoundContextItem, SystemProperty, TailFn, TextFragmentValue, TextImpl, TextValueTemplateNode, TimestampFn, TimeValue, TinyAttributeImpl, TinyDocumentImpl, TinyElementImpl, TinyNodeImpl, TinyParentNodeImpl, TinyTextImpl, TinyTextualElement, TinyTextualElement.TinyTextualElementText, Tokenize_1, Tokenize_3, Trace, TransformFn, TransformFn, TransitiveClosure, Translate, TreatFn, TreatFn.ExactlyOne, TreatFn.OneOrMore, TreatFn.ZeroOrOne, Trunk, Tuple, TypeAvailable, TypeStrippedNode, UnescapeNCName, Unindexed, UnionCastableFunction, UnionConstructorFunction, UnknownElement, Unordered, UnparcelFn, UnparsedEntity, UnparsedEntity.UnparsedEntityPublicId, UnparsedEntity.UnparsedEntityUri, UnparsedText, UnparsedTextAvailable, UnparsedTextFunction, UnparsedTextLines, UnresolvedXQueryFunctionItem, UpperCase, UriCollection, URIFunctions, UserFunction, UserFunctionReference.BoundUserFunction, ValidateFn, VendorFunctionSetHE.ArrayAsSequenceOfMaps, VendorFunctionSetHE.ConcatenateSequences, VendorFunctionSetHE.DynamicErrorInfoFn, VendorFunctionSetHE.HasLocalNamespaces, VendorFunctionSetHE.HasUniformNamespaces, VendorFunctionSetHE.IsWholeNumberFn, VendorFunctionSetHE.MapAsSequenceOfMaps, VendorFunctionSetHE.YesNoBoolean, VendorFunctionSetPE.AdjustToCivilTime, VendorFunctionSetPE.Base64BinaryToOctets, VendorFunctionSetPE.Base64BinaryToString, VendorFunctionSetPE.ColumnNumber, VendorFunctionSetPE.ConfigurationFn, VendorFunctionSetPE.ContextFn, VendorFunctionSetPE.ControllerFn, VendorFunctionSetPE.CurrentModeName, VendorFunctionSetPE.DiscardDocument, VendorFunctionSetPE.GetContext, VendorFunctionSetPE.GetPseudoAttribute, VendorFunctionSetPE.HasSameNodes, VendorFunctionSetPE.HexBinaryToOctets, VendorFunctionSetPE.HexBinaryToString, VendorFunctionSetPE.InSummerTime, VendorFunctionSetPE.IsDefaulted, VendorFunctionSetPE.LineNumber, VendorFunctionSetPE.NamespaceNodeFn, VendorFunctionSetPE.OctetsToBase64Binary, VendorFunctionSetPE.OctetsToHexBinary, VendorFunctionSetPE.ParseDateTime, VendorFunctionSetPE.PrintStack, VendorFunctionSetPE.StringToBase64BinaryFn, VendorFunctionSetPE.StringToHexBinaryFn, VendorFunctionSetPE.StringToUTF8, VendorFunctionSetPE.SystemId, VendorFunctionSetPE.TunnelParamsFn, VendorFunctionSetPE.TypeAnnotationFn, VendorFunctionSetPE.UnparsedEntities, VendorFunctionSetPE.ValidCharacter, VirtualCopy, VirtualUntypedCopy, VoidFn, WhitespaceTextImpl, WithPedigree, XdmToJsonFn, XMLToJsonFn, XOMDocumentWrapper, XOMNodeWrapper, XQueryFn, XSDAlternative, XSDAnnotation, XSDAny, XSDAnyAttribute, XSDAssert, XSDAttribute, XSDAttributeGroup, XSDComplexContent, XSDComplexContentRestriction, XSDComplexType, XSDCompositor, XSDDefaultOpenContent, XSDDocumentation, XSDElement, XSDExtension, XSDFacet, XSDFieldOrSelector, XSDGroup, XSDIdentityConstraint, XSDImport, XSDInclude, XSDList, XSDNotation, XSDOpenContent, XSDOverride, XSDRedefine, XSDSchema, XSDSimpleContent, XSDSimpleContentRestriction, XSDSimpleType, XSDSimpleTypeRestriction, XSDUnion, XSLAccept, XSLAcceptExpose, XSLAccumulator, XSLAccumulatorRule, XSLAnalyzeString, XSLApplyImports, XSLApplyTemplates, XSLArray, XSLArrayMember, XSLAssert, XSLAttribute, XSLAttributeSet, XSLBreak, XSLBreakOrContinue, XSLCallTemplate, XSLCatch, XSLCharacterMap, XSLChoose, XSLChooseOrSwitch, XSLComment, XSLContextItem, XSLCopy, XSLCopyOf, XSLDecimalFormat, XSLDocument, XSLElement, XSLEvaluate, XSLExpose, XSLFallback, XSLForEach, XSLForEachGroup, XSLFork, XSLFunction, XSLGeneralIncorporate, XSLGeneralVariable, XSLGlobalContextItem, XSLGlobalParam, XSLGlobalVariable, XSLIf, XSLImport, XSLImportSchema, XSLInclude, XSLItemType, XSLIterate, XSLKey, XSLLeafNodeConstructor, XSLLocalParam, XSLLocalVariable, XSLMap, XSLMapEntry, XSLMatchingSubstring, XSLMerge, XSLMergeAction, XSLMergeKey, XSLMergeSource, XSLMessage, XSLMode, XSLModuleRoot, XSLNamespace, XSLNamespaceAlias, XSLNextIteration, XSLNextMatch, XSLNumber, XSLOnCompletion, XSLOnEmpty, XSLOnNonEmpty, XSLOtherwise, XSLOutput, XSLOutputCharacter, XSLOverride, XSLPackage, XSLPerformSort, XSLPreserveSpace, XSLProcessingInstruction, XSLResultDocument, XSLSequence, XSLSort, XSLSortOrMergeKey, XSLSourceDocument, XSLStylesheet, XSLSwitch, XSLTemplate, XSLText, XSLTry, XSLUsePackage, XSLValueOf, XSLWhen, XSLWherePopulated, XSLWithParam, YearMonthDurationValue
public interface Item extends GroundedValue
An Item is an object that can occur as a member of a sequence. It corresponds directly to the concept of an item in the XPath 2.0 data model. There are four kinds of Item: atomic values, nodes, function items, and external objects.

This interface is part of the public Saxon API. As such (starting from Saxon 8.4), methods that form part of the stable API are labelled with a JavaDoc "since" tag to identify the Saxon release at which they were introduced.

Note: there is no method getItemType(). This is to avoid having to implement it on every implementation of NodeInfo. Instead, use the static method Type.getItemType(Item).

  • Method Details

    • getGenre

      Genre getGenre()
      Get the genre of this item (to distinguish the top-level categories of item, such as nodes, atomic values, and functions)
      Returns:
      the genre

    • head

      default Item head()
      Get the first item in the sequence. Differs from the superclass Sequence in that * no exception is thrown.
      Specified by:
      head in interface GroundedValue
      Specified by:
      head in interface Sequence
      Returns:
      the first item in the sequence if there is one, or null if the sequence is empty

    • getUnicodeStringValue

      UnicodeString getUnicodeStringValue()
      Get the value of the item as a Unicode string. For nodes, this is the string value of the node as defined in the XPath 2.0 data model, except that all nodes are treated as being untyped: it is not an error to get the string value of a node with a complex type. For atomic values, the method returns the result of casting the atomic value to a string.
      Specified by:
      getUnicodeStringValue in interface GroundedValue
      Returns:
      the string value of the item
      Throws:
      UnsupportedOperationException - if the item is a function item (an unchecked exception is used here to avoid introducing exception handling to a large number of paths where it is not needed)
      Since:
      8.4

    • getStringValue

      default String getStringValue()
      Get the value of the item as a Java string. For nodes, this is the string value of the node as defined in the XPath 2.0 data model, except that all nodes are treated as being untyped: it is not an error to get the string value of a node with a complex type. For atomic values, the method returns the result of casting the atomic value to a string.
      Specified by:
      getStringValue in interface GroundedValue
      Returns:
      the string value of the item
      Throws:
      UnsupportedOperationException - if the item is a function item (an unchecked exception is used here to avoid introducing exception handling to a large number of paths where it is not needed)
      Since:
      8.4

    • atomize

      AtomicSequence atomize() throws XPathException
      Atomize the item.
      Returns:
      the result of atomization
      Throws:
      XPathException - if atomization is not allowed for this kind of item

    • toShortString

      default String toShortString()
      Provide a short string showing the contents of the item, suitable for use in error messages
      Specified by:
      toShortString in interface GroundedValue
      Returns:
      a depiction of the item suitable for use in error messages

    • itemAt

      default Item itemAt(int n)
      Get the n'th item in the value, counting from 0
      Specified by:
      itemAt in interface GroundedValue
      Parameters:
      n - the index of the required item, with 0 representing the first item in the sequence
      Returns:
      the n'th item if it exists, or null otherwise

    • subsequence

      default GroundedValue subsequence(int start, int length)
      Get a subsequence of the value
      Specified by:
      subsequence in interface GroundedValue
      Parameters:
      start - the index of the first item to be included in the result, counting from zero. A negative value is taken as zero. If the value is beyond the end of the sequence, an empty sequence is returned
      length - the number of items to be included in the result. Specify Integer.MAX_VALUE to get the subsequence up to the end of the base sequence. If the value is negative, an empty sequence is returned. If the value goes off the end of the sequence, the result returns items up to the end of the sequence
      Returns:
      the required subsequence. If min is

    • getLength

      default int getLength()
      Get the size of the value (the number of items)
      Specified by:
      getLength in interface GroundedValue
      Returns:
      the number of items in the sequence. Note that for a single item, including a map or array, the result is always 1 (one).

    • iterate

      default SingletonIterator iterate()
      Get an iterator over all the items in the sequence
      Specified by:
      iterate in interface GroundedValue
      Specified by:
      iterate in interface Sequence
      Returns:
      an iterator over all the items

    • reduce

      default GroundedValue reduce()
      Reduce the sequence to its simplest form. If the value is an empty sequence, the result will be EmptySequence.getInstance(). If the value is a single atomic value, the result will be an instance of AtomicValue. If the value is a single item of any other kind, the result will be an instance of Item. Otherwise, the result will typically be unchanged.
      Specified by:
      reduce in interface GroundedValue
      Returns:
      the simplified sequence

    • isStreamed

      default boolean isStreamed()
      Ask whether this is a node in a streamed document
      Returns:
      true if the node is in a document being processed using streaming