Package net.sf.saxon.style

## Class XSLMergeKey

- java.lang.Object
- - net.sf.saxon.tree.linked.NodeImpl
  - - net.sf.saxon.tree.linked.ParentNodeImpl
    - - net.sf.saxon.tree.linked.ElementImpl
      - - net.sf.saxon.style.StyleElement
        - - net.sf.saxon.style.XSLSortOrMergeKey
          - - net.sf.saxon.style.XSLMergeKey

- All Implemented Interfaces:
    `javax.xml.transform.Source`, `javax.xml.transform.SourceLocator`, `GroundedValue`, `Item`, `MutableNodeInfo`, `NamespaceResolver`, `NodeInfo`, `Sequence`, `Location`, `SteppingNode<NodeImpl>`, `SiblingCountingNode`, `org.xml.sax.Locator`

      public class XSLMergeKey
      extends XSLSortOrMergeKey

  An xsl:merge-key element in the stylesheet.

- - ### Nested Class Summary

    - ### Nested classes/interfaces inherited from class net.sf.saxon.style.StyleElement

      `StyleElement.OnFailure`

  - ### Field Summary

    - ### Fields inherited from class net.sf.saxon.style.XSLSortOrMergeKey

      `caseOrder, collationName, dataType, lang, order, select, sortKeyDefinition, stable, useDefaultCollation`

    - ### Fields inherited from class net.sf.saxon.style.StyleElement

      `ACTION_COMPILE, ACTION_FIXUP, ACTION_OPTIMIZE, ACTION_PROCESS_ATTRIBUTES, ACTION_TYPECHECK, ACTION_VALIDATE, actionsCompleted, defaultCollationName, defaultMode, defaultXPathNamespace, expandText, extensionNamespaces, reportingCircumstances, staticContext, validationError, version`

    - ### Fields inherited from class net.sf.saxon.tree.linked.NodeImpl

      `NODE_LETTER`

    - ### Fields inherited from interface net.sf.saxon.om.NodeInfo

      `IS_DTD_TYPE, IS_NILLED`

  - ### Constructor Summary

    Constructors
    Constructor | Description
    --- | ---
    `XSLMergeKey()` |

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method | Description
    --- | --- | ---
    `protected java.lang.String` | `getErrorCode()` |
    `protected ItemType` | `getReturnedItemType()` | Determine the type of item returned by this instruction (only relevant if it is an instruction).
    `void` | `prepareAttributes()` | Set the attribute list for the element.

    - ### Methods inherited from class net.sf.saxon.style.XSLSortOrMergeKey

      `compile, getSortKeyDefinition, getStable, mayContainSequenceConstructor, validate`

    - ### Methods inherited from class net.sf.saxon.style.StyleElement

      `allocateLocation, bindLocalVariable, bindVariable, checkEmpty, checkTopLevel, checkUnknownAttribute, compileDeclaration, compileError, compileError, compileError, compileError, compileError, compileError, compileErrorInAttribute, compileSequenceConstructor, compileSequenceConstructor, compileWarning, compileWarning, compileWarning, fixupReferences, generateId, getAttributeValue, getBaseURI, getBindingInformation, getCompilation, getConfiguration, getContainingPackage, getContainingSlotManager, getDeclaredVisibility, getDefaultCollationName, getDefaultXPathNamespace, getNamespaceResolver, getObjectName, getPackageData, getPrincipalStylesheetModule, getProperties, getSchemaType, getStaticContext, getStaticContext, getTypeAnnotation, getUsedPackage, getVisibility, getWithParamInstructions, getXslOriginal, hasImplicitBinding, index, invalidAttribute, isDeclaration, isExtensionAttributeAllowed, isExtensionNamespace, isInstruction, isPermittedChild, isSchemaAware, issueWarning, issueWarning, isTopLevel, isWithinDeclaredStreamableConstruct, makeAttributeValueTemplate, makeExpression, makeExpressionVisitor, makeQName, makeRetainedStaticContext, makeSequenceType, markTailCalls, mayContainFallback, mayContainParam, postValidate, processAllAttributes, processBooleanAttribute, processStandardAttributes, processVersionAttribute, reportAbsence, requireSyntaxExtensions, seesAvuncularVariables, setCompilation, setObjectName, setValidationError, substituteFor, typeCheck, typeCheck, validateChildren, validateSubtree, validateValidationAttribute`

    - ### Methods inherited from class net.sf.saxon.tree.linked.ElementImpl

      `addAttribute, addNamespace, addNamespace, attributes, checkNotNamespaceSensitiveElement, copy, delete, fixupInsertedNamespaces, generateId, getAllNamespaces, getAttributeValue, getColumnNumber, getDeclaredNamespaces, getLineNumber, getNodeKind, getNodeName, getRoot, getSchemaType, getSystemId, getURIForPrefix, initialise, isId, isIdref, isInScopeNamespace, isNilled, iteratePrefixes, removeAttribute, removeNamespace, removeTypeAnnotation, rename, replaceStringValue, setAttributeInfo, setAttributes, setLocation, setNamespaceMap, setNilled, setNodeName, setSystemId, setTypeAnnotation`

    - ### Methods inherited from class net.sf.saxon.tree.linked.ParentNodeImpl

      `addChild, children, compact, getFirstChild, getLastChild, getNthChild, getNumberOfChildren, getRawSequenceNumber, getSequenceNumber, getStringValue, getStringValueCS, hasChildNodes, insertChildren, iterateChildren, removeChild, replaceChildrenAt, setChildren, setRawSequenceNumber`

    - ### Methods inherited from class net.sf.saxon.tree.linked.NodeImpl

      `atomize, compareOrder, effectiveBooleanValue, equals, getDisplayName, getFingerprint, getLocalPart, getNamePool, getNextInDocument, getNextSibling, getParent, getPhysicalRoot, getPrefix, getPreviousInDocument, getPreviousSibling, getRawParent, getSiblingPosition, getSuccessorElement, getTreeInfo, getURI, hasFingerprint, head, insertSiblings, isDeleted, iterateAxis, iterateAxis, newBuilder, replace, saveLocation, setRawParent, setSiblingPosition`

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

    - ### Methods inherited from interface net.sf.saxon.om.GroundedValue

      `asIterable, concatenate, containsNode, materialize`

    - ### Methods inherited from interface net.sf.saxon.om.Item

      `getLength, itemAt, iterate, reduce, subsequence`

    - ### Methods inherited from interface net.sf.saxon.om.NodeInfo

      `children, equals, getGenre, getPublicId, hashCode, isSameNodeInfo, isStreamed, toShortString`

    - ### Methods inherited from interface net.sf.saxon.om.Sequence

      `makeRepeatable`

    - ### Methods inherited from interface javax.xml.transform.Source

      `isEmpty`

- - ### Constructor Detail

    - #### XSLMergeKey

          public XSLMergeKey()

  - ### Method Detail

    - #### prepareAttributes

          public void prepareAttributes()

      Description copied from class: `StyleElement`
      Set the attribute list for the element. This is called to process the attributes (note the distinction from processAttributes in the superclass). Must be supplied in a subclass
      Overrides:
        `prepareAttributes` in class `XSLSortOrMergeKey`

    - #### getReturnedItemType

          protected ItemType getReturnedItemType()

      Determine the type of item returned by this instruction (only relevant if it is an instruction). Default implementation returns Type.ITEM, indicating that we don't know, it might be anything. Returns null in the case of an element such as xsl:sort or xsl:variable that can appear in a sequence constructor but contributes nothing to the result sequence.
      Returns:
        the item type returned

    - #### getErrorCode

          protected java.lang.String getErrorCode()

      Overrides:
        `getErrorCode` in class `XSLSortOrMergeKey`