## net.sf.saxon.functions
Class Extensions

    java.lang.Object
      |
      +--net.sf.saxon.functions.Extensions

public class Extensions
extends java.lang.Object

This class implements functions that are supplied as standard with SAXON, but which are not defined in the XSLT or XPath specifications.

To invoke these functions, use a function call of the form prefix:name() where name is the method name, and prefix maps to a URI such as http://saxon.sf.net/net.sf.saxon.functions.Extensions (only the part of the URI after the last slash is important).

Method Summary
`static SequenceIterator` `after(XPathContext context, SequenceIterator ns1, SequenceIterator ns2)` Find all the nodes in ns1 that are after the first node in ns2.
`static byte[]` `base64BinaryToOctets(Base64BinaryValue in)` Convert a base64Binary value to a sequence of integers representing the octets contained in the value
`static SecondsDurationValue` `dayTimeDurationFromSeconds(double arg)` Get a dayTimeDuration value corresponding to a given number of seconds
`static java.math.BigDecimal` `decimalDivide(java.math.BigDecimal arg1, java.math.BigDecimal arg2, int scale)` Perform decimal division to a user-specified precision
`static DocumentInfo` `discardDocument(XPathContext context, DocumentInfo doc)` Remove a document from the document pool.
`static SequenceIterator` `distinct(XPathContext context, SequenceIterator in, Evaluate.PreparedExpression pexp)` Given a node-set, return a subset that includes only nodes with distinct string-values for the supplied expression
`static XPathContext` `getContext(XPathContext c)` Return the XPathContext object
`static java.lang.String` `getPseudoAttribute(XPathContext c, java.lang.String name)` Get a pseudo-attribute of a processing instruction.
`static boolean` `hasSameNodes(SequenceIterator p1, SequenceIterator p2)` Determine whether two node-sets contain the same nodes
`static byte[]` `hexBinaryToOctets(HexBinaryValue in)` Convert a hexBinary value to a sequence of integers representing the octets contained in the value
`static SequenceValue` `highest(SequenceIterator nsv)` Get the node with maximum numeric value of the string-value of each of a set of nodes
`static SequenceIterator` `highest(XPathContext context, SequenceIterator nsv, Evaluate.PreparedExpression pexpression)` Get the maximum numeric value of a stored expression over a set of nodes
`static SequenceIterator` `leading(XPathContext context, SequenceIterator in, Evaluate.PreparedExpression pexp)` Get the items that satisfy the given expression, up to and excluding the first one (in sequence order) that doesn't
`static int` `lineNumber(XPathContext c)` Return the line number of the context node.
`static SequenceValue` `lowest(SequenceIterator nsv)` Get the node with minimum numeric value of the string-value of each of a set of nodes
`static SequenceIterator` `lowest(XPathContext context, SequenceIterator nsv, Evaluate.PreparedExpression pexpression)` Get the node with minimum numeric value of a stored expression over a set of nodes
`static double` `max(XPathContext context, SequenceIterator nsv, Evaluate.PreparedExpression pexpression)` Get the maximum numeric value of a stored expression over a set of nodes
`static double` `min(XPathContext context, SequenceIterator nsv, Evaluate.PreparedExpression pexpression)` Get the minimum numeric value of a stored expression over a set of nodes
`static NodeInfo` `namespaceNode(XPathContext context, java.lang.String prefix, java.lang.String uri)` Create a parentless namespace node.
`static Base64BinaryValue` `octetsToBase64Binary(byte[] in)` Convert a sequence of integers in the range 0-255, representing a sequence of octets, to a base64Binary value
`static HexBinaryValue` `octetsToHexBinary(byte[] in)` Convert a sequence of integers in the range 0-255, representing a sequence of octets, to a hexBinary value
`static java.lang.String` `path(XPathContext c)` Return an XPath expression that identifies the current node
`static void` `pauseTracing(XPathContext c)` Switch tracing off.
`static void` `resumeTracing(XPathContext c)` Resume tracing.
`static java.util.List` `stringToUtf8(java.lang.String in)` Get the UTF-8 encoding of a string
`static double` `sum(XPathContext context, SequenceIterator nsv, Evaluate.PreparedExpression pexpression)` Total a stored expression over a set of nodes
`static java.lang.String` `systemId(XPathContext c)` Return the system identifier of the context node
`static SequenceIterator` `tokenize(java.lang.String s)` Return a node-set by tokenizing a supplied string.
`static SequenceIterator` `tokenize(java.lang.String s, java.lang.String delim)` Return a sequence by tokenizing a supplied string.
`static java.lang.String` `typeAnnotation(XPathContext context, NodeInfo node)` Display the value of the type annotation of a node
`static MonthDurationValue` `yearMonthDurationFromMonths(double arg)` Get a yearMonthDuration value corresponding to a given number of months

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Method Detail

### pauseTracing

    public static void pauseTracing(XPathContext c)

  Switch tracing off. Only works if tracing is enabled.

### resumeTracing

    public static void resumeTracing(XPathContext c)

  Resume tracing. Only works if tracing was originally enabled but is currently paused.

### systemId

    public static java.lang.String systemId(XPathContext c)
                                     throws XPathException

  Return the system identifier of the context node

    `XPathException`

### lineNumber

    public static int lineNumber(XPathContext c)

  Return the line number of the context node.

### discardDocument

    public static DocumentInfo discardDocument(XPathContext context,
                                               DocumentInfo doc)

  Remove a document from the document pool. The effect is that the document becomes eligible for garbage collection, allowing memory to be released when processing of the document has finished. The downside is that a subsequent call on document() with the same URI causes the document to be reloaded and reparsed, and the new nodes will have different node identity from the old.

  Parameters:
    `context` - the evaluation context (supplied implicitly by the call mechanism)
    `doc` - the document to be released from the document pool
  Returns:
    the document that was released. This allows a call such as select="saxon:discard-document(document('a.xml'))"

### hasSameNodes

    public static boolean hasSameNodes(SequenceIterator p1,
                                       SequenceIterator p2)
                                throws XPathException

  Determine whether two node-sets contain the same nodes

  Parameters:
    `p1` - The first node-set. The iterator must be correctly ordered.
    `p2` - The second node-set. The iterator must be correctly ordered.
  Returns:
    true if p1 and p2 contain the same set of nodes
    `XPathException`

### sum

    public static double sum(XPathContext context,
                             SequenceIterator nsv,
                             Evaluate.PreparedExpression pexpression)
                      throws XPathException

  Total a stored expression over a set of nodes

    `XPathException`

### max

    public static double max(XPathContext context,
                             SequenceIterator nsv,
                             Evaluate.PreparedExpression pexpression)
                      throws XPathException

  Get the maximum numeric value of a stored expression over a set of nodes

    `XPathException`

### min

    public static double min(XPathContext context,
                             SequenceIterator nsv,
                             Evaluate.PreparedExpression pexpression)
                      throws XPathException

  Get the minimum numeric value of a stored expression over a set of nodes

    `XPathException`

### highest

    public static SequenceValue highest(SequenceIterator nsv)
                                 throws XPathException

  Get the node with maximum numeric value of the string-value of each of a set of nodes

    `XPathException`

### highest

    public static SequenceIterator highest(XPathContext context,
                                           SequenceIterator nsv,
                                           Evaluate.PreparedExpression pexpression)
                                    throws XPathException

  Get the maximum numeric value of a stored expression over a set of nodes

    `XPathException`

### lowest

    public static SequenceValue lowest(SequenceIterator nsv)
                                throws XPathException

  Get the node with minimum numeric value of the string-value of each of a set of nodes

    `XPathException`

### lowest

    public static SequenceIterator lowest(XPathContext context,
                                          SequenceIterator nsv,
                                          Evaluate.PreparedExpression pexpression)
                                   throws XPathException

  Get the node with minimum numeric value of a stored expression over a set of nodes

    `XPathException`

### distinct

    public static SequenceIterator distinct(XPathContext context,
                                            SequenceIterator in,
                                            Evaluate.PreparedExpression pexp)

  Given a node-set, return a subset that includes only nodes with distinct string-values for the supplied expression

### leading

    public static SequenceIterator leading(XPathContext context,
                                           SequenceIterator in,
                                           Evaluate.PreparedExpression pexp)
                                    throws XPathException

  Get the items that satisfy the given expression, up to and excluding the first one (in sequence order) that doesn't

    `XPathException`

### after

    public static SequenceIterator after(XPathContext context,
                                         SequenceIterator ns1,
                                         SequenceIterator ns2)
                                  throws XPathException

  Find all the nodes in ns1 that are after the first node in ns2. Return ns1 if ns2 is empty,

    `XPathException`

### tokenize

    public static SequenceIterator tokenize(java.lang.String s)

  Return a node-set by tokenizing a supplied string. Tokens are delimited by any sequence of whitespace characters.

### tokenize

    public static SequenceIterator tokenize(java.lang.String s,
                                            java.lang.String delim)

  Return a sequence by tokenizing a supplied string. The argument delim is a String, any character in this string is considered to be a delimiter character, and any sequence of delimiter characters acts as a separator between tokens.

### path

    public static java.lang.String path(XPathContext c)
                                 throws XPathException

  Return an XPath expression that identifies the current node

    `XPathException`

### typeAnnotation

    public static java.lang.String typeAnnotation(XPathContext context,
                                                  NodeInfo node)

  Display the value of the type annotation of a node

### getContext

    public static XPathContext getContext(XPathContext c)

  Return the XPathContext object

### getPseudoAttribute

    public static java.lang.String getPseudoAttribute(XPathContext c,
                                                      java.lang.String name)
                                               throws XPathException

  Get a pseudo-attribute of a processing instruction. Return an empty string if the pseudo-attribute is not present. Character references and built-in entity references are expanded

    `XPathException`

### dayTimeDurationFromSeconds

    public static SecondsDurationValue dayTimeDurationFromSeconds(double arg)
                                                           throws XPathException

  Get a dayTimeDuration value corresponding to a given number of seconds

    `XPathException`

### yearMonthDurationFromMonths

    public static MonthDurationValue yearMonthDurationFromMonths(double arg)

  Get a yearMonthDuration value corresponding to a given number of months

### decimalDivide

    public static java.math.BigDecimal decimalDivide(java.math.BigDecimal arg1,
                                                     java.math.BigDecimal arg2,
                                                     int scale)

  Perform decimal division to a user-specified precision

### stringToUtf8

    public static java.util.List stringToUtf8(java.lang.String in)

  Get the UTF-8 encoding of a string

  Parameters:
    `in` - the supplied string
  Returns:
    a sequence of integers, each in the range 0-255, representing the octets of the UTF-8 encoding of the given string

### octetsToBase64Binary

    public static Base64BinaryValue octetsToBase64Binary(byte[] in)

  Convert a sequence of integers in the range 0-255, representing a sequence of octets, to a base64Binary value

### octetsToHexBinary

    public static HexBinaryValue octetsToHexBinary(byte[] in)

  Convert a sequence of integers in the range 0-255, representing a sequence of octets, to a hexBinary value

### base64BinaryToOctets

    public static byte[] base64BinaryToOctets(Base64BinaryValue in)

  Convert a base64Binary value to a sequence of integers representing the octets contained in the value

### hexBinaryToOctets

    public static byte[] hexBinaryToOctets(HexBinaryValue in)

  Convert a hexBinary value to a sequence of integers representing the octets contained in the value

### namespaceNode

    public static NodeInfo namespaceNode(XPathContext context,
                                         java.lang.String prefix,
                                         java.lang.String uri)
                                  throws XPathException

  Create a parentless namespace node. This function is useful in XQuery when namespaces need to be created dynamically. The effect is the same as that of the xsl:namespace instruction in XSLT.

    `XPathException`