## 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 java.lang.String` `base64BinaryToString(XPathContext context, Base64BinaryValue in, java.lang.String encoding)` Convert a base64Binary value to a String, assuming a particular encoding
`static int` `columnNumber(NodeInfo node)` Return the column number of the specified node.
`static int` `columnNumber(XPathContext c)` Return the column number of the context node.
`static XQueryExpression` `compileQuery(XPathContext context, java.lang.String query)` Compile a string containing a source query transformations
`static javax.xml.transform.Templates` `compileStylesheet(XPathContext context, DocumentInfo doc)` Compile a document containing a stylesheet module into a stylesheet that can be used to perform transformations
`static java.math.BigDecimal` `decimalDivide(java.math.BigDecimal arg1, java.math.BigDecimal arg2, int scale)` Perform decimal division to a user-specified precision
`static boolean` `deepEqual(XPathContext context, SequenceIterator arg1, SequenceIterator arg2, java.lang.String collation, java.lang.String flags)` Perform a parameterized deep-equals() test
`static DocumentInfo` `discardDocument(XPathContext context, DocumentInfo doc)` Remove a document from the document pool.
`static DateTimeValue` `fileLastModified(XPathContext context, java.lang.String fileURI)` This function determines the file modification time.
`static java.lang.String` `generateId(NodeInfo node)` The function saxon:generate-id() is equivalent to the standard XSLT function generate-id().
`static Configuration` `getConfiguration(XPathContext c)` Return the Configuration object
`static XPathContext` `getContext(XPathContext c)` Return the XPathContext object
`static Controller` `getController(XPathContext c)` Return the Controller 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 java.lang.String` `hexBinaryToString(XPathContext context, HexBinaryValue in, java.lang.String encoding)` Convert a hexBinary value to a String, assuming a particular encoding
`static Value` `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 BooleanValue` `inSummerTime(XPathContext context, DateTimeValue date, java.lang.String region)` Determine whether a given date/time is in summer time (daylight savings time) in a given region.
`static DateTimeValue` `lastModified(XPathContext c)` This function implements the `last-modified()` function without any argument.
`static DateTimeValue` `lastModified(XPathContext context, NodeInfo node)` This function implements the `last-modified(node)` function with one argument which must be a node.
`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 satisfy the expression.
`static int` `lineNumber(NodeInfo node)` Return the line number of the specified node.
`static int` `lineNumber(XPathContext c)` Return the line number of the context node.
`static Value` `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 the string-value of each of 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(NodeInfo node)` Return an XPath expression that identifies a specified node
`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 java.lang.String` `printStack(XPathContext c)` Return a string containing a diagnostic print of the current execution stack
`static SequenceIterator` `query(XPathContext context, XQueryExpression query)` Run a previously-compiled query.
`static SequenceIterator` `query(XPathContext context, XQueryExpression query, Item source)` Run a previously-compiled query
`static SequenceIterator` `query(XPathContext context, XQueryExpression query, Item source, SequenceIterator params)` Run a previously-compiled query, supplying parameters to the transformation.
`static void` `resumeTracing(XPathContext c)` Resume tracing.
`static SequenceIterator` `sort(XPathContext context, SequenceIterator input)` Sort a sequence of nodes or atomic values, using the atomic value itself, or the atomized value of the node, as the sort key.
`static SequenceIterator` `sort(XPathContext context, SequenceIterator input, Evaluate.PreparedExpression sortKeyExpression)` Sort a sequence of nodes or atomic values, using a given expression to calculate the sort key.
`static Base64BinaryValue` `stringToBase64Binary(java.lang.String in, java.lang.String encoding)` Convert a string to a base64Binary value in a given encoding
`static HexBinaryValue` `stringToHexBinary(java.lang.String in, java.lang.String encoding)` Convert a string to a hexBinary value in a given encoding
`static java.util.List` `stringToUtf8(java.lang.String in)` Get the UTF-8 encoding of a string
`static java.lang.String` `systemId(XPathContext c)` Return the system identifier of the context node
`static DocumentInfo` `transform(XPathContext context, javax.xml.transform.Templates templates, NodeInfo source)` Run a transformation to convert an input tree to an output document
`static DocumentInfo` `transform(XPathContext context, javax.xml.transform.Templates templates, NodeInfo source, SequenceIterator params)` Run a transformation to convert an input tree to an output document, supplying parameters to the transformation.
`static QNameValue` `typeAnnotation(XPathContext context, Item item)` Display the value of the type annotation of a node or an atomic value
`static java.lang.String[]` `unparsedEntities(DocumentInfo doc)` Get a list of the names of the unparsed entities in a document
`static boolean` `validCharacter(XPathContext c, int in)` Test whether a given integer is the codepoint of a valid XML character

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 was enabled at compile time.

  Parameters:
    `c` - the XPath dynamic context

### resumeTracing

    public static void resumeTracing(XPathContext c)

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

  Parameters:
    `c` - the XPath dynamic context

### systemId

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

  Return the system identifier of the context node

  Parameters:
    `c` - the XPath dynamic context
  Returns:
    the system ID
  Throws:
    `XPathException`

### generateId

    public static java.lang.String generateId(NodeInfo node)

  The function saxon:generate-id() is equivalent to the standard XSLT function generate-id(). It is provided as an extension function to make it available in non-XSLT environments, for example in XQuery.

  Parameters:
    `node` - the node whose identifier is required
  Returns:
    as ASCII alphanumeric string that uniquely identifies this node

### lineNumber

    public static int lineNumber(XPathContext c)

  Return the line number of the context node.

  Parameters:
    `c` - the XPath dynamic context
  Returns:
    the line number, or -1 if not available

### lineNumber

    public static int lineNumber(NodeInfo node)

  Return the line number of the specified node.

  Parameters:
    `node` - the node whose line number is required
  Returns:
    the line number of the node. This is only available if line numbering was switched on.

### columnNumber

    public static int columnNumber(XPathContext c)

  Return the column number of the context node. This is only available if line numbering has been enabled for the containing tree

  Parameters:
    `c` - the XPath dynamic context
  Returns:
    the column number, or -1 if not available

### columnNumber

    public static int columnNumber(NodeInfo node)

  Return the column number of the specified node.

  Parameters:
    `node` - the node whose column number is required
  Returns:
    the column number of the node. This is only available if line numbering was switched on.

### 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
  Throws:
    `XPathException`

### sort

    public static SequenceIterator sort(XPathContext context,
                                        SequenceIterator input)

  Sort a sequence of nodes or atomic values, using the atomic value itself, or the atomized value of the node, as the sort key. The values must all be comparable. Strings are compared using codepoint collation. When nodes are atomized, the result must not be a sequence containing more than one item.

  Parameters:
    `context` - the XPath dynamic context
    `input` - the sequence to be sorted
  Returns:
    an iterator over the sorted sequence

### sort

    public static SequenceIterator sort(XPathContext context,
                                        SequenceIterator input,
                                        Evaluate.PreparedExpression sortKeyExpression)

  Sort a sequence of nodes or atomic values, using a given expression to calculate the sort key. as the sort key. The values must all be comparable. Strings are compared using codepoint collation. When nodes are atomized, the result must not be a sequence containing more than one item.

  Parameters:
    `context` - the XPath dynamic context
    `input` - the sequence to be sorted
    `sortKeyExpression` - the expression used to compute the sort keys
  Returns:
    an iterator over the sorted sequence

### highest

    public static Value highest(SequenceIterator nsv)
                         throws XPathException

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

  Parameters:
    `nsv` - the input sequence
  Returns:
    the node with the maximum numeric value
  Throws:
    `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

  Parameters:
    `context` - the XPath dynamic evaluation context
    `nsv` - the input sequence
    `pexpression` - the expression whose maximum is to be computed
  Returns:
    an iterator over the items in the input sequence for which the expression takes its maximum value
  Throws:
    `XPathException`

### lowest

    public static Value lowest(SequenceIterator nsv)
                        throws XPathException

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

  Parameters:
    `nsv` - the input sequence
  Returns:
    the node with the minimum numeric value
  Throws:
    `XPathException`

### lowest

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

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

  Parameters:
    `context` - the XPath dynamic evaluation context
    `nsv` - the input sequence
    `pexpression` - the expression whose minimum is to be computed
  Returns:
    an iterator over the items in the input sequence for which the expression takes its minimum value
  Throws:
    `XPathException`

### leading

    public 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 satisfy the expression.

  Parameters:
    `context` - the XPath dynamic evaluation context
    `in` - the input sequence
    `pexp` - the expression against which items are to be tested
  Returns:
    an iterator over the items in the input sequence up to and excluding the first one that doesn't satisfy the expression

### 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,

  Parameters:
    `context` - the dynamic evaluation context
    `ns1` - the first operand
    `ns2` - the second operand
  Returns:
    an iterator over the nodes in ns1 that are after the first node in ns2
  Throws:
    `XPathException`

### path

    public static java.lang.String path(NodeInfo node)
                                 throws XPathException

  Return an XPath expression that identifies a specified node

  Parameters:
    `node` - the node whose path is required
  Returns:
    a path expression giving a path from the root of the tree to the specified node
  Throws:
    `XPathException`

### path

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

  Return an XPath expression that identifies the current node

  Parameters:
    `c` - the XPath dynamic context
  Returns:
    a path expression giving a path from the root of the tree to the context node
  Throws:
    `XPathException`

### typeAnnotation

    public static QNameValue typeAnnotation(XPathContext context,
                                            Item item)

  Display the value of the type annotation of a node or an atomic value

  Parameters:
    `context` - the XPath dynamic context
    `item` - the node or atomic value whose type annotation is required
  Returns:
    the type annotation or type label as a QName

### getContext

    public static XPathContext getContext(XPathContext c)

  Return the XPathContext object

  Parameters:
    `c` - the context object
  Returns:
    the context object (this looks crazy, but it works given that the function is called from an XPath environment where the context is supplied as an implicit argument)

### getController

    public static Controller getController(XPathContext c)

  Return the Controller object

  Parameters:
    `c` - the XPath dynamic context
  Returns:
    the Controller

### getConfiguration

    public static Configuration getConfiguration(XPathContext c)

  Return the Configuration object

  Parameters:
    `c` - the XPath dynamic context
  Returns:
    the Saxon configuration

### printStack

    public static java.lang.String printStack(XPathContext c)

  Return a string containing a diagnostic print of the current execution stack

  Parameters:
    `c` - the XPath dynamic context
  Returns:
    a diagnostic stack print

### 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

  Parameters:
    `c` - the XPath dynamic context. The context item should be a processing instruction, though it doesn't matter if it isn't: the function will look at the string-value of the context item whatever it is.
    `name` - the name of the required pseudo-attribute
  Returns:
    the value of the pseudo-attribute if it is present
  Throws:
    `XPathException`

### 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

  Parameters:
    `arg1` - the numerator
    `arg2` - the denominator
    `scale` - the required number of digits in the result of the division
  Returns:
    the result of the division

### 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

  Parameters:
    `in` - the input array of bytes (octets)
  Returns:
    the corresponding 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

  Parameters:
    `in` - the input array of bytes (octets)
  Returns:
    the corresponding 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

  Parameters:
    `in` - the supplied base64Binary value
  Returns:
    the corresponding array of integers, representing the octet values

### hexBinaryToOctets

    public static byte[] hexBinaryToOctets(HexBinaryValue in)

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

  Parameters:
    `in` - the input hexBinary value
  Returns:
    the corresponding array of integers, representing the octet values

### base64BinaryToString

    public static java.lang.String base64BinaryToString(XPathContext context,
                                                        Base64BinaryValue in,
                                                        java.lang.String encoding)
                                                 throws java.lang.Exception

  Convert a base64Binary value to a String, assuming a particular encoding

  Parameters:
    `context` - the XPath dynamic context
    `in` - the supplied base64Binary value
    `encoding` - the character encoding
  Returns:
    the string that results from treating the base64binary value as a sequence of octets that encode a string in the given encoding
  Throws:
    `java.lang.Exception`

### stringToBase64Binary

    public static Base64BinaryValue stringToBase64Binary(java.lang.String in,
                                                         java.lang.String encoding)
                                                  throws java.io.IOException

  Convert a string to a base64Binary value in a given encoding

  Parameters:
    `in` - the input string
    `encoding` - the desired encoding
  Returns:
    the base64Binary value that results from encoding the string as a sequence of octets in the given encoding.
  Throws:
    `java.io.IOException`

### hexBinaryToString

    public static java.lang.String hexBinaryToString(XPathContext context,
                                                     HexBinaryValue in,
                                                     java.lang.String encoding)
                                              throws java.lang.Exception

  Convert a hexBinary value to a String, assuming a particular encoding

  Parameters:
    `context` - the XPath dynamic context
    `in` - the supplied hexBinary value
    `encoding` - the character encoding
  Returns:
    the string that results from treating the hexBinary value as a sequence of octets that encode a string in the given encoding
  Throws:
    `java.lang.Exception`

### stringToHexBinary

    public static HexBinaryValue stringToHexBinary(java.lang.String in,
                                                   java.lang.String encoding)
                                            throws java.lang.Exception

  Convert a string to a hexBinary value in a given encoding

  Parameters:
    `in` - the input string
    `encoding` - the desired encoding
  Returns:
    the hexBinary value that results from encoding the string as a sequence of octets in the given encoding.
  Throws:
    `java.lang.Exception`

### validCharacter

    public static boolean validCharacter(XPathContext c,
                                         int in)

  Test whether a given integer is the codepoint of a valid XML character

  Parameters:
    `c` - the XPath dynamic context
    `in` - the character to be tested
  Returns:
    true if and only if the character is valid in (the relevant version of) XML

### 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.

  Parameters:
    `context` - the dynamic evaluation context
    `prefix` - the name of the namespace node
    `uri` - the string value of the namespace node
  Returns:
    the newly constructed namespace node
  Throws:
    `XPathException`

### unparsedEntities

    public static java.lang.String[] unparsedEntities(DocumentInfo doc)
                                               throws XPathException

  Get a list of the names of the unparsed entities in a document

  Parameters:
    `doc` - the document node of the document whose unparsed entities are required
  Returns:
    an iterator over a sequence of strings containing the names of the unparsed entities
  Throws:
    `XPathException`

### deepEqual

    public static boolean deepEqual(XPathContext context,
                                    SequenceIterator arg1,
                                    SequenceIterator arg2,
                                    java.lang.String collation,
                                    java.lang.String flags)
                             throws XPathException

  Perform a parameterized deep-equals() test

  Parameters:
    `context` - The evaluation context
    `arg1` - The first sequence to be compared
    `arg2` - The second sequence to be compared
    `collation` - The collation to be used (null if the default collation is to be used)
    `flags` - A string whose characters select options that cause the comparison to vary from the standard fn:deep-equals() function. The flags are:
    - N - take namespace nodes into account
    - J - join adjacent text nodes (e.g, nodes either side of a comment)
    - A - compare type annotations
    - C - take comments into account
    - F - take namespace prefixes into account
    - P - take processing instructions into account
    - S - compare string values, not typed values
    - w - don't take whitespace-only text nodes into account
  Returns:
    true if the sequences are deep equal, otherwise false
  Throws:
    `XPathException`

### lastModified

    public static DateTimeValue lastModified(XPathContext c)
                                      throws XPathException

  This function implements the `last-modified()` function without any argument. It returns the modification time of the file containing the context node.

  Parameters:
    `c` - the dynamic evaluation context supplied by Saxon
  Returns:
    file modification time as an xs:dateTime value, or an empty sequence if the context item is not a node or if the context node is not present in a local file
  Throws:
    `XPathException` - XPath dynamic error reported back to Saxon

### lastModified

    public static DateTimeValue lastModified(XPathContext context,
                                             NodeInfo node)
                                      throws XPathException

  This function implements the `last-modified(node)` function with one argument which must be a node. It returns the modification time of the file containing the context node.

  Parameters:
    `node` - the node supplied by a user
  Returns:
    file modification time as an xs:dateTime value, or an empty sequence if the supplied node is not present in a local file
  Throws:
    `XPathException` - if an error occurs and the configuration option TRACE_EXTERNAL_FUNCTIONS is true

### fileLastModified

    public static DateTimeValue fileLastModified(XPathContext context,
                                                 java.lang.String fileURI)
                                          throws XPathException

  This function determines the file modification time. It can be called from the stylesheet as file-timestamp(fn).

  Parameters:
    `context` - the XPath dynamic evaluation context
    `fileURI` - the URI of a file. This must be an absolute URI to which Saxon can connect
  Returns:
    file modification time as an xs:dateTime value or an empty sequence if the file is not found
  Throws:
    `XPathException` - if an error occurs and the configuration option TRACE_EXTERNAL_FUNCTIONS is true

### inSummerTime

    public static BooleanValue inSummerTime(XPathContext context,
                                            DateTimeValue date,
                                            java.lang.String region)

  Determine whether a given date/time is in summer time (daylight savings time) in a given region. This relies on the Java database of changes to daylight savings time. Since summer time changes are set by civil authorities the information is not necessarily reliable when applied to dates in the future.

  Parameters:
    `context` - used to get the implicit timezone in the event that the supplied date/time has no timezone
    `date` - the date/time in question. This should preferably include a timezone.
    `region` - either the two-letter ISO country code, or an Olsen timezone name such as "America/New_York" or "Europe/Lisbon". If the country code denotes a country spanning several timezones, such as the US, then one of them is chosen arbitrarily.
  Returns:
    true if the date/time is known to be in summer time in the relevant country; false if it is known not to be in summer time; null if there is no timezone or if no information is available.

### compileStylesheet

    public static javax.xml.transform.Templates compileStylesheet(XPathContext context,
                                                                  DocumentInfo doc)
                                                           throws XPathException

  Compile a document containing a stylesheet module into a stylesheet that can be used to perform transformations

  Parameters:
    `context` - the XPath dynamic evaluation context
    `doc` - the document containing the stylesheet to be compiled
  Returns:
    the compiled stylesheet
  Throws:
    `XPathException`

### transform

    public static DocumentInfo transform(XPathContext context,
                                         javax.xml.transform.Templates templates,
                                         NodeInfo source)
                                  throws XPathException

  Run a transformation to convert an input tree to an output document

  Parameters:
    `context` - The dynamic context
    `templates` - The compiled stylesheet
    `source` - The initial context node representing the document to be transformed
  Returns:
    the document that results from the transformation
  Throws:
    `XPathException`

### transform

    public static DocumentInfo transform(XPathContext context,
                                         javax.xml.transform.Templates templates,
                                         NodeInfo source,
                                         SequenceIterator params)
                                  throws XPathException

  Run a transformation to convert an input tree to an output document, supplying parameters to the transformation.

  Parameters:
    `context` - The dynamic context
    `templates` - The compiled stylesheet
    `source` - The initial context node representing the document to be transformed
    `params` - A sequence of nodes (typically element nodes) supplying values of parameters. The name of the node should match the name of the parameter, the typed value of the node is used as the value of the parameter.
  Returns:
    the document that results from the transformation
  Throws:
    `XPathException`

### compileQuery

    public static XQueryExpression compileQuery(XPathContext context,
                                                java.lang.String query)
                                         throws XPathException

  Compile a string containing a source query transformations

  Parameters:
    `context` - the XPath dynamic evaluation context
    `query` - a string containing the query to be compiled
  Returns:
    the compiled query
  Throws:
    `XPathException`

### query

    public static SequenceIterator query(XPathContext context,
                                         XQueryExpression query)
                                  throws XPathException

  Run a previously-compiled query. The initial context item for the query is taken from the context in which the query is called (if there is one); no parameters are supplied

  Parameters:
    `context` - The dynamic context
    `query` - The compiled query
  Returns:
    the sequence representing the result of the query
  Throws:
    `XPathException`

### query

    public static SequenceIterator query(XPathContext context,
                                         XQueryExpression query,
                                         Item source)
                                  throws XPathException

  Run a previously-compiled query

  Parameters:
    `context` - The dynamic context
    `query` - The compiled query
    `source` - The initial context item for the query (may be null)
  Returns:
    the sequence representing the result of the query
  Throws:
    `XPathException`

### query

    public static SequenceIterator query(XPathContext context,
                                         XQueryExpression query,
                                         Item source,
                                         SequenceIterator params)
                                  throws XPathException

  Run a previously-compiled query, supplying parameters to the transformation.

  Parameters:
    `context` - The dynamic context
    `query` - The compiled query
    `source` - The initial context node for the query (may be null)
    `params` - A sequence of nodes (typically element nodes) supplying values of parameters. The name of the node should match the name of the parameter, the typed value of the node is used as the value of the parameter.
  Returns:
    the results of the query (a sequence of items)
  Throws:
    `XPathException`

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