Class FeatureKeys

ALLOW_EXTERNAL_FUNCTIONS

Not applicable to SaxonCS

ALLOW_MULTITHREADING

ALLOW_MULTITHREADING determines whether multi-threading is allowed.

If true (the default), the presence of the attribute saxon:threads="N" on an xsl:for-each instruction, when running under Saxon-EE, causes multi-threaded execution. If set to false, the value of the saxon:threads argument is ignored.

Setting the value to false also disables asynchronous processing of xsl:result-document instructions.

The default value is true if Saxon-EE is in use, false otherwise.

ALLOW_OLD_JAVA_URI_FORMAT

Not applicable to SaxonCS

ALLOW_SYNTAX_EXTENSIONS

This flag must be set to enable use of extensions to XPath, XQuery and XSLT syntax that go beyond what is allowed by the extensibility mechanisms in the spec. In some cases these extensions are experimental and may not be carried forward to future Saxon releases.

Syntax extensions in Saxon 10 include the use of type aliases (type(...) where an item type is expected, and declare type NAME = item-type in the XQuery Prolog); and simple inline functions (for example .{. + 1}).

ALLOW_UNRESOLVED_SCHEMA_COMPONENTS

The W3C XSD specification (both 1.0 and 1.1) states that an unresolved reference to an absent schema component does not automatically make the schema invalid; the schema should be usable for validation provided that the missing components are not actually needed in a particular validation episode.

However, the W3C XSD conformance tests treat such an unresolved reference as an error; the test is expected to report the schema as invalid. And this is the way most schema processors actually operate, and probably what most users would expect.

By default, the Saxon schema processor reports an unresolved reference as an error in the schema.

If this option is set, then Saxon attempts to repair the schema so that it is usable for validation, by substituting the missing components with default components: for example if an attribute declaration refers to a type that has not been defined, then xs:error is substituted, making any instance of the attribute invalid.

ALLOWED_PROTOCOLS

Not applicable to SaxonCS

ASSERTIONS_CAN_SEE_COMMENTS

ASSERTIONS_CAN_SEE_COMMENTS determines whether comment and processing instructions in a document being validated are visible to assertions in an XSD 1.1 schema.

If the value is false (the default), comments and processing instructions are stripped from the view of the document that is made visible to the XPath expression that implements the assertion. If this creates adjacent text nodes, they are collapsed into a single text node.

If the value is true, then comments and processing instructions are visible to the XPath assertion.

COLLATION_URI_RESOLVER

The supplied CollationURIResolver is used to process any collation URIs found in the query or stylesheet, returning an object of class net.sf.saxon.lib.StringCollator that implements the requested collation.

COLLATION_URI_RESOLVER_CLASS

Not applicable to SaxonCS

COLLECTION_FINDER

Not applicable to SaxonCS

COLLECTION_FINDER_CLASS

Not applicable to SaxonCS

COMPILE_WITH_TRACING

If run-time tracing of stylesheet or query execution is required, then the code must be compiled with tracing enabled.

Default is false. This option causes code to be compiled that makes calls to a net.sf.saxon.lib.TraceListener, but this has no effect unless a TraceListener is registered at execution time.

CONFIGURATION

This attribute cannot be set on the net.sf.saxon.Configuration itself, but it can be set on various JAXP factory objects such as a TransformerFactory or DocumentBuilderFactory, to ensure that several such factories use the same Configuration.

Note that other configuration options are held in the Configuration object, so setting this attribute will cancel all others that have been set. Also, if two factories share the same Configuration, then setting an attribute on one affects all the others.

CONFIGURATION_FILE

Defines a configuration file to be applied to the configuration.

This attribute cannot be set on the net.sf.saxon.Configuration itself, but it can be set on various JAXP factory objects such as a TransformerFactory or DocumentBuilderFactory. It is particularly useful when running transformations via the Ant xslt task, where it can be set as follows to define all configuration settings:

<factory name="net.sf.saxon.TransformerFactoryImpl"> <attribute name="http://saxon.sf.net/feature/configuration-file" value="c:/saxon/config.xml"/> </factory>

DEBUG_BYTE_CODE

Not applicable to SaxonCS

DEBUG_BYTE_CODE_DIR

Not applicable to SaxonCS

DEFAULT_COLLATION

This option determines the collation that is used for comparing strings when no explicit collation is requested. It is not necessary for this collation to exist (or to have been registered) when setting this option; it only needs to exist by the time it is used.

In XSLT it is possible to override this setting using the [xsl:]default-collation attribute on any stylesheet element. In XQuery, it can be overridden using the declare default collation declaration in the query prolog, or via a setter method in class net.sf.saxon.query.StaticQueryContext.

If no value is specified, the Unicode codepoint collation is used.

DEFAULT_COLLECTION

This determines the collection that is used when the fn:collection() function is called with no arguments; the effect is the same as if it were called passing the URI that is the value of this configuration property.

DEFAULT_COUNTRY

This determines the country that is used by format-date() and similar functions if no country code is supplied explicitly. If no value is given for this property, the default is taken from the Java Locale, which in turn typically depends on settings for the current user in the operating system.

DEFAULT_LANGUAGE

This option determines the language that is used by format-date(), xsl:number and similar constructs if no language code is supplied explicitly. If no value is given for this property, the default is taken from the Java Locale, which in turn typically depends on settings for the current user in the operating system.

DEFAULT_REGEX_ENGINE

Not applicable to SaxonCS

DISABLE_XSL_EVALUATE

This option disables the xsl:evaluate instruction.

If set at stylesheet compile time, the feature is statically disabled. If set at run-time it is dynamically disabled. (These terms are defined in the XSLT 3.0 spec.) By default, the feature is enabled.

The XSLT 3.0 specification requires conformant processors to provide a way of disabling xsl:evaluate. This shouldn't be taken as meaning that xsl:evaluate poses particular security risks. The main reason for disabling it is if you want to carry out static analysis or inspection of stylesheet code to see what features it uses. But if you're doing such inspection, it's not difficult to check that xsl:evaluate is only being used to execute trusted code. Note also that fn:transform() can similarly be used to execute dynamically-constructed code, and there is no switch to disable that function.

DISPLAY_BYTE_CODE

Not applicable to SaxonCS

DTD_VALIDATION

If true, the XML parser is requested to perform validation of source documents against their DTD. Default is false.

This option establishes a default for use whenever source documents (not stylesheets or schema documents) are parsed. The option can be overridden for individual documents by setting the net.sf.saxon.lib.ParseOptions for that individual document, for example from a URIResolver.

DTD_VALIDATION_RECOVERABLE

Not applicable to SaxonCS

EAGER_EVALUATION

Forces Saxon to do eager evaluation of expressions in contexts where normally it would do lazy evaluation, for example when evaluating variables and function results. This can make for easier debugging.

Note that this only applies to situations where Saxon would normally save a Closure object as the result of an expression. It does not prevent Saxon from using pipelined evaluation of intermediate expressions using iterators.

ENTITY_RESOLVER_CLASS

Not applicable to SaxonCS

ENVIRONMENT_VARIABLE_RESOLVER

Setting the ENVIRONMENT_VARIABLE_RESOLVER causes the supplied object to be registered as the environment variable resolver for the Configuration. The setting is global: it affects all queries and transformations using this configuration.

The environment variable resolver is used when the XPath functions available-environment-variables() or environment-variable() are called. Saxon essentially delegates the evaluation of the function to the external resolver.

ENVIRONMENT_VARIABLE_RESOLVER_CLASS

Not applicable to SaxonCS

ERROR_LISTENER_CLASS

Not applicable to SaxonCS

EXPAND_ATTRIBUTE_DEFAULTS

EXPAND_ATTRIBUTE_DEFAULTS determines whether fixed and default values defined in a schema or DTD will be expanded (both on input and on output documents, if validation is requested).

By default (and for conformance with the specification) validation against a DTD or schema will cause default values defined in the schema or DTD to be inserted into the document. Setting this feature to false suppresses this behavior. In the case of DTD-defined defaults this only works if the XML parser reports whether each attribute was specified in the source or generated by expanding a default value. Not all XML parsers report this information.

EXPATH_FILE_DELETE_TEMPORARY_FILES

Not applicable to SaxonCS

GENERATE_BYTE_CODE

Not applicable to SaxonCS

IGNORE_SAX_SOURCE_PARSER

Not applicable to SaxonCS

IMPLICIT_SCHEMA_IMPORTS

IMPLICIT_SCHEMA_IMPORTS allows reference to schema components without an xs:import for the relevant namespace being present in the containing schema document.

This only works if the referenced components are already present among the schema components known to the configuration, perhaps because they were part of a different schema, or because there are cyclic references within a schema.

This option is not conformant with the XSD specification, which requires explicit xs:import declarations for all cross-namespace component references. However, some "industry-standard" schemas are known to violate this rule, and setting this option allows such schemas to be loaded by Saxon.

LAZY_CONSTRUCTION_MODE

Not applicable to SaxonCS

LICENSE_FILE_LOCATION

LICENSE_FILE_LOCATION holds the filename in which the Saxon license file is held.

This is the full file name, for example c:/saxon/license/license.lic. Setting this property causes Saxon to immediately read the specified file and register the license data, assuming it can be found at this location. The property is not recognized for reading, and it is not recognized for writing except in Saxon-PE and Saxon-EE.

LINE_NUMBERING

Default is false. If true, line and column number information is retained for all source documents. This information is accessible using the saxon:line-number() and saxon:column-number() extension functions.

Note that the information is only as good as the XML parser supplies. SAX parsers generally report the position of an element node using the line and column number of the ">" character that forms the last character of the start tag.

When this option is set, location information attached to a node (system ID, line number, and column number) is retained when the node is copied. This has the side effect that the base URI of a node is also copied, which in some cases runs contrary to the XSLT or XQuery specification.

MARK_DEFAULTED_ATTRIBUTES

Not applicable to SaxonCS

MAX_COMPILED_CLASSES

Not applicable to SaxonCS

MESSAGE_EMITTER_CLASS

Not applicable to SaxonCS

MODULE_URI_RESOLVER

Affects XQuery only. An instance of a user-written class implementing Saxon's net.sf.saxon.lib.ModuleURIResolver interface. This is used to process any URIs used in import module directives in XQuery.

MODULE_URI_RESOLVER_CLASS

Not applicable to SaxonCS

MONITOR_HOT_SPOT_BYTE_CODE

Not applicable to SaxonCS

MULTIPLE_SCHEMA_IMPORTS

Affects schema construction (whether for standalone validation, or in the context of XSLT or XQuery).

If set to true, the schema processor attempts to fetch a schema document appearing in an xs:import directive, whether or not a schema for that namespace has already been loaded, unless the absolute URI formed from the schemaLocation is the same as the absolute URI that was used to load that namespace. If set to false, the schema processor ignores the schemaLocation on an xs:import declaration if schema components for the requested namespace are already available. Note that setting the value to true might cause spurious errors due to like-named schema components being loaded more than once. On the other hand, setting the value to false might result in validation failing because schema components are missing.

Note: Both settings are conformant with the W3C recommendation, which leaves the details implementation-defined. It is possible (and advisable) to write schemas in such a way that this setting makes no difference, by ensuring that all imports for a particular namespace go via a "home" schema document for that namespace, where the home schema document contains xs:include declarations for all the schema documents defining components in that namespace.

NAME_POOL

Indicates that the supplied NamePool should be used as the target (run-time) NamePool by all stylesheets compiled (using newTemplates()) after this call on setAttribute.

Normally a single system-allocated NamePool is used for all stylesheets compiled while the Java VM remains loaded; this attribute allows user control over the allocation of name pools. Note that source trees used as input to a transformation must be built using the same NamePool that is used when the stylesheet is compiled: this will happen automatically if the input to a transformation is supplied as a SAXSource or StreamSource but it is under user control if you build the source tree yourself.

This option can be used to make two Configuration objects share a NamePool even though they differ in other respects.

OCCURRENCE_LIMITS

OCCURRENCE_LIMITS determines the largest values of minOccurs and maxOccurs that can be accommodated when compiling an "expanded" finite state machine to represent an XSD content model grammar.

These limits do not apply in the common cases where the grammar can be implemented using a counting finite-state-machine, but in those cases where this is not possible, any minOccurs value greater than the first integer is reduced to the value of the first integer, and any maxOccurs value greater than the second integer is treated as "unbounded".

Setting these values too high may cause an OutOfMemoryException since the size of the finite state machine constructed by Saxon increases linearly with the values of minOccurs and maxOccurs.

OPTIMIZATION_LEVEL

Allows individual optimizations to be enabled or disabled selectively.

There is a set of single-letter flags identifying particular optimizations:

• c: no longer used
• e: cache regular expressions
• f: inline functions
• g: extract global variables
• j: just-in-time compilation of template rules
• k: create keys
• l: loop lifting
• m: miscellaneous
• n: constant folding
• r: template rule-sets
• s: extract common subexpressions
• v: inline variables
• w: create switch statements
• x: index predicates

A value such as gs runs with only the selected optimizations; -gs runs with the selected optimizations disabled and all others enabled. The value 0 suppresses all optimizations. The default is full optimization; this feature allows optimization to be suppressed in cases where reducing compile time is important, or where optimization gets in the way of debugging, or causes extension functions with side-effects to behave unpredictably. (Note however, that even with no optimization, lazy evaluation may still cause the evaluation order to be not as expected.)

Note that disabling optimizations may prevent streamed execution. This is because there are cases where streamed execution is only possible because the optimizer is able to detect that sorting nodes into document order is unnecessary.

OUTPUT_URI_RESOLVER

Not applicable to SaxonCS

OUTPUT_URI_RESOLVER_CLASS

Not applicable to SaxonCS

PRE_EVALUATE_DOC_FUNCTION

If true, calls on the doc() and document() functions, if their arguments are known at compile time, will be evaluated at compile time, and the resulting document will be stored as part of the Saxon net.sf.saxon.Configuration and shared by all queries and transformations running within that Configuration.

This is useful for reference documents that have stable content and are used by many different queries and transformations. The default is false, which means each query or transformation will reload the document from disk.

In XSLT 3.0 a better way of having external documents pre-loaded at stylesheet compile time is to use the new facility of static global variables.

This feature should not be enabled when stylesheets are exported to a SEF file, since embedded source documents within a SEF file cannot always be accurately reconstructed.

When URIs are pre-evaluated, neither the ResourceResolver associated with the relevant Compiler, nor the relevant run-time ResourceResolver are used to resolve the URI. Only the Configuration-level ResourceResolver is used.

RECOGNIZE_URI_QUERY_PARAMETERS

True if the doc() or document() are to recognize query parameters included in the URI (for example, ?validation=strict). The default is false.

The allowed parameters are: validation=strict|lax|strip to perform schema validation (see Validation of source documents); strip-space=yes|ignorable|no to control whitespace stripping (see Whitespace stripping in source documents); parser=full.class.name to determine the name of the parser (XMLReader) to be used (see Controlling parsing of source documents); and xinclude=yes|no to control whether XInclude processing takes place, assuming the XML parser supports it (see XInclude processing).

RECOVERY_POLICY

At one time this property controlled how recoverable errors were handled (fatal error, warning, or ignored). XSLT 3.0 has eliminated all recoverable errors from the specification, so the property is deprecated from Saxon 10.0.

RECOVERY_POLICY_NAME

At one time this property controlled how recoverable errors were handled (fatal error, warning, or ignored). XSLT 3.0 has eliminated all recoverable errors from the specification, so the property is deprecated from Saxon 10.0.

REGEX_BACKTRACKING_LIMIT

This property sets a limit on the amount of backtracking performed during regular expression evaluation.

The default is 10000000 (ten million) which typically represents an evaluation time of about ten seconds. After this time, evaluation of the regular expression will fail rather than making further attempts to find a match. If this limit is reached, it often suggests that there might be a better way of writing the regular expression. The value can be set to -1 (minus one) to mean "unlimited".

Excessive backtracking is usually caused by nested loops in the regular expression, combined with processing of long input strings. Try to ensure that when nested loops are used, there is an unambiguous condition that causes the inner loop to terminate. For example (/[^/]*)+ is fine (it matches a sequence of path segments separated by / characters), because the presence of / forces the inner loop to terminate. By contrast, (/.*)+ matches the same input, but in many different ways, which could lead to excessive backtracking to no useful purpose.

RESOURCE_RESOLVER

The supplied implementation of ResourceResolver is used to resolve URIs. The default implementation uses XML Catalog files. The Saxon resource resolver is used by the entity resolver, URI resolver, unparsed text resolver, and other resolvers that resolve URIs to resources.

RESOURCE_RESOLVER_CLASS

Not applicable to SaxonCS

RESULT_DOCUMENT_THREADS

Indicates the maximum number of threads to be used for processing xsl:result-document instructions in parallel. If the maximum number of threads are already in use, the xsl:result-document instruction will be executed synchronously within its parent thread.

The default value is initialized to Runtime.getRuntime().availableProcessors() which is intended to represent the number of "processors" (under some definition) available from the hardware.

The limit applies per Configuration. If multiple workloads are running on the same server under separate Saxon Configuration objects, then it may be desirable to lower the limit.

Setting a value of zero or one suppresses multithreading entirely. This can also be achieved (for a specific xsl:result-document instruction) by setting the attribute saxon:asynchronous="no" in the stylesheet. Suppressing multithreading may be desirable in a stylesheet that calls extension functions with side-effects.

RETAIN_DTD_ATTRIBUTE_TYPES

Not applicable to SaxonCS

RETAIN_NODE_FOR_DIAGNOSTICS

By default, Saxon attempts to ensure that the run-time code contains no links to the original source stylesheet tree. This allows the garbage collector to free memory.

If this option is set, then Location objects held in the run-time expression tree may contain a link to an element node in the source stylesheet, enabling a user-written ErrorReporter to produce improved diagnostics. This may be an appropriate setting to use, for example, in an IDE.

This setting can also be useful to get improved location information for compile-time errors in cases where reliable line numbers are not available for the source stylesheet. This might happen, for example, if the source stylesheet is preprocessed before compilation, or if it is retrieved from an XML database.

Links to source nodes are not retained in an exported SEF file, regardless of this setting.

SCHEMA_URI_RESOLVER

The supplied SchemaURIResolver will be used to resolve URIs of schema documents referenced in xsl:import-schema declarations in XSLT, import schema in XQuery, references from one schema document to another using xs:include or xs:import, and references from an instance document to a schema using xsi:schemaLocation.

SCHEMA_URI_RESOLVER_CLASS

Not applicable to SaxonCS

SCHEMA_VALIDATION

Indicates whether and how schema validation should be applied to source documents.

SCHEMA_VALIDATION_MODE

Indicates whether and how schema validation should be applied to source documents.

SERIALIZER_FACTORY_CLASS

Not applicable to SaxonCS

SOURCE_PARSER_CLASS

Not applicable to SaxonCS

SOURCE_RESOLVER_CLASS

Not applicable to SaxonCS

STABLE_COLLECTION_URI

STABLE_COLLECTION_URI, if set, indicates that collections returned by the fn:collection() and fn:uri-collection() functions should be stable, that is, repeated calls on these functions with the same collection URI (within the scope of a single query or transformation) should return identical results.

Setting this option may be expensive because it requires that the entire collection be saved in memory; it is rarely necessary in practice, but is required for strict conformance with the W3C specifications.

It is also possible to indicate that a collection is stable by means of the CollectionFinder API.

STABLE_UNPARSED_TEXT

STABLE_UNPARSED_TEXT, if set, indicates that the results returned by repeated calls of unparsed-text(), unparsed-text-lines(), and unparsed-text-available() are consistent: calling these functions twice during the evaluation of a stylesheet or query will return the same results.

Setting this option may be expensive because it requires that the file contents be saved in memory; it is rarely necessary in practice, but is required for strict conformance with the W3C specifications.

STANDARD_ERROR_OUTPUT_FILE

STANDARD_ERROR_OUTPUT_FILE is the name of a file to which Saxon will redirect output that would otherwise go to the operating system standard error stream (System.err). This is the fallback destination for various tracing and diagnostic output. In some cases a more specific mechanism exists to select the destination for particular kinds of output.

Note that if the Configuration is used in more than one processing thread, the messages from different threads will be interleaved in the output file. A more selective approach is to use a different ErrorListener in different processing threads, and arrange for each ErrorListener to write to its own logging destination.

STREAMABILITY

The STREAMABILITY option can be used to disable streaming.

In earlier Saxon releases a third value "extended" was supported, to enable Saxon streaming extensions. Since nearly all these extensions found their way into the W3C specification, the distinction between "standard" and "extended" became meaningless, so the value "extended" has been dropped.

The value "off" causes Saxon to behave as a non-streaming processor; that is, it does not analyze constructs that are declared streamable, and it processes them as if streaming were not requested. This is the only option available when using a Saxon version or license that does not enable streaming.

The value "standard" is a misnomer. For strict adherence to W3C streamability rules, set the property STRICT_STREAMABILITY. The streamability rules applied by default are (in nearly all cases) identical to the W3C rules, but by default they are applied to the expression tree after type-checking and optimization, which makes some constructs streamable that would not be so otherwise.

Whichever option is chosen, the STREAMING_FALLBACK option can be used to control what happens when code is deemed non-streamable; it provides a choice between throwing a static (compile-time) error, and falling back to a non-streaming implementation.

STREAMING_FALLBACK

If the STREAMING_FALLBACK option is set, then constructs for which streaming is requested (such as templates in a streaming mode, the xsl:source-document instruction with attribute streamable="yes", and streamable accumulators) will be executed in non-streaming mode if the code is not actually streamable. A compile-time warning will always be given when the fallback option is taken.

STRICT_STREAMABILITY

Causes the XSLT processor to verify that constructs that are declared streamable are in fact "guaranteed streamable" according to the W3C rules.

Normally, Saxon performs a variety of simplifications and optimizations on the expression tree before performing streamability analysis. Sometimes these tree rewrites will turn a non-streamable expression into a streamable one. An obvious example is variable inlining: the expression let $x := ./item/price return sum($x) is not streamable, but the rewritten form sum(./item/price) is.

The XSLT 3.0 specification requires conformant streaming processors to have a mode of operation in which the streamability rules are enforced as they appear in the spec, and this option enables this mode.

This analysis is expensive, and should only be used during development when testing stylesheet code for portability. When this mode is enabled, Saxon applies the streamability rules at the earliest possible stage of processing; it then performs its normal type checking and optimization phases, before doing a second stage of streamability analysis to construct a streamed execution plan.

STRIP_WHITESPACE

Indicates whether all whitespace, no whitespace, or whitespace in elements defined in a DTD or schema as having element-only content should be stripped from source documents.

The default is "ignorable". This whitespace stripping is additional to any stripping done as a result of the xsl:strip-space declaration in an XSLT stylesheet.

STYLE_PARSER_CLASS

Not applicable to SaxonCS

SUPPRESS_EVALUATION_EXPIRY_WARNING

This is set to true to suppress the warning otherwise issued by command-line interfaces indicating that an evaluation license is in use and is due to expire in a set number of days.

SUPPRESS_XPATH_WARNINGS

Suppresses all warnings issued by the XPath and XQuery parsers.

Examples of warnings that are suppressed are the warning produced when keywords such as true and return are interpreted as element names.

SUPPRESS_XSLT_NAMESPACE_CHECK

This is set to true to suppress the warning when there is no commonality between the namespaces used in stylesheet match patterns and the namespaces used in the source document.

THRESHOLD_FOR_COMPILING_TYPES

Not applicable to SaxonCS

THRESHOLD_FOR_FUNCTION_INLINING

Saxon-EE performs inlining of user-defined functions that are sufficiently simple: they must not be recursive, and they must be below a certain size. This option defines the size.

The value is (roughly) the number of nodes in the expression tree representing the function body. This includes both explicit subexpressions, and subexpressions added by Saxon itself to perform implicit operations such as type checking or conversion of function arguments. The default value is 100.

THRESHOLD_FOR_HOTSPOT_BYTE_CODE

Not applicable to SaxonCS

TIMING

This is set to true to cause basic timing and tracing information to be output to the standard error output stream.

The name of the feature is poorly chosen, since much of the information that is output has nothing to do with timing, for example the names of output files for xsl:result-document are traced, as are the names of schema documents loaded.

TRACE_EXTERNAL_FUNCTIONS

Not applicable to SaxonCS

TRACE_LISTENER

The TraceListener will be notified of significant events occurring during a query or transformation, for tracing or debugging purposes.

Setting a TraceListener automatically sets the FeatureKeys.COMPILE_WITH_TRACING option.

Avoid this option if more than one transformation or query is running concurrently: use the feature FeatureKeys.TRACE_LISTENER_CLASS instead. Alternatively, it is possible to set a TraceListener for an individual query or transformation.

TRACE_LISTENER_CLASS

Not applicable to SaxonCS

TRACE_LISTENER_OUTPUT_FILE

When trace listening is switched on (for example by using -T on the command line), this file will be supplied to the trace listener to use as the output destination. If the option is not supplied, trace listener output is sent to the standard error stream.

TRACE_OPTIMIZER_DECISIONS

If this option is set, Saxon will output (to the standard error output) detailed information about the rewrites to the expression tree made by the optimizer. This information is mainly useful for internal system debugging, but it is also possible to digest it to analyze the ways in which the expression has been optimized for the purpose of performance analysis and tuning.

TREE_MODEL

Selects an implementation of the Saxon tree model. The default is TINY_TREE.

For running XQuery Update, use the linked tree, because it is the only implementation that is updateable.

TREE_MODEL_NAME

Selects an implementation of the Saxon tree model. The default is tinyTree.

For running XQuery Update, use the linked tree, because it is the only implementation that is updateable.

UNPARSED_TEXT_URI_RESOLVER

The supplied UnparsedTextURIResolver will be used to resolve (dereference) all URIs specifed in calls to the unparsed-text(), unparsed-text-lines(), and unparsed-text-available() functions.

UNPARSED_TEXT_URI_RESOLVER_CLASS

Not applicable to SaxonCS

URI_RESOLVER_CLASS

Not applicable to SaxonCS

USE_PI_DISABLE_OUTPUT_ESCAPING

Not applicable to SaxonCS

USE_TYPED_VALUE_CACHE

This option is relevant only when the TinyTree is used; it determines whether (for a validated document) a cache will be maintained containing the typed values of nodes.

Typed values are held in the cache only for elements and attributes whose type is other than string, untypedAtomic, or anyURI. The default value is true. Setting this value to false can reduce memory requirements at the cost of requiring recomputation of typed values on each access.

USE_XSI_SCHEMA_LOCATION

This option determines whether or not to use the xsi:schemaLocation and xsi:noNamespaceSchemaLocation attributes in an instance document to locate a schema for validation.

Note, these attribute are only consulted if validation is requested; the presence of one of these attributes never by itself triggers validation.

VALIDATION_COMMENTS

This option determines whether non-fatal validation errors in XQuery or XSLT result documents should result in comments being inserted into the result tree. The command-line flag -outval:recover sets both this option and the FeatureKeys.VALIDATION_WARNINGS option.

VALIDATION_WARNINGS

This option indicates (if true) that errors occuring while validating a final result tree are not to be treated as fatal.

Regardless of the setting of this option, all validation errors are reported to the error() method of the ErrorListener, and validation is terminated if the error() method throws an exception, or if the error limit set in the ParseOptions object is reached.

This option primarily controls what happens at the end of a validation episode. If the validation episode detected one or more validation errors, then when this option is off, an exception is thrown, which will normally result in any query or stylesheet failing with a dynamic error, and no output file being written. If the option is on, no exception is thrown, and the output is written as if validation had been successful. Note in this case that any type annotations present in a result document are unreliable.

If this option is set when running XSLT or XQuery, it is ignored as far as input files are concerned: validation errors in input files are still fatal. However, if the option is set and a validation error occurs in a final output file, the output file is still written and the process terminates as if successful.

The detailed interpretation of this option changed in Saxon 9.5.

VERSION_WARNING

Indicates whether a warning message should be notified (to the ErrorListener) if running Saxon against an XSLT stylesheet that specifies version="1.0".

From Saxon 9.8, the warning is no longer output (since XSLT 3.0 does not require it), so this option is ignored.

XINCLUDE

Not applicable to SaxonCS

XML_PARSER_FEATURE

Not applicable to SaxonCS

XML_PARSER_PROPERTY

Not applicable to SaxonCS

XML_VERSION

This determines the XML version used by the Configuration.

Note that source documents specifying xml version="1.0" or "1.1" are accepted regardless of this setting. The effect of this switch is to change the validation rules for types such as xs:Name and xs:NCName, to change the characters allowed in names within XPath expressions (etc.), to change the meaning of \i and \c in regular expressions, and to determine whether the serializer allows XML 1.1 documents to be constructed.

The default is 1.0.

SaxonCS uses the System.Xml parser, which does not support XML 1.1.

XPATH_VERSION_FOR_XSD

The XSD 1.1 specification states that XPath version 2.0 is used for expressions appearing in assertions and type alternatives. This option allows XPath 3.0 or 3.1 to be used instead.

The recognized values are the integers 20, 30, and 31 representing versions 2.0, 3.0, and 3.1 respectively.

XPATH_VERSION_FOR_XSLT

The XSLT 3.0 specification states that processors are required to support XPath 3.0 expressions within stylesheets, together with some extensions (maps) selected from the XPath 3.1 specification. Support for the full syntax of XPath 3.1 is optional, but it is the default in Saxon. This option allows a different XPath language level to be selected.

The integer values 20, 30, and 31 denote XPath 2.0, 3.0, and 3.1 respectively, while the value 305 denotes XPath 3.0 with the extensions defined in the XSLT 3.0 specification.

XQUERY_ALLOW_UPDATE

Determines whether XQuery Update syntax is accepted.

If true, update syntax is accepted, if false, it is not accepted. Setting the value to true does not mean that the query has to use update syntax, only that it may do so.

From Saxon 9.6, XQuery Update syntax and XQuery 3.0 syntax can be mixed, although this combination is not defined by any W3C specification at the time of writing.

This option can be set for a particular XQuery compilation. When the option is set at the Configuration level, it acts as a default.

On the command line, this option is combined with the option "discard" which indicates that updates are allowed, but the updates are not written back to filestore. This does not correspond to any option in the Java API, where writing an updated document back to filestore only happens if explicitly requested.

XQUERY_CONSTRUCTION_MODE

This option defines the default value of the construction mode in the XQuery static context (overridable in the query prolog).

This option can be set for a particular XQuery compilation. When the option is set at the Configuration level, it acts as a default.

XQUERY_DEFAULT_ELEMENT_NAMESPACE

This property defines the default namespace for elements and types that are not qualified by a namespace prefix.

This option can be set for a particular XQuery compilation. When the option is set at the Configuration level, it acts as a default.

XQUERY_DEFAULT_FUNCTION_NAMESPACE

This property defines the default namespace for function names that are not qualified by a namespace prefix.

This option can be set for a particular XQuery compilation. When the option is set at the Configuration level, it acts as a default.

XQUERY_EMPTY_LEAST

This property defines how the empty sequence is handled in XQuery sorting (the "order by" clause). If true, () comes at the start of the sorted sequence; if false, it comes last.

This option can be set for a particular XQuery compilation. When the option is set at the Configuration level, it acts as a default.

XQUERY_INHERIT_NAMESPACES

This property defines the default value of the inherit-namespaces property in the XQuery static context.

This option can be set for a particular XQuery compilation. When the option is set at the Configuration level, it acts as a default.

XQUERY_MULTIPLE_MODULE_IMPORTS

If the value is false, then when an import module declaration is encountered for a module URI that is already among the known loaded modules (or modules in the process of being compiled), the import module is treated as a reference to the existing module. If the value is true, the system first checks whether the supplied "location hints" match the known location of the existing module, and the existing module is used only if there is a match.

XQUERY_PRESERVE_BOUNDARY_SPACE

This property defines whether "boundary space" (insignificant space in direct element constructors) should be retained or not.

This option can be set for a particular XQuery compilation. When the option is set at the Configuration level, it acts as a default.

XQUERY_PRESERVE_NAMESPACES

This property defines whether unused namespace declarations are retained by XQuery element copy operations.

This option can be set for a particular XQuery compilation. When the option is set at the Configuration level, it acts as a default.

XQUERY_REQUIRED_CONTEXT_ITEM_TYPE

This property defines the default expected context item type for a query.

This option can be set for a particular XQuery compilation. When the option is set at the Configuration level, it acts as a default.

XQUERY_SCHEMA_AWARE

A query will automatically be schema-aware if it contains an import schema declaration. This property allows a query to be marked as schema-aware even if it contains no import schema declaration. It is necessary for a query to be compiled as schema-aware if it is to handle typed (validated) input documents in which nodes have type annotations based on their schema-defined type.

This option can be set for a particular XQuery compilation. When the option is set at the Configuration level, it acts as a default.

XQUERY_STATIC_ERROR_LISTENER_CLASS

Not applicable to SaxonCS

XQUERY_VERSION

This property determines the version of XQuery used by the Configuration.

Indicates the version of XQuery syntax that is accepted. From Saxon 9.8, an XQuery 3.1 processor is always used by default. So setting this property to a value less than 3.1 is no longer allowed. The value "4.0" enables experimental syntax extensions that are under discussion in the XML community, and subject to change.

XSD_VERSION

This property determines the version of XML Schema used by the Configuration.

From Saxon 9.8, the default is XSD 1.1. If XSD 1.0 is selected, XSD 1.1 features will be rejected, with the exception of the version control attributes that allow sections of the schema to be marked as requiring XSD 1.0 or XSD 1.1.

XSLT_ENABLE_ASSERTIONS

This property indicates whether assertions (XSLT 3.0 xsl:assert instructions) are enabled or disabled. They are disabled by default. Setting this property on causes assertions to be enabled at compile time for all XSLT packages compiled using the default configuration options.

This option can be set for a particular XSLT compilation. When the option is set at the Configuration level (or on a TransformerFactory), it acts as a default.

If assertions have been enabled at compile time for a particular package, they can still be disabled at run-time (for all packages) by setting an option on the Xslt30Transformer. But if assertions were disabled at compile time, enabling them at run-time has no effect.

XSLT_INITIAL_MODE

This property indicates the name of a mode within a stylesheet in which execution (using template rules) should begin.

This option can be set for a particular XSLT transformation. When the option is set at the Configuration (or on a TransformerFactory), it acts as a default.

XSLT_INITIAL_TEMPLATE

This property indicates the name of a named template within a stylesheet where execution should begin.

This option can be set for a particular XSLT transformation. When the option is set at the Configuration level (or on a TransformerFactory), it acts as a default.

Specifically, if the transformation is performed using the transform() method of class net.sf.saxon.s9api.XsltTransformer, then the transformation will proceed by calling the relevant named template, rather than by applying templates to the supplied source node. It will also affect other APIs built on top of the XsltTransformer, notably the JAXP transformation interface, which in turn is used by many higher-level interfaces such as Ant. Indeed, the main purpose of this configuration option is to allow named-template stylesheet invocation using the JAXP interface, which was designed without this feature in mind.

This configuration option is ignored when using an net.sf.saxon.s9api.Xslt30Transformer, or other interfaces built on top of an Xslt30Transformer, for example the net.sf.saxon.Transform command line interface.

XSLT_SCHEMA_AWARE

This property indicates whether stylesheets should be compiled with the ability to handle schema-typed input documents. By default a stylesheet is compiled to handle such input if it contains an xsl:import-schema instruction, and not otherwise. It is necessary for a stylesheet to be compiled as schema-aware if it is to handle typed (validated) input documents in which nodes have type annotations based on their schema-defined type.

This option can be set for a particular XSLT compilation. When the option is set at the Configuration level (or on a TransformerFactory), it acts as a default.

XSLT_STATIC_ERROR_LISTENER_CLASS

Not applicable to SaxonCS

XSLT_STATIC_URI_RESOLVER_CLASS

Not applicable to SaxonCS

XSLT_VERSION

This property determines the version of XSLT to be supported by default.

From Saxon 9.8, an XSLT 3.0 processor is always used by default. So setting this property to a value less than 3.0 has no effect.

The value 4.0 enables experimental syntax extensions, under discussion in the XML community, which are subject to change.

ZIP_URI_PATTERN

Not applicable to SaxonCS