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The ISO Schematron Skeleton API
API for ISO Schematron Skeleton
Rick Jelliffe, 2010/04/14
This document provides documentation on the XSLT API available in
the implementation of Schematron called iso_schematron_skeleton.xsl.
(available in an XSLT1 and XSLT2 version). The API makes available as
much information from the schema, however there may be some edge
cases where it is not exhaustive.
The skeleton is an XSLT script which provides all the basic
parsing and validating routines for compiling a Schematron schema
into XSLT. Schematron was designed to allow many different uses, and
the skeleton gives you a headstart in creating a customized
implementation. You just need to write XSLT templates to override the
default ones. (The program you write is sometimes called a
meta-stylesheet.) It is the meta-stylesheet that is called
as the XSLT script, not the skeleton. There are several
pre-processing stages which the Schematron schema should be processed
through first, to handle such things as include statements and
abstract patterns.
Phases and error reporting for problems in the schema itself are
handled by the skeleton with no interaction with a “meta-stylesheet”.
Note that there is no guarantee that the context node is always the
element being handled: in most cases the only information available
is the information in the parameters.
For an introductory tutorial on using this API, see Bob DuCharme's
Schematron 1.5:
Looking Under the Hood
Superset of API for Schematron 1.5 and 1.6
(This is an updated version of the API for the Schematron 1.5
implementation called skeleton1-5.xsl, which in turn comes
from the new architecture contributed by Oliver Becker for
Schematron 1.3.)
The current API contains only additions. Well-written
meta-stylesheets that use the new API will be be able to run on the
existing 1.5 and 1.6 skeletons. Similarly, it should be possible to
upgrade the skeleton from 1.5 or 1.6 to the iso-schematron-skeleton
only by correcting the import statement at the beginning of the
meta-stylsheet. Additions or re-groupings from the 1.5 schema are
shown in red. Deletions have overstrike.
Mooted addition: a parameter @action which for specifying
processing instructions on assertions and reports.
process-prolog
The process-prolog template gets called at the start of
the validation session. It has no parameters. The default
implementation is no action.
process-root
The process-root template processes the root element of
the schema (which is not the same thing as the root of the document /
and need not be the document element /*) .
- node-list $contents
-
string $schemaVersion
-
The version of the schema, perhaps a datestamp.
-
"xslt" | "xpath" |
"xslt2" | ...
$queryBinding
-
The query language binding.
-
string $title
-
The title of this schema
-
"iso" | "1.5" |
"1.6" | ...
$version
-
The version of Schematron being used.
Rich properties:
- XML SystemId
$icon
-
The URI of an icon
-
XML ID
$id
-
The unique identifier with the schema for the
schema
element.
-
SGML FPI
$fpi
-
The Formal Public Identifier for this schema.
-
IETF language
$lang
-
The human language used in this schema, from
xml:lang
-
URL
$see
-
Link to documentation on WWW or file
-
"preserve" | "default"
$space
-
The value for xml:space
To print the documentation paragraphs, use <xsl:apply-templates
mode="do-schema-p" />
To output the results, use <xsl:copy-of select="$contents"
/>
process-assert
The process-assert template handles asserts whose test
has failed.
- XPath $test
-
The test
-
XML IDREFS $diagnostics
-
A list of the idrefs diagnostic elements related to the current
assertion
-
XML NMTOKEN
$flag
-
The name of a flag that becomes true because
this assertion fails. The flag is true for the document if it is
flagged true on any assertion. For compatability, this parameter
should not be used with Schematron 1.5.
Rich properties:
- XML SystemId
$icon
-
The URI of an icon
-
XML ID
$id
-
The unique identifier with the schema for the
assert
element.
-
SGML FPI
$fpi
-
The Formal Public Identifier for this
assertion.
-
IETF language
$lang
-
The human language used in this assertion,
from xml:lang
-
URL
$see
-
Link to documentation on WWW or file
-
"preserve" | "default"
$space
-
The value for xml:space
Linking properties:
- XML NMTOKEN
$role
-
A name for the generic role of this assertion.
The schema creator would have their own vocabulary.
-
XPath
$subject
-
A path relative to the current context to some
interesting node considered the subject.
To print the text contents, use <xsl:apply-templates
mode="text" />
process-diagnostic
The process-diagnostic template handles diagnostic
messages for assert statements that have failed and report
statements that have succeeded. The diagnostics are evaluated in the
context of the rule.
Rich properties:
- XML SystemId
$icon
-
The URI of an icon
-
XML ID
$id
-
The unique identifier with the schema for the
assert
element.
-
SGML FPI
$fpi
-
The Formal Public Identifier for this
assertion.
-
IETF language
$lang
-
The human language used in this assertion,
from xml:lang
-
URL
$see
-
Link to documentation on WWW or file
-
"preserve" | "default"
$space
-
The value for xml:space
process-dir
The process-dir template handles bi-directionality
markup, which is only needed by certain human scripts such as Arabic.
- "ltr" or "rtl" or ""
$value
-
Left-to-right or right-to-left or unspecified
process-emph
The process-emph template handles the markup of
emphasized text in paragraphs, assertions and diagnostics. It has no
parameters.
process-message
The process-message handles default outputing of text.
- string $pattern
-
Some text that may be some kind of pattern
-
string $role
-
Some text that may be some kind of role
process-name
The process-name templates handle name strings that can
be used in assertions. asssert and report only
provide name subelements rather than the more general
value-of elements to encourage plain language and generic
descriptions rather than specific diagnostics, for which purpose the
diagnostics elements are used.
- string $name
-
The name of the current element, or of the node specified by a name
element
process-ns
The process-ns template reports on ns
declarations, which are used to transmit on namespace information by
the skeleton.
- Namespace NCName $prefix
-
The prefix of a namespace
-
XML SystemId $uri
-
The (internationalized) URI Reference of a namespace
process-p
The process-p template handles paragraphs.
- XML NMTOKEN $class
-
An attribute that can be used for stylesheet style
-
XML ID $id
-
The unique identifier with the schema for the p element.
-
XML SystemId $icon
-
The URI of an icon
-
IETF Language $lang
-
The human language used in this paragraph
To print the text contents, use <xsl:apply-templates
mode="text" />
process-pattern
The process-pattern reports on the start of evaluation of
a pattern element.
- string $name
-
The title of the current pattern
-
XML NCNAMES $is-a
-
Empty or not provided if the pattern is not derived from an abstract
pattern. Otherwise the name of the abstract pattern. A list may be
used if there was a sequence of abstract patterns.
Rich properties:
- XML SystemId
$icon
-
The URI of an icon
-
XML ID
$id
-
The unique identifier with the schema for the
pattern
element.
-
SGML FPI
$fpi
-
The Formal Public Identifier for this pattern.
-
IETF language
$lang
-
The human language used in this pattern, from
xml:lang
-
URL
$see
-
A (internationalized) URI reference to some
supporting or defining documentation
-
"preserve" | "default"
$space
-
The value for xml:space
To print the documentation contents, use <xsl:apply-templates
mode="do-pattern-p"/>
process-report
The process-report template handles report whose
test has succeeded.
- XPath $test
-
The test
-
XML IDREFS $diagnostics
-
A list of the diagnostic elements related to the current assertion
-
XML NMTOKEN
$flag
-
The name of a flag that becomes true because
this assertion fails. The flag is true for the document if it is
flagged true on any assertion. For compatability, this parameter
should not be used with Schematron 1.5.
Rich properties:
- XML SystemId
$icon
-
The URI of an icon
-
XML ID
$id
-
The unique identifier with the schema for the
report
element.
-
SGML FPI
$fpi
-
The Formal Public Identifier for this report.
-
IETF language
$lang
-
The human language used in this report, from
xml:lang
-
URL
$see
-
Link to documentation on WWW or file
-
"preserve" | "default"
$space
-
The value for xml:space
Linking properties:
- XML NMTOKEN
$role
-
A name for the generic role of this assertion.
The schema creator would have their own vocabulary.
-
XPath
$subject
-
A path relative to the current context to some
interesting node considered the subject.
To print the text contents, use <xsl:apply-templates
mode="text" />
process-rule
The process-rule reports that a rule element has
fired: its context attribute matched some nodes. .
- XSLT expression $context
-
The expression that gives the context of the current
Rich properties:
- XML SystemId
$icon
-
The URI of an icon
-
XML ID
$id
-
The unique identifier with the schema for this
rule
element.
-
SGML FPI
$fpi
-
The Formal Public Identifier for this rule.
-
IETF language
$lang
-
The human language used in this rule, from
xml:lang
-
URL
$see
-
Link to documentation on WWW or file
-
"preserve" | "default"
$space
-
The value for xml:space
Linking properties:
- XML NMTOKEN
$role
-
A name for the generic role of this assertion.
The schema creator would have their own vocabulary.
-
XPath
$subject
-
A path relative to the current context to some
interesting node considered the subject.
process-span
The process-span handles span elements, which are generic
elements for styling, like HTML's .
- XML NMTOKEN $class
-
An attribute that can be used for stylesheet style
process-title
The process-title handles title elements, which are
generic elements for styling, like HTML's .
- XML NMTOKEN $class
-
An attribute that can be used for stylesheet style
By default, titles are handled by invocing process-p with
the parameter class with a value "title".
process-value-of
The process-value-of template handles value-of
elements, which are used in diagnostic messages to allow very
specific hinting .
- XPath $select
-
The path of some node that will be evaluated and printed.
Global Parameters
There are several global parameters that may be available for use.
However, it is not a requirement to follow these, and implementations
may not supply them with any value. So a test of
string-length(variable) <
0 is appropriate in each case.
Parameter
Value
Description
allow-foreign
"true" | "false" (default)
Pass non-Schematron elements to the generated
stylesheet. Pass the Schematron elements span, emph and dir: to
the output SVRL.
fileNameParameter
string
A parameter passed to the Validator and
potentially available as a variable in Schematron schemas as
$fileNameParameter
fileDirParameter
string
A parameter passed to the Validator and
potentially available as a variable in Schematron schemas as
$fileDirParameter
archiveNamePaameter
string
A parameter passed to the Validator and
potentially available as a variable in Schematron schemas as
$archiveNameParameter
archiveDirParameter
string
A parameter passed to the Validator and
potentially available as a variable in Schematron schemas as
$archivePathParameter
debug
“true” | “false” (default)
Verbose error messages (Note this may be
superceded by “verbose” at some stage in the future.)
generate-paths
true|false
generate the SVRL @location attribute with XPaths
diagnose
yes | no
Add the diagnostics to the assertion results
yes | no | true | false | assert
Terminate on the first failed assertion or
successful report
message-newline
"true" (default) | "false"
Generate an extra newline at the end of messages
output-encoding
string
The encoding used for output, for example if the
output is XML
-