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Diffstat (limited to 'bpmn/MSOCoreBPMN/src/main/resources/normalize-namespaces.xsl')
| -rw-r--r-- | bpmn/MSOCoreBPMN/src/main/resources/normalize-namespaces.xsl | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/bpmn/MSOCoreBPMN/src/main/resources/normalize-namespaces.xsl b/bpmn/MSOCoreBPMN/src/main/resources/normalize-namespaces.xsl new file mode 100644 index 0000000000..56c8a00987 --- /dev/null +++ b/bpmn/MSOCoreBPMN/src/main/resources/normalize-namespaces.xsl @@ -0,0 +1,185 @@ +<?xml version="1.0" encoding="UTF-8"?> +<!-- + ============LICENSE_START======================================================= + ECOMP MSO + ================================================================================ + Copyright (C) 2017 AT&T Intellectual Property. All rights reserved. + ================================================================================ + Licensed under the Apache License, Version 2.0 (the "License"); + you may not use this file except in compliance with the License. + You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + + Unless required by applicable law or agreed to in writing, software + distributed under the License is distributed on an "AS IS" BASIS, + WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + See the License for the specific language governing permissions and + limitations under the License. + ============LICENSE_END========================================================= + --> + +<xsl:transform xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:exsl="http://exslt.org/common" version="1.0" extension-element-prefixes="exsl"> + <!-- + Select one namespace node for each unique URI (almost), excluding + the implicit "xml" namespace. This does not filter out namespace + nodes declared on the same element with the same URI (thanks to + limitations of XPath 1.0); we take care of that later... Note that if + we had a distinct() function, this would be much, much simpler, + e.g. distinct(//namespace::*) + --> + <xsl:variable name="almost-unique-uri-namespace-nodes" select="//namespace::*[name()!='xml'][not(.=../preceding::*/namespace::* or .=ancestor::*[position()>1]/namespace::*)]"/> + + <!-- EXSLT functions are not supported by Saxon HE. Define the function we need here --> + <xsl:function name="exsl:node-set" as="node()"> + <xsl:param name="n" as="node()"/> + <xsl:sequence select="$n"/> + </xsl:function> + + <!-- Create a table of URI-prefix bindings --> + <xsl:variable name="almost-unique-uri-bindings-tree"> + <xsl:for-each select="$almost-unique-uri-namespace-nodes"> + <binding> + <prefix> + <xsl:choose> + <!-- + If there are any unqualified element names or + attributes in this namespace in our document, + then force default namespaces to use an arbitrary + prefix, because we want to guarantee that the + only namespace declarations in our result will + be attached to the root element. + --> + <xsl:when test="not(name()) and (//*[namespace-uri()=''] or //@*[namespace-uri()=current()])"> + <xsl:variable name="alternate-prefix-candidate" select="//namespace::*[count(.|current())!=1][.=current()][name()!=''][1]"/> + <xsl:choose> + <xsl:when test="$alternate-prefix-candidate"> + <xsl:value-of select="name($alternate-prefix-candidate)"/> + </xsl:when> + <xsl:otherwise> + <!-- + If no alternative candidates exist, then generate a + "random" one. + --> + <xsl:value-of select="generate-id()"/> + </xsl:otherwise> + </xsl:choose> + </xsl:when> + <xsl:otherwise> + <xsl:value-of select="name()"/> + </xsl:otherwise> + </xsl:choose> + </prefix> + <uri> + <xsl:value-of select="."/> + </uri> + </binding> + </xsl:for-each> + </xsl:variable> + + <!-- Select the first binding from the table for each unique URI --> + <xsl:variable name="unique-uri-bindings" select="exsl:node-set($almost-unique-uri-bindings-tree)/binding[not(uri=preceding::uri)]"/> + + <!-- + Since there is no <xsl:namespace/> instruction, the only way we + can create the namespace nodes we want is to create elements in + a certain namespace and with a certain (prefixed) name. + --> + <xsl:variable name="created-namespace-nodes-tree"> + <xsl:for-each select="$unique-uri-bindings"> + <xsl:variable name="prefix"> + <xsl:choose> + <!-- Replace a duplicated prefix with a different prefix. --> + <xsl:when test="prefix=preceding::prefix"> + <xsl:value-of select="generate-id()"/> + </xsl:when> + <xsl:otherwise> + <xsl:value-of select="prefix"/> + </xsl:otherwise> + </xsl:choose> + </xsl:variable> + <xsl:variable name="maybe-colon"> + <xsl:if test="string($prefix)">:</xsl:if> + </xsl:variable> + <xsl:element name="{$prefix}{$maybe-colon}temporary" namespace="{uri}"/> + </xsl:for-each> + </xsl:variable> + + <!-- + Select all the namespace nodes from our temporary tree + of namespace-decorated elements. + --> + <xsl:variable name="created-namespace-nodes" select="exsl:node-set($created-namespace-nodes-tree)//namespace::*"/> + + <!-- + Do for the root element the same thing we do for every element, + except that we explicitly copy all of our namespace nodes onto + the root element, eliminating the need for namespace declarations + to appear anywhere else in the output. + --> + <xsl:template match="/*"> + <xsl:call-template name="copy"> + <xsl:with-param name="insert-namespace-declarations" select="true()"/> + </xsl:call-template> + <!-- <xsl:call-template name="do-xsl-message-diagnostics"/> --> + </xsl:template> + + <!-- + For each element, create a new element with the same expanded name, + but not necessarily the same QName. We create a new element instead + of copying the original, because, besides potentially having a + QName we don't want, a copy would include with it all of the + namespace nodes attached to the original, and we don't necessarily + want that. + --> + <xsl:template match="*" name="copy"> + <xsl:param name="insert-namespace-declarations"/> + <xsl:variable name="prefix" select="name($created-namespace-nodes[.=namespace-uri(current())])"/> + <xsl:variable name="maybe-colon"> + <xsl:if test="$prefix">:</xsl:if> + </xsl:variable> + <xsl:element name="{$prefix}{$maybe-colon}{local-name()}" namespace="{namespace-uri()}"> + <xsl:if test="$insert-namespace-declarations"> + <xsl:copy-of select="$created-namespace-nodes"/> + </xsl:if> + <xsl:apply-templates select="@*|node()"/> + </xsl:element> + </xsl:template> + + <!-- + For each attribute, create a new attribute with the same expanded + name, but not necessarily the same QName. + --> + <xsl:template match="@*"> + <xsl:variable name="prefix" select="name($created-namespace-nodes[.=namespace-uri(current())])"/> + <xsl:variable name="maybe-colon"> + <xsl:if test="$prefix">:</xsl:if> + </xsl:variable> + <xsl:attribute name="{$prefix}{$maybe-colon}{local-name()}" namespace="{namespace-uri()}"> + <xsl:value-of select="."/> + </xsl:attribute> + </xsl:template> + + <!-- Do a simple copy of text, comments, and processing instructions --> + <xsl:template match="text()|comment()|processing-instruction()"> + <xsl:copy/> + </xsl:template> + + <!-- Print out some diagnostics to show what's going on beneath the covers. --> + <xsl:template name="do-xsl-message-diagnostics"> + <xsl:message> + <diagnostics xml:space="preserve"> + <diagnostic name="almost-unique-uri-bindings-tree"> + <xsl:copy-of select="$almost-unique-uri-bindings-tree"/> + </diagnostic> + <diagnostic name="unique-uri-bindings"> + <xsl:copy-of select="$unique-uri-bindings"/> + </diagnostic> + <diagnostic name="created-namespace-nodes-tree"> + <xsl:copy-of select="$created-namespace-nodes-tree"/> + </diagnostic> + </diagnostics> + </xsl:message> + </xsl:template> + +</xsl:transform> |