Xslt Check If Node Has Value

For each node in this list that matches the count attribute, the processor counts how many preceding matching siblings it has, and adds one for the node itself. Bob DuCharme. There is given XSLT interview questions and answers that has been asked in many companies. On the last couple of characters are ' ' " (of course not spread out like that) system closed 2014-10-08 00:34:58 UTC #3 Home Categories FAQ/Guidelines Terms of. In case of "one of these nodes", the former solution might have helped you enough. It is used for the for-each and value-of XSL methods. A tree structure contains root element (as parent), child element and so on. The element is used to put a conditional test against the content of the XML file. When you have words like "which" and "whose" in your problem description, then you're going to use predicates in your match. I have a check in my xslt that checks if a 'stars' node exists in 'fields' and if 'image' node exists in 'product' node. 0 using a default can be achieved in different ways if the "value" is a node-set or. I understood that you have a XML Document and you want to change the content. In our case, in order to use XSLT, we first assume the HTML is a strict XML document using the HTML tags, i. I'll cover the following topics in the code samples below: Xslt, Xml, Parent Node, and Xsl. You can use XPath expressions to set variables with values of these types. The Element. In this example, we've created a sample XML document, students. When you have words like "which" and "whose" in your problem description, then you're going to use predicates in your match. XML XSL; Local Namespace ; In XML, a namespace is used to prevent any conflicts with element names. the XSLT processor is not supplying a value for the parameter. If the pretty printer can figure out the code type without assistance, an empty value will be sufficient. Because XML allows you to create your own element names, there's always the possibility of naming an element exactly the same as one in another XML document. For that xml I need to check each node whether its div tag or span tag or style tag. Behavior of this function in XslCompiledTransform is aligned with the behavior of the same function in MSXML and exsl:node-set, which allow converting a value of an arbitrary type into a text node containing a string representation of that value. As for the specific issue is a processing-instruction, and so your xsl:if that checks for text() will not pick this up. List the attribute names and values: 4. 61 XSLT To perform an XSL transformation a program referred to as an XSLT from CS 101 at VIT University. Using an apply-templates tag, or something that I haven't thought of yet, how do I select all IMMEDIATE children of the current node? For example, if XSLT: How to select ONLY the children of the current node?. * Contains no text content: not (string (. Which components have a TOC The DocBook XSL stylesheets use the generate. A non-zero value specifies the maximum depth. You can use XPath expressions to set variables with values of these types. A well-formed and valid XML document is one which have been validated against DTD. This allows you to check the power of conditional processing in XSLT. XML schema architecture is like a tree structure that has one root element and a number of branch elements. " NOTE: XSLT and XPath have list-based functions, but they are not supported by ColdFusion's current XSLT engine. Finally, when allowing pretty-printing of code (see "html-pretty-print" in Section 3. This is fairly similar to the W3C DOM model an XML or XSLT processor would use. This expression selects the child nodes of the current node, and then it selects the child nodes of the nodes. The example tests the value of the corresponding type element, and the comparison value is xsl:when statements. For a stylesheet designed to execute under either XSLT 1. Attributes, just like any other node, can be the subject of a conditional statement. Evaluate e starting at the document node. First, we will take a look at the syntax of keys and then we will look at how they are used in practice. The processor looks at all ancestors of the current node and the current node itself, stopping when it reaches a match for the from attribute, if there is one. Generate a RDLC dynamically for the VS 2005 Report Viewer Control The main drawback to the Report Viewer control in VS 2005 is that it relies on a pre-defined xml definition for the Report, or RDLC file. However, if you combine XML data with an XSL Transformations (XSLT) style sheet, you will then have a powerful way to dynamically transform and present information in any format you want. I work with OSB 12c. As for the specific issue is a processing-instruction, and so your xsl:if that checks for text() will not pick this up. The xsl:mode declaration is new in XSLT 3. The XML logging is useful e. XPath object (see XPath and XSLT with lxml: Stylesheet-parameters for background on this). This advanced XML editor provides the most intuitive tools for XML editing, authoring, and development. The xsl:value-of element provides the mechanism for transforming XML documents because it allows you to output XML data in virtually any context, such as within HTML markup. 0 constructs. The only extension function that > is used is to get the "xml" property of a node. I'm having issues with checking to see if an XML element has a value. It has only the user-defined tags. how to test an empty element in XSL?. 3, the "x:lang" attribute can used to explicitly opt into pretty-printing. This section has shown how to produce publication quality output from an XML file. The solution is to create a multiple alternative construct using a combination of xsl:choose, xsl:when, and xsl:otherwise elements. The value of the name attribute is interpreted as an attribute value template (expressions in curly braces are evaluated and converted to strings as in the , if you want to test whether it has any text child nodes then is the right approach. The XML DOM tree has a SAX2 “content handler” that receives the SAX events (e. ) This is in contrast to the fn:empty function, which will return true for any element regardless of whether it has any content. Splitting Delimited Values in BizTalk Maps By Richard Seroter on October 7, 2008 • ( 6) Today, one of our BizTalk developers asked me how to take a delimited string stored in a single node, and extract all those values into separate destination nodes. Returns a true value if this is an element object. The tree structure makes easy to describe an XML document. There can’t be two flows with the same name in the same page sequence. (If you want to implement an if-then-else statement, see the section The Element” later in this. 0, the capabilities of the xsl:for-each-group instruction are extended by virtue of the fact that the pattern used in group-starting-with or group-ending-with can now match atomic values as well as nodes. See Chapter 8. Some versions of Explorer's XSLT processor don't require the select attribute (and assume the current node if it is missing). The remainder of the stylesheet is one template rule for each attribute or element type whose datatype we want to check. The default value is no. compare attribute value: 2. Exporting data to Excel - XML to the rescue. You may have to register before you can post: click the register link above to proceed. If the value of test evaluates to the boolean value true, then all elements inside the are processed. (If you want to implement an if-then-else statement, see the section The Element" later in this. xml" was obviosuly the lookup table,. You'll have to create a single element with the id and make the content of the element conditional. Test your XSLT and XML codes in a very easy and webbased tool: just paste your XSLT and XML codes (of it's URL) and hit the process button to see how it goes. But we want the name of students as item list. In our case, in order to use XSLT, we first assume the HTML is a strict XML document using the HTML tags, i. As far as describing node locations, both of these expressions have a different meaning depending on where they are located within the greater XPath value. If there is no xsl:otherwise element, then the xsl:choose element is exited. To check whether an element has a value or has the attribute xsi:nil = 'true', the condition should look like the following: xsl:if test="not (element/@xsi:nil = true())" For example, if the XML document is as below and we want to check whether the element ORDER_DATE has a value or has an empty attribute, we need to use the below XSLT:. Thus, each fo:page-sequence can contain at most five fo:flow children, one for each of the five regions on the page. An attribute is considered empty if its value is a zero-length string (e. The select attribute is an XPath expression - if it selects a node set, only the string value of the first node in the set will be output. Node-sets are cast to a Boolean True if they contain at least one node. W3C XML Schema has a formal mechanism for attaching a schema to an XML document, while RELAX NG intentionally avoids such mechanisms for security and interoperability reasons. " Just to clarify, i really want to be looking for all nodes other than X, Y, and Z, and not their values as I had posted. I did something similar to this already. SLAX has a number of built-in functions which are also covered. That's not really what you show us - your groups are based on the. When the value is yes , the XSLT processor disables the normal escaping of markup characters in the value of the text node when it serializes the result. The Extensible Markup Language (XML) has become the de facto standard data representation format for the Internet. Because the actual parameter corresponding to value can be a complex XSL-FO element, we need to copy the whole tree of the parameter and not simply use xsl:value-of. So add < xsl:value-of select=”” / > within the LI tags. The xsl:element is used to create an output element whose name might be calculated at run-time. Unlike W3C XML Schema, RELAX NG was designed so that validation and augmentation (adding type information and default values) are separate. In XSLT, XPath is used to navigate and process elements in the source. For a reference on SAX2 see: D. An ancestor element of the text node has an xml:space attribute with a value of preserve , and no closer ancestor element has xml:space with a value of default. 0 is in fact a subset of XQuery 1. XSL is an XML grammar and, like all XML grammars, all tags must have closing tags to satisfy the definition of well-formed. The xml:space behavior cascades to all descendant elements but can be turned off locally by setting the xml:space attribute to default. Ultimately I would like to recurse through INDI nodes to related FAM nodes. List the attribute names and values: 4. The element has three attributes: name - the name of the index match - a pattern that defines the nodeset we want indexed use - an expression that defines the value to be used as the index key value. If the checked value can be cast to the specified type, then nothing gets output. The XML file I work with contains records that most of the time have three unique nodes. If the value of test evaluates to the boolean value true, then all elements inside the are processed. If you want to follow this path, you could first create a XmlDocument instance and load the XML. It is, however, officially required. Let's see the list of top XSLT interview questions. Here is synopsis for 'xml sel' command: XMLStarlet Toolkit: Select from XML document(s) Usage: xml sel {} [ ] where - global options for selecting - input XML document file name/uri (stdin is used if missing) - template for querying. Is there any solution to a "case-insensative" XSLT Transform? We have an XSLT transform that is trying to "append" an XML doclet to a larger XML doclet. Class to output the XSLT result tree as a sequence of bytes representing the result tree as serialized XML This implements the (String name, String value. Thanx for your explenation I now see how xsl is working. For example, the next footnote would have “2” as its number and “#note2” as the value of its @href attribute. If we add a select attribute to the element it will process only the child element that matches the value of the attribute. Splitting Delimited Values in BizTalk Maps By Richard Seroter on October 7, 2008 • ( 6) Today, one of our BizTalk developers asked me how to take a delimited string stored in a single node, and extract all those values into separate destination nodes. Set a value in the LocalEnvironment folder. Element Information. Hence in order to handle blank nodes use below expresssion:. Shawn Milochik wrote: What I want to do is check whether a node with multiple children, all containing attribute "name," happens to have a child where the "name" attribute is "address1. The element is used to put a conditional test against the content of the XML file. I work with OSB 12c. Supports XSLT 1. In other words, for every fms:CostCentre which has a sibling fms:GLAccntApp element whose value is 4754 and whose parent is an fms:Appropriation element, change the value to 230. The important bit is highlighted. The default value is no. the is calculated by then evaluating the complete expression by obtaining the XPath expression (the child element node named "Name") relative to the returned set of key nodes (Employee elements), thus returning the resulting value (the string "John Smith"). We need something else to check this constraint. In the tables, you can find a list of the attributes that you can specify. Our XSLT code has been outputting "Found a learner!" for each student element found. When the value is yes , the XSLT processor disables the normal escaping of markup characters in the value of the text node when it serializes the result. By default, all of the source nodes are added to this list, but you can remove one (or more) by adding them to the xsl:strip-space element. The name attribute is an attribute value template, so it may contain string expressions inside curly braces. To check whether an element has a value or has the attribute xsi:nil = ‘true’, the condition should look like the following: For example, if the XML document is as below and we want to check whether the element ORDER_DATE has a value or has an empty attribute, we need to use the below XSLT: Sample XML document: Sample XSLT: Historical Number. Advanced Topics in XSLT. 192 COMP311 Vladimir Sazonov 193 XSL InstructionsCommands in Templates xslapply from COMP 311 at University of Liverpool. I have a set of elements to be added to an existing XML document. Is there any solution to a "case-insensative" XSLT Transform? We have an XSLT transform that is trying to "append" an XML doclet to a larger XML doclet. XSLT transformation in Dynamics 365 for operation. (If you want to implement an if-then-else statement, see the section The Element” later in this. this stylesheet shows a typical example. XML was one of the first widely used, but lately JSON is blooming. ) Similar question: If myattrib3 has a value of "bbb" then "bbb found. Output the string value of the current node (ie, the artist's name) More complete XSLT for the CDs XSLT has become very close to XQuery (see later) XPath. The stylesheet that does 100% of the processing (although heavily > based on the original MS defaultss. So far I’ve used a single XSL template in my recipe-style. Code Comment #4 < xsl:if test =" UserName=''" > This tag is used to check if content in USERNAME node is empty or not. * Contains no text content: not (string (. XSLT: Check if a string is null or empty. Instantly share code, notes, and snippets. )) This comment has been minimized. how to do multiple condition check on. This isn't working so I would be thankful for suggestions. There is given XSLT interview questions and answers that has been asked in many companies. Mahmoud July 2001. I have a requirement to transform XML to XML where the resultant document should contain the parent nodes whose any of the child node has an attribute which is in the argument list. xml value XSL/XPath expression to check if a node contains at least one non-empty child xslt if element exists example (4) I need to check if an XML node has at least one non-empty child. XSLT is an XML-based language that you can use to transform one XML document into another text document. "code" as XPath finds a direct child node of the current node, named "code". ) This is in contrast to the fn:empty function, which will return true for any element regardless of whether it has any content. If the expression in this attribute evaluates to True when cast to a Boolean, the content of is instantiated and placed in the output. The Element The element can be used to extract the value of an XML element and add it to the output stream of the transformation:. RE: [xsl] check if a* not equal to attribute value Subject : RE: [xsl] check if a* not equal to attribute value From : "Michael Kay" < michael. If you use xslt variables it's important to check for null values Monday, March 14, 2011 because I'm not using XSLT to much and tend to forget this syntax, this is how you can check for null values in XSLT:. " Just to clarify, i really want to be looking for all nodes other than X, Y, and Z, and not their values as I had posted. 5 saves files in the editor, without asking, before running various tools such as XSLT transformations and validation. Using an apply-templates tag, or something that I haven't thought of yet, how do I select all IMMEDIATE children of the current node? For example, if XSLT: How to select ONLY the children of the current node?. An important point when using XSL patterns is that the names of properties and attributes, as well as the values of both, are case sensitive. I would like to check if "srportalurl" is not empty before show a ahref. If you ever need to pass an XPath as argument to the XSLT stylesheet you can pass in an etree. For example, you can use XSLT to accept an XML data document as input, perform arithmetic calculations on element values in the document, and generate an XHTML document that shows the calculation results. On the last couple of characters are ' ' " (of course not spread out like that) system closed 2014-10-08 00:34:58 UTC #3 Home Categories FAQ/Guidelines Terms of. This is especially useful if you're exporting to FTP destinations, because only then if this is set to "Yes" a local copy of the exported file will be kept so you can download it in Magento from the execution log or directly from the Magento server for. NiceXSL is supported by translators to and from standard XSL. In this way we can use the sum function and also you learned ,how to create a variable in xsl and use that in your XSL. You may have to register before you can post: click the register link above to proceed. a variable reference just evaluates to a value, just like any other xpath expression, so you test it the same way you'd test any other expression. One of the main benefits of XML is that it separates data from its presentation. The match attribute is used to associate a template with an XML element. NET Framework Forums on Bytes. What is the best way to check if this parameter is empty/null?. and XML Part II: JSP with XML in mind By Qusay H. Test to see if node with attribute exists in XML file with C#. It depends on what you mean by empty. this stylesheet shows a typical example. The phase parameter of the compile step is additionally exposed as a keyword argument. 5 saves files in the editor, without asking, before running various tools such as XSLT transformations and validation. Powered by Stylus Studio, the world's leading XML IDE for XML, XSLT, XQuery, XML Schema, DTD, XPath, WSDL, XHTML, SQL/XML, and XML Mapping! Go to Conference: Select Conference Stylus Studio Feature Requests Stylus Studio Technical Forum Website Feedback XSLT Help and Discussion XQuery Help and Discussion Stylus Studio FAQs Stylus Studio Code. 2 Base URI]). For example, suppose you have defined a variable named lap-count and it currently has a value of 32. XPath Introduction XPath Nodes XPath Syntax XPath Axes XPath Operators XPath Examples XSLT Tutorial XSLT Introduction XSL Languages XSLT Transform XSLT XSLT XSLT XSLT XSLT XSLT XSLT Apply XSLT on the Client XSLT on the Server XSLT Edit XML XSLT Examples XQuery Tutorial. Is there any solution to a "case-insensative" XSLT Transform? We have an XSLT transform that is trying to "append" an XML doclet to a larger XML doclet. Hello Experts, I need to write an xslt which will check if the 'Authorization' protocol header is present in the request, if it doesn't present, then reject the request with. This differs from the EXSLT highest() function, which returns all the nodes that have the maximum value. The only extension function that > is used is to get the "xml" property of a node. Extending XSLT with Java. The function is written in XSLT but it may be called from any XPath expression in the stylesheet. XSLT transformation in Dynamics 365 for operation. " has a different meaning. To check if the specific node exists in the tree or not in […]. If there is a default namespace in scope, then it is used to expand an unprefixed QName. If several nodes have the highest value, the result node-set contains the one that is first in document order. XML & XSLT: Using how could I test if a tag exists in current context? If this is your first visit, be sure to check out the FAQ by clicking the link above. In my project, I can receive empty node in XML. This differs from the EXSLT highest() function, which returns all the nodes that have the maximum value. It's possible - but in this case it's not at all trivial. The XML logging is useful e. There is often a requierment to export report data to a Microsoft Excel spreadsheet. XSL value-of evaluating variable as string and not node. If the template contains a xsl:param element with the same name as name attribute of xsl:with-param, this value is used. XSLT templates can be activated several times for an XML document and produce different. I have a workaround for now : I'm using the "//" in my XPath but I do it on an empty XmlDocument : meaning I create a new XmlDocument, and I import my node from one to the other. A flow for the body has the flow-name of xsl-region-body. It is used to transform XML documents into other formats (like transforming XML into HTML). This example is a continuation of the example from the previous lesson. "particular node is NOT equal to a SET of values. If none of the test conditions in any xsl:when element is satisfied (all return False), then the xsl:otherwise element is automatically selected (if it is present) and the code associated with that element is executed. XSL References. In this example, the value of the "name" node (rather than the literal string "name") will be used to create an XML attribute, whose contents are an empty element with a name of "from‑" concatenated with the value of the address node. The name attribute is an attribute value template, so it may contain string expressions inside curly braces. If the node set is empty, there is nothing to output. If test evaluates to false, then the contents of the element are ignored. ) There are three options. An XSLT transformation converts an XML document into another XML or a text document through a stylesheet. The example tests the value of the corresponding type element, and the comparison value is xsl:when statements. This tells the XSLT processor to add the xsl:if element's contents to the result tree if the context node (in this case, the poem element node listed as the xsl:template element's match attribute value) has an attribute specified with that name. Finding Children. The title's text has no children so the processor cannot go to the next level. When to use xsl:if and xsl:when In the last few weeks I have been approached by work colleagues for advice on this subject a couple of times, so I guess there must be more people out there that will either be searching the web for answers or aren't entirely clear about when xsl:if or xsl:when should be used, and the constraints of using either. For more information on CHOOSE statement, check the. In other cases, I used location paths to extract the contents of a node using xsl:value-of. The log format is protocol independent. Understanding the node-set() Function. processing instructions like a stylesheet declaration are also nodes. The 12 c XSLT Editor has the ability to create schemas from XML documents that can then be used as schema documents for a source or target tree. So what do we do to check this constraint? (Interestingly, for the above instance document, the XML Schema that is shown would accept it as valid, whereas, in fact it is not since the value of A is less than the value of B. All value of the node with the same attribute value for Type should be merged in one node. A non-zero value specifies the maximum depth. In other words, for every fms:CostCentre which has a sibling fms:GLAccntApp element whose value is 4754 and whose parent is an fms:Appropriation element, change the value to 230. By default, all of the source nodes are added to this list, but you can remove one (or more) by adding them to the xsl:strip-space element. This tag is used to check if USERNAME node exists or not. However, there is one difference. XML Forums on Bytes. If the value of test evaluates to the boolean value true, then all elements inside the are processed. The xsl:element is used to create an output element whose name might be calculated at run-time. The style sheet has no rule to match text but there is another built-in template that copies the text in the resulting tree. How can I test for this parameter being NULL of empty (length of <= 0)?. This advanced XML editor provides the most intuitive tools for XML editing, authoring, and development. If we add a select attribute to the element it will process only the child element that matches the value of the attribute. I have a requirement to transform XML to XML where the resultant document should contain the parent nodes whose any of the child node has an attribute which is in the argument list. Finding Children. This means that on each step of evaluation, the ". @Alejandro provided one way to get a default value if a variable that is supposed to contain a node-set is empty. Input xml *****. W3C XML Schema has a formal mechanism for attaching a schema to an XML document, while RELAX NG intentionally avoids such mechanisms for security and interoperability reasons. [Download XSLT stylesheet] Grouping by manufacturers in XSLT stylesheet In this scenario selecting distinct manufacturer nodes is the key thing, although logic is bit more complicated. attribute omitted: 8. My requirement is that I need to check whether the element is already there in the XML file. An attribute is considered empty if its value is a zero-length string (e. Yes we can have multiple conditions in the same element. For example, you can use XSLT to accept an XML data document as input, perform arithmetic calculations on element values in the document, and generate an XHTML document that shows the calculation results. The xsl:element is used to create an output element whose name might be calculated at run-time. You have not defined well what does it mean for "a node to have value". Use name() function to get attribute name. Admittedly some of the frustration is based on my relative lack of experience with XSLT. The match attribute is used to associate a template with an XML element. I have a set of elements to be added to an existing XML document. is the right way of producing pure-white-space nodes choose and if are useful for branching based on complex decisions the resulting XHTML document contains a reference to a CSS stylesheet (XSLT and CSS work well together!) it is difficult to ensure that the output is always valid!. The xsl:value-of and xsl:text instructions have an optional attribute named disable-output-escaping, whose value must be yes or no. In my project, I can receive empty node in XML. The Element To put a conditional if test against the content of the XML file, add an element to the XSL document. If there is no xsl:otherwise element, then the xsl:choose element is exited. Axes are also associated with the context node. A non-zero value specifies the maximum depth. I have a custom search result in xslt. XSLT defines markup that represents trees, nodes, patterns, templates, and other constructs that can be used to transform XML documents from one markup vocabulary to another (or even to the same vocabulary with different data). How can I test for this parameter being NULL of empty (length of <= 0)?. In case if i check for the element using IsExistence functiod and if the element is present i dont see any issue. 0 but the allowed functions are not as many. Hi All I need to check if a current node has any child nodes. There is often a requierment to export report data to a Microsoft Excel spreadsheet. ACX Series,M Series,T Series,MX Series,SRX Series,EX Series,PTX Series,QFX Series. The element has only one attribute: test. If I change the the node in XML from. Namespaces affect the element in which they are declared, as well as all the child elements of that element. In other words, for every fms:CostCentre which has a sibling fms:GLAccntApp element whose value is 4754 and whose parent is an fms:Appropriation element, change the value to 230. 1 Reading Excel file from Application Server into ABAP Internal Table Applies to SAP ABAP Developers who are working on interface project. First, we will take a look at the syntax of keys and then we will look at how they are used in practice. Hence in order to handle blank nodes use below expresssion:. Supports XSLT 1. If the template contains a xsl:param element with the same name as name attribute of xsl:with-param, this value is used. The functx:if-empty function is useful for providing default values in case an element or attribute is empty or non-existant. A well-formed and valid XML document is one which have been validated against DTD. Using Value-Of, we can output the value of an XML node, wether it is a text node or attribute node (and I am sure other node types work as well). For example if the element has no value like. to be used), the input and the output The XSLT document is an XML document and must be well-formed If an element of the XSL template is not an xsl rule, it is not transformed. By defining the attribute value as "{Xpath}", the defined XPath value will be output. If the node set doesn't have a node element, then it doesn't. For example, you can use XSLT to accept an XML data document as input, perform arithmetic calculations on element values in the document, and generate an XHTML document that shows the calculation results. This award recognizes someone who has achieved high tech and professional accomplishments as an expert in a specific topic. Newbie: XSL value-of select not working value of a Text element within a Text element though. 0, the capabilities of the xsl:for-each-group instruction are extended by virtue of the fact that the pattern used in group-starting-with or group-ending-with can now match atomic values as well as nodes. If the attribute value equals vegetable we output the details. You can think of an XSLT template as being like a word processor’s find-and-replace feature. In this example, we've created a sample XML document, students. Because the actual parameter corresponding to value can be a complex XSL-FO element, we need to copy the whole tree of the parameter and not simply use xsl:value-of. " has a different meaning. Throughout this document, the prefix exsl is used to refer to this namespace. Assume that Cooktop will overwrite your file with the current contents of the editor at any given time! Make a backup of your files handy before you open them in Cooktop. The return value types of XPath evaluations vary, depending on the XPath expression used: True or False, when the XPath expression has a boolean result; a float, when the XPath expression has a numeric result (integer or float) a 'smart' string (as described below), when the XPath expression has a string result. tags and to attributes respectively. Slide 10: An XSL stylesheet. An important point when using XSL patterns is that the names of properties and attributes, as well as the values of both, are case sensitive. Unlike W3C XML Schema, RELAX NG was designed so that validation and augmentation (adding type information and default values) are separate. Computing the Value of a Node with xsl:value-of. I'm struggling a bit with following requirement to implement via xslt in DataPower. If the expression in this attribute evaluates to True when cast to a Boolean, the content of is instantiated and placed in the output. This example assumes that the distribution has been extracted into the same directory as your own stylesheet:. The trick part is, it has double negations. element is an element instance. If test evaluates to false, then the contents of the element are ignored. List the attribute names and values: 4. It must have a non-default namespace prefix. Because XSLT permits no side-effects, once the value of the variable has been established, it remains the same until the variable goes out of scope. Parameters are assigned a value either from the process that invoked the stylesheet (top-level parameter), or from a or from a default value (in which case it behaves as if it was a variable). ) There are three options. For example, you can use XSLT to accept an XML data document as input, perform arithmetic calculations on element values in the document, and generate an XHTML document that shows the calculation results. For example if the element has no value like. The xsl:element is used to create an output element whose name might be calculated at run-time. If the node set has a node in it, then it shows that the child element exists. An element is considered empty if it does not have any content (e. If none of the test conditions in any xsl:when element is satisfied (all return False), then the xsl:otherwise element is automatically selected (if it is present) and the code associated with that element is executed. If you ever need to pass an XPath as argument to the XSLT stylesheet you can pass in an etree. We could use the XSL if element to test the value. Improper use of node test text () The XPath expression inside the xsl:value-of instruction is shorthand for the expression child::text(). A non-empty text node is output as a one-element list using the named template defined on line 128‑ with an empty label and the normalized text content as value parameter.