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if element not exists create xml element

Answer 1

+1 A:

Your question's really not at all clear, but in general, if you want an identity transform to populate a parent element with a default child element, you have to make a template for that, e.g.:

<xsl:template match="Parent[not(Child)]">
    <xsl:copy>
        <Child>This is the default Child element</Child>
        <xsl:apply-templates select="node()|@*"/>
    </xsl:copy>
</xsl:template>

The ordinary identity transform will copy any Parent element that does have a Child child element; this one, which only matches those that don't, copies the Parent element and its content, but inserts a Child element into it.

Edit:

Now that we know a little more about the data, here's a better example. Also, this addresses the concern about creating the element in its proper order in the document:

<xsl:template match="Salary/Max[not(preceding-sibling::Min)]"/>
   <Min Value="0">0</Min>
   <xsl:copy>
      <xsl:apply-templates select="node() | @*"/>
   </xsl:copy>
</xsl:template>

That will match any Max element that's a child of Salary and that doesn't have a preceding sibling named Min, and will emit the default Min element and then a copy of the Max element.

If you wanted to be even more explicit, you could use the pattern Salary/Max[not(preceding-sibling::*[1]/name() = 'Min')], which will match any Max element whose immediately preceding sibling is not named Min.

Robert Rossney 2009-11-16 08:35:09

Thanks for response, but regarding the question let me explain in salary block somewhere tag <Min> is exist and in some it is not exist. I want to create this tag where it is not exist with value 0.

naidu 2009-11-16 08:43:19

@Robert: your answer inserts the missing element but don't respect its position in the element order of the document.

Erlock 2009-11-16 09:27:52

Answer 2

+1 A:

In this case, you must use two templates which exclude themselves mutually:

<xsl:template match="Max[not(preceding-sibling::Min)]">
  <Min Value="0">0</Min>
  <xsl:copy-of select="."/>
</xsl:template>
<xsl:template match="Max[preceding-sibling::Min]">
  <xsl:copy-of select="."/>
</xsl:template>

Erlock 2009-11-16 09:21:38

Thanks for response, but it is not created where <Min><Max><Type>Currenct> tag is not exists. I need these tags in the xml file where they are not exist.

naidu 2009-11-16 09:38:16

Answer 3

A:

If the position of the Min tag is not important, you could change the template that matches any node so that when it matches a Job node, it inserts the missing elements at the end.

<xsl:template match="@*|node()">
   <xsl:copy>
      <xsl:apply-templates select="@*|node()"/>
      <xsl:if test="name()='Job' and not(Salary/Min)">
         <Min>0.00</Min>
      </xsl:if>
   </xsl:copy>
</xsl:template>

Alternatively, if you want the missing Min element to always appear in the same place (i.e. after the CompanyName element) you could do something like this.

<xsl:template match="@*|node()">
   <xsl:copy>
      <xsl:apply-templates select="@*|node()"/>
   </xsl:copy>
   <xsl:if test="name()='CompanyName' and not(../Salary/Min)">
      <Min>0.00</Min>
   </xsl:if>
</xsl:template>

Tim C 2009-11-16 13:22:40

Thanks for your help, but it is deleteing exiting tag <Min> tag with values and replacing with <Min>0</Min>, I want if any existing <Min> exists it should not change but if it is not exist is should create

naidu 2009-11-16 13:54:24

Are you sure? All my code does is append an extra Min node to the code. It does not delete anything the existing code did not.

Tim C 2009-11-16 14:09:49

Yes, i tested the code, which is creating <Min> tag but even deleting the existing one and replacing with 0.00

naidu 2009-11-17 04:26:58

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if element not exists create xml element

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