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Multiple XML Nodes of the same Type


John Adriaan
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According to the "Node Types" table on this W3Schools page, only the Document Node has a limit to the number of child Nodes (other than None!) of any one type:

Quote

"Element (max. one)"

The implication is that there can be any number of any other (listed) Child node in a Parent Node.

  • For many Nodes, that's a natural state:
    An Element Node can have many other Child Element Nodes to define the complete Tree.
  • For some Nodes, it's a little less natural:
    For example, one might think that a Comment Node is commenting on its Parent Node. Nope!
    A Comment Node is merely a child of its Parent, and is likely commenting on the following (or preceding!) Sibling Node - not the Parent Node.
  • But there are some Nodes where it's not obvious how multiple Child Nodes of the same Type should be represented.

Take, for example, the Element Node. It allows - in fact needs - a Text Node as a Child Node to store the actual text of Leaf Elements.

One could say that in a typical XML document, all Element Nodes have:

  • either zero (for empty Elements), one, or multiple Child Element Nodes;
  • or exactly one Child Text Node.

But this isn't (apparently) stipulated in the standard - hence this post.

  1. If a Child list has Child Text Nodes interspersed amongst Child Element Nodes, do they just get represented like that?
    <Parent>
      This is the first piece of text from the first Text Node.
      <Child1>
        ...
      </Child1>
      <Child2>
        ...
      </Child2>
      This is the second piece of text from the second Text Node.
      <Child3>
        ...
      </Child3>
    </Parent>

     

  2. How does are multiple Child Text Nodes represented?

    A simple concatenation of all the Texts? In the given order?

    <Parent>
      This is the first piece of text from the first Text Node. This is the second piece of text from the second Text Node.
    </Parent>
  3. How does one represent Child Text Nodes of Attr Nodes, as described/permitted in the above Node Types Table?

     

     

     

     

And I've not even considered EntityReference Nodes yet - which are also explicitly described as legal Child Nodes of Attr Nodes. (How?)

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I ran these through the JavaScript XML parser, to see if I could reveal the nature of the nodes. Worked well.

On 3/29/2019 at 12:18 AM, John Adriaan said:

If a Child list has Child Text Nodes interspersed amongst Child Element Nodes, do they just get represented like that?

#text
Child1
Child2
#text
Child3

 

On 3/29/2019 at 12:18 AM, John Adriaan said:

How does are multiple Child Text Nodes represented?

#text

The example noted has them together, so there is no separation, and they are concatenated as if it was one.

On 3/29/2019 at 12:18 AM, John Adriaan said:

How does one represent Child Text Nodes of Attr Nodes, as described/permitted in the above Node Types Table?

This part of that node page seems a little outdated. Attr Nodes aren't specifically... 'nodes' when processed (by JavaScript at least, but I don't know what other things there would be.)

 

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