URL is the source for the XML document. The above URL contains the data as shown in the figure 1.
This is the Xpath selector. In the above example we want all the child elements of the "CD" node (tag).
Under the "CD" node we can see that there are 6 different child elements. When InfoCaptor parses the XML document it returns all child elements in one stream.
It does not come in rows and columns. It is just a continuous stream of child elements that match the selector.
So when you mention the column names in the "columns" parameter it splits the stream in to chunks of rows and the number of elements in each row is determined by the number of columns defined in the above "columns" array.
So if we define 6 columns (any names you desire) we get this in a grid visual
Now if we change the number of columns to 5 we get this
Since we reduced the number of columns in a row, notice how the "1985" cell got pushed to the second row in Fig 3.
Similarly all the cells get pushed one position away.
So, What happens if you just provided one column?
So this gives a very powerful way of streaming your XML data.