Polycom, Inc 185 | Polycom PDS 2000 manual

Data Source Tutorial	Appendix B: Data Parser

Now that we've isolated the weather data for a single day part, we can extract that data and save it in a row of our table. First we obtain the name of the day part using a GetTag rule to extract the text the lies between the and tags in the DaySource container:

</ParsingRule>

There's a subtle problem here. What we want is to extract the text from between the first (indeed, the only) pair of and tags. However, simply adding the above rule to the <DataItem> element will not work:

</ParsingRule>

</ParsingRule>

</DataItem>

The above code will only extract the first day part's name, but will not extract anything for subsequent day parts. To understand why, recall that the GetTag rule is index-aware. This means that on each iteration of the DataItem's rules, GetTag is trying to obtain that iteration's occurrence of the StartTag and EndTag values. So on the first iteration, the second GetTag rule retrieves the text between first occurrence of and . But on the second iteration that rule tries to retrieve the text between the second occurrence of and . Since there is no second occurrence of and in the DaySource container the rule retrieves nothing.

To achieve what we want, the second rule has to be made a child of the first rule:

</ParsingRule>

Polycom PDS 2000 manual Polycom, Inc 185

Models: PDS 2000

Polycom, Inc.

185