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Polycom Digital Signage Administrator Guide Data Source Definition File Overview
174 Polycom, Inc.
• Result specifies the name of the container that should receive the output
of the pasring rule. Ultimately, parsing rule results need to be placed into
the data table fields defined in the <TableStructure> element, and so the
names of the data table fields are valid values for the Result attribute.
Other containers can also be created simply by naming them in a Result
attribute. Any container named in a Result attribute, including data table
fields, can be used as a Source in later <ParsingRule> elements.
If a Result attribute names an existing container, the container's contents
are replaced with the output of the parsing rule.
• Source specifies the input text for the parsing rule. This can be either the
original data feed or a container named in the Result attribute of a
previous <ParsingRule> element. A special container named "Source"
holds the original text obtained from the data source's URL. The contents
of the "Source" container can be replaced by naming it in a Result attribute,
just like any other container.
Definitions for all supported parsing rules are in the Parsing Rule Reference
Guide at the end of this appendix.
Some parsing rules can work with an <Index> parameter. These are rules that
extract a value from their Source container. The <Index> parameter identifies
which occurrence of a value to extract. See the Reference Guide for more
information relating to specific parsing rules. These "index-aware" rules are
also used when processing <DataItem> elements (see below).
Some parsing rules support a special "tag" syntax for some or all of their
parameters. These are identified as "taggable" in the Parsing Rule Reference
Guide. The "tag" syntax provides two features:
• Special character handling: The following string codes are replaced with
specific character sequences:
— <cr> is replaced with a carriage return character (ASCII code 13)
— <lf> is replaced with a line feed character (ASCII code 10)
— <crlf> is replaced with a carriage return (ASCII code 13) followed by
a line feed (ASCII code 10). (This is the equivalent of using "<cr><lf>".)
— <tab> is replaced with a tab character (ASCII code 9)
— <space> is replaced with a space character (ASCII code 32)
• Container substitution: If a string between | characters is the name of an
existing text container, the contents of the container replace the string and
its | delimiters. For example, if a taggable parameter is "This is
|SomeResult|" and there's a container named SomeResult that contains
the text "awesome" then the parameter's value will be treated as "This is
awesome".
Here are some simple examples of <ParsingRule> elements. The following
parsing rule replaces all occurrences of "Football" in the original text of the
data feed with "Baseball" and saves the result in a container named NewSport.
<ParsingRule Type="Replace" Source="Source" Result="NewSport">