This page represents the current plan; for discussion please check the tracker link above.

Description

The CQL format has a couple of limitiations we need to break free of:

• propertyName OP expression
• there is no support for FeatureId filters

This proposal will create a new query language (called TXT) that looks like CQL but offers support for the above two ideas. We would call it WKT but since we are making up is is not yet known.

Status

This proposal is under construction.

Voting has not started yet:

• aaime
• Ian Turton
• Justin Deoliveira
• jgarnett
• Martin Desruisseaux
• Simone Giannecchini

Tasks

This section is used to make sure your proposal is complete (did you remember documentation?) and has enough paid or volunteer time lined up to be a success

	no progress		done		impeded		lack mandate/funds/time		volunteer needed

status	description
	Define the BNF for TXT based on the CQL origional (see TXT Language Analysis)
	Code refactoring in CQLCopiler class to separate the generated parser from filter builder logic
	Create a TXT facade class that is method compatible with CQL
	Develop ID predicate and Comparison predicate
	Develop Between predicate
	Develop Null predicate
	Develop IN predicate
	Develop like spatial-relation predicate
	Update the user guide to present TXT as a non standard option.

API Changes

TXT Facade Class

class TXT {
    String toTXT( Expression );
    String toTXT( Filter );
    Expression toExpression( String );
    Expression toExpression( String, FilterFactory );
    Filter toFilter( String );
    Filter toFilter( String, FilterFactory );
    List<Filter> toFilterList(String);
    List<Filter> toFilterList(String,FilterFactory);
}

Documentation Changes

list the pages effected by this proposal

• CQL Parser from the Module Matrix page
• Home
• TXT Language Analysis

Resources