Log4Classicning

OGC Filter定义了一些xml标签，从而实现了查询Feature集合的接口。程序可以将它转换为查询语言，检索Feature集合后返回有效的Feature子集合。

OGC Standard : Filter

Filter : Spatial operators

• Equals
• Disjoint
• Touches
• Within
• Overlaps
• Crosses
• Intersect
• Contains
• DWithin
• Beyond
• BBox

Filter : Comparison operators

• PropertyIsEqualTo
  
  Optional Attribute : matchCase
• PropertyIsNotEqualTo
• PropertyIsLessThan
• PropertyIsGreatThan
• PropertyIsLessThanOrEqualTo
• PropertyIsGreatThanOrEqualTo
• PropertyIsLike
  
  Required Attributes : wildCard, singleChar, escapeChar
  
  Required Elements : PropertyName, Literal
• PropertyIsNull
  
  Required Elements : PropertyName
• PropertyIsBetween
  
  Required Elements : LowerBoundary, UpperBoundary

Filter : Logical operators

• And
• Or
• Not

Filter : Expressions
Arithmetic operators

<Add>
<Sub>
<Mul>
<Div>
<PropertyName>
<Literal>
<Function>


Filter Examples
Function:

<Filter> 
   <PropertyIsEqualTo> 
      <Function name="SIN"> 
          <PropertyName>DISPERSION_ANGLE</PropertyName> 
      </Function> 
      <Literal>1</Literal> 
   </PropertyIsEqualTo> 
</Filter> 


Add:

<Filter> 
   <PropertyIsEqualTo> 
      <PropertyName>PROPA</PropertyName> 
      <Add> 
          <PropertyName>PROPB</PropertyName> 
          <Literal>100</Literal> 
      </Add> 
   </PropertyIsEqualTo> 
</Filter> 


PropertyIsBetween:

<Filter> 
   <PropertyIsBetween> 
      <PropertyName>DEPTH</PropertyName> 
      <LowerBoundary><Literal>100</Literal></LowerBoundary> 
      <UpperBoundary><Literal>200</Literal></UpperBoundary> 
   </PropertyIsBetween> 
</Filter> 


PropertyIsLike:

<Filter> 
   <PropertyIsLike wildCard="*" singleChar="#" escapeChar="!"> 
      <PropertyName>LAST_NAME</PropertyName> 
      <Literal>JOHN*</Literal> 
   </PropertyIsLike> 
</Filter>