<p:pipe xmlns:p="urn:publicid:IDN+smallx.com:pipeline:1.0" name="tideinfo"
   xmlns:c="urn:publicid:IDN+smallx.com:component-language:1.0"
   xmlns:f="urn:publicid:IDN+smallx.com:server:forms:post:1.0"
   xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
   xmlns:h="http://www.w3.org/1999/xhtml"
   xmlns:t="http://www.smallx.com/services/tideinfo/2005"
   xmlns:date="http://exslt.org/dates-and-times"
>

<p:documentation>
<h:p>This pipeline takes a [t:]tideinfo element in the
http://www.smallx.com/services/tideinfo/2005 namespace.  The location
is attribute of this element specifies a postal zipcode like number as
specified by the NOOA website http://tidesonline.nos.noaa.gov/geographic.html</h:p>
<h:p>The return is a set of tide data for the day requested and the
high and low tide times.</h:p>
<h:p>Any other element other than the [t:]tideinfo element will be
ignored and repeated back to the requestor.</h:p>
</p:documentation>


<p:subtree select="t:tideinfo">

<p:documentation>
<h:p>Add today's date to the request.</h:p>
</p:documentation>

<p:template>
  <xsl:for-each select="t:tideinfo">
  <xsl:copy>
    <xsl:attribute name="today"><xsl:value-of select="date:date()"/></xsl:attribute>
    <xsl:copy-of select="@*|node()"/>
  </xsl:copy>
  </xsl:for-each>
</p:template>

<p:documentation>
<h:p>Get the tide data from the NOOA website.</h:p>
</p:documentation>

<p:pipeline src="gettides.pd"/>

<p:documentation>
<h:p>Remove every other day other than today.</h:p>
</p:documentation>

<p:xslt>
  <xsl:transform version="1.0">
  
  <xsl:variable name="today" select="string(/t:tideinfo/@today)"/>
  
  <xsl:template match="t:tide-data">
  <xsl:copy>
     <xsl:apply-templates select="*"/>
  </xsl:copy>
  </xsl:template>
  
  <xsl:template match="t:tide-level[@date!=$today]"/>
  <xsl:template match="t:tide-level">
  <xsl:copy>
     <xsl:apply-templates select="@*|node()"/>
  </xsl:copy>
<xsl:text>
</xsl:text>
  </xsl:template>
  
  <xsl:template match="@*|*">
  <xsl:copy>
     <xsl:apply-templates select="@*|node()"/>
  </xsl:copy>
  </xsl:template>

  </xsl:transform>
</p:xslt>

<p:documentation>
<h:p>Get the high and low tide times from the data.</h:p>
</p:documentation>

<p:xslt>
  <xsl:transform version="1.0">

  <xsl:template match="t:tideinfo">
  <xsl:variable name="today" select="string(@today)"/>
  <xsl:copy>
    <xsl:attribute name="low-at">
       <xsl:for-each select="t:tide-data/t:tide-level" mode="first">
          <xsl:sort data-type="number" order="ascending" select="@level"/>
          <xsl:if test="position()=1">
          <xsl:value-of select="@time"/>
          </xsl:if>
       </xsl:for-each>
    </xsl:attribute>
    <xsl:attribute name="high-at">
       <xsl:for-each select="t:tide-data/t:tide-level" mode="first">
          <xsl:sort data-type="number" order="descending" select="@level"/>
          <xsl:if test="position()=1">
          <xsl:value-of select="@time"/>
          </xsl:if>
       </xsl:for-each>
    </xsl:attribute>
    <xsl:copy-of select="@*|node()"/>
  </xsl:copy>
  </xsl:template>

  <xsl:template match="t:tide-level[1]" mode="first">
  <xsl:value-of select="@time"/>
  </xsl:template>
  
  <xsl:template match="t:tide-level" mode="first"/>
  
  </xsl:transform>
</p:xslt>

</p:subtree>

</p:pipe>