XSLT and XPath are two key technologies used within SahanaPy to allow easy importing and exporting of information in a wide variety of formats. Support for importing and exporting data is mostly managed via XSLT templates.

== Sahana Data Models ==
The underlying data models in {{{models/}}} define the resulting structure that will be within <sahanapy>. More technical detail is [http://trac.sahanapy.org/wiki/S3XRC available here].

== Sahana XSLT Information ==
Sahana XSLT/XPath capability is provided by [http://codespeak.net/lxml/ lxml]. Currently Sahana only supports XSLT/XPath 1.0.

== Sahana XML Representation ==
Here is a simplified blank XML document that highlights the key elements providing in the native XML within SahanaPy.
{{{
<sahanapy>
  <resource name="" uuid="" created_on="" modified_on="" url="">
    <data field=""></data>
    <reference field="" resource="" uuid=""></reference>
  </resource>
</sahanapy>
}}}
 * {{{<resource>}}} - identifies the type of resource e.g. {{{name="hms_hospital"}}}
 * {{{<data>}}} - represents a data field from the model e.g. if a resource is hms_hospital, then the data fields provided will be defined in {{{models/hms.py}}} - look for the resource definition for hospital
 * {{{<reference>}}} - contains information about things such as location e.g. {{{field="location_id" resource="gis_location"}}}

== Exporting Data from Sahana ==
Sahana export templates are stored in: {{{static/xslt/export}}}

== Importing Data from Sahana ==
Sahana import templates are stored in: {{{static/xslt/import}}}

== Background Info and Resources ==
 * [http://www.w3.org/TR/2007/REC-xslt20-20070123/ XSLT V2 reference] on W3C
 * [http://www.w3.org/TR/2007/REC-xpath20-20070123/ XPath V2 reference] on W3C
 * [http://www.w3schools.com/xsl/default.asp XSLT Tutorial] on w3schools
 * [http://www.w3schools.com/xpath/default.asp XPath Tutorial] on w3schools
 * [http://www.w3schools.com/xsl/tryxslt.asp?xmlfile=cdcatalog&xsltfile=cdcatalog interactive xslt environment]