Standard XML Representations of Field Data

This would create a standard way of representing form field data safely as structured xml. It would be used by the custom reporting module whenever export as XML is chosen. This would be added for version 4.1 of I2CE/iHRIS.

Justification Currently the reporting system for iHRIS exports data in XML in an unsafe way, namely it just dumps out the database value. For the currently limited uses of XML report this has not been too problematic. However there are some issues that need to be resolved so that XML based report exports can be more readily implemented and fully utilized. These issues include:

potential for exported data to itself can xml data which would make the xml export invalid
inability to export binary data (such as PDF files or photos) in a readable format
XSLT manipulation of structured data (such a mapped fields) is painful and ugly and prone to breakage as it can only the simple string manipulation functions available.

Note This will break existing XSLT transforms of exported XML data. In particular of the transforms used by Kenya and Zanzibar would need to be updated before they upgrade to 4.1 of iHRIS. This is intentional as we would now be able to use xpath queries to get at the needed data rather than perform string manipulations.

Requirements

Experience in creating new forms in iHRIS
Experience in object oriented PHP
Experience with XML

Deliverables

Fully functional, documented, and tested code that implements the code requirements as defined below.
Updates to the XSLT transforms used by Kenya and Zanzibar for SDMX-HD

API

I2CE_FormField

add in a (final) method getXMLData($as_node = false). Calls _getXMLData(). If $as_node == false, the simply pass it along. If $as_node == true, first convert it to a DOMNode and return that
add in a abstract method _getXMLData() which return strings

Sub-Classes of I2CE_FormField

each non-abstract class should implement _getXMLData()

XML Format

Each _getXMLData() should return a string that looks like <field type='XXX'>YYYY<field> where XXX is the form field type such as MAP, STRING, DATE_YMD, etc and YYY is as defined below

I2CE_FormField_BINARY_FILE

I2CE_FormField_DOCUMENT

I2CE_FormField_IMAGE

I2CE_FormField_ASSOC_FLOAT

Same as ASSOC_INT but with type='ASSOC_FLOAT'

I2CE_FormField_ASSOC_INT

<field type='ASSOC_INT'><value key='$key0' >$value[$key0]<value>...<value key='$keyn'>$value[$keyn]</value></field> where key0...keyn runs through the array keys

I2CE_FormField_ASSOC_LIST

<field type='ASSOC_INT'><value key='$key0' >$string_value[$key0]<value>...<value key='$keyn'>$string_value[$keyn]</value></field> where key0...keyn runs through the array keys. Here $string_value should follow the same rules is as in #I2CE_FormField_STRING_LINE adding in the attribute encode='base64' as needed

I2CE_FormField_ASSOC_PERCENT

Same as ASSOC_INT but with type='ASSOC_PERCENT'

I2CE_FormField_BOOL

I2CE_FormField_DATE_HMS

I2CE_FormField_DATE_MD

I2CE_FormField_DATE_TIME

I2CE_FormField_DATE_Y

I2CE_FormField_DATE_YMD

I2CE_FormField_INT

<field type='INT'>$value</field>

I2CE_FormField_INT_GENERATE

I2CE_FormField_INT_LIST

<field type='INT_LIST'><value>$value[0]<value>...<value>$value[n]</value></field> where 0...n runs through the array keys

I2CE_FormField_INT_RANGE

<field type='INT_RANGE'>$value</field>

I2CE_FormField_STRING_LINE

<field type='STRING'>YYYY</field> where YYYY is:

If the string is less than 1000 characters
- If the string does not contain a "<" character, then YYYY = <value>$value</value>
- If the string contains as "<", then follow the rules for >= 1000 characters
If the string is >= 1000 characters:
- If the $value contains CDATA a string, then YYYY= <value encoding='base64'>base64($value)</value>
- If the $value does not contains "CDATA" then YYYY= <value><![CDATA[$value]]><value>

I2CE_FormField_STRING_MLINE

same as STRING_LINE but with the type='STRING_MLINE'

I2CE_FormField_STRING_PASS

I2CE_FormField_STRING_TEXT

same as STRING_LINE but with the type='STRING_TEXT'

I2CE_FormField_TOGGLE

same as YESNO but with the type='TOGGLE'

I2CE_FormField_YESNO

if $value == 1 then <field type='YESNO'>1</value>
otherwise<field type='YESNO'>0</value>

I2CE_FormField_PERCENT_INT